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FFmpeg/libavcodec/utils.c

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  1. /*

  2.  * utils for libavcodec

  3.  * Copyright (c) 2001 Fabrice Bellard

  4.  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * This file is part of Libav.

  7.  *

  8.  * Libav is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * Libav is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with Libav; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * utils.

  26.  */

  27. 

  28. #include "config.h"

  29. #include "libavutil/attributes.h"

  30. #include "libavutil/avassert.h"

  31. #include "libavutil/avstring.h"

  32. #include "libavutil/channel_layout.h"

  33. #include "libavutil/crc.h"

  34. #include "libavutil/frame.h"

  35. #include "libavutil/hwcontext.h"

  36. #include "libavutil/internal.h"

  37. #include "libavutil/mathematics.h"

  38. #include "libavutil/pixdesc.h"

  39. #include "libavutil/imgutils.h"

  40. #include "libavutil/samplefmt.h"

  41. #include "libavutil/dict.h"

  42. #include "avcodec.h"

  43. #include "decode.h"

  44. #include "libavutil/opt.h"

  45. #include "me_cmp.h"

  46. #include "mpegvideo.h"

  47. #include "thread.h"

  48. #include "internal.h"

  49. #include "bytestream.h"

  50. #include "version.h"

  51. #include <stdlib.h>

  52. #include <stdarg.h>

  53. #include <limits.h>

  54. #include <float.h>

  55. 

  56. static int volatile entangled_thread_counter = 0;

  57. static int (*lockmgr_cb)(void **mutex, enum AVLockOp op);

  58. static void *codec_mutex;

  59. static void *avformat_mutex;

  60. 

  61. void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)

  62. {

  63.     void **p = ptr;

  64.     if (min_size > SIZE_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {

  65.         av_freep(p);

  66.         *size = 0;

  67.         return;

  68.     }

  69.     av_fast_malloc(p, size, min_size + AV_INPUT_BUFFER_PADDING_SIZE);

  70.     if (*size)

  71.         memset((uint8_t *)*p + min_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);

  72. }

  73. 

  74. /* encoder management */

  75. static AVCodec *first_avcodec = NULL;

  76. 

  77. AVCodec *av_codec_next(const AVCodec *c)

  78. {

  79.     if (c)

  80.         return c->next;

  81.     else

  82.         return first_avcodec;

  83. }

  84. 

  85. static av_cold void avcodec_init(void)

  86. {

  87.     static int initialized = 0;

  88. 

  89.     if (initialized != 0)

  90.         return;

  91.     initialized = 1;

  92. 

  93.     if (CONFIG_ME_CMP)

  94.         ff_me_cmp_init_static();

  95. }

  96. 

  97. int av_codec_is_encoder(const AVCodec *codec)

  98. {

  99.     return codec && (codec->encode_sub || codec->encode2 ||codec->send_frame);

  100. }

  101. 

  102. int av_codec_is_decoder(const AVCodec *codec)

  103. {

  104.     return codec && (codec->decode || codec->receive_frame);

  105. }

  106. 

  107. av_cold void avcodec_register(AVCodec *codec)

  108. {

  109.     AVCodec **p;

  110.     avcodec_init();

  111.     p = &first_avcodec;

  112.     while (*p)

  113.         p = &(*p)->next;

  114.     *p          = codec;

  115.     codec->next = NULL;

  116. 

  117.     if (codec->init_static_data)

  118.         codec->init_static_data(codec);

  119. }

  120. 

  121. int ff_set_dimensions(AVCodecContext *s, int width, int height)

  122. {

  123.     int ret = av_image_check_size(width, height, 0, s);

  124. 

  125.     if (ret < 0)

  126.         width = height = 0;

  127.     s->width  = s->coded_width  = width;

  128.     s->height = s->coded_height = height;

  129. 

  130.     return ret;

  131. }

  132. 

  133. int ff_set_sar(AVCodecContext *avctx, AVRational sar)

  134. {

  135.     int ret = av_image_check_sar(avctx->width, avctx->height, sar);

  136. 

  137.     if (ret < 0) {

  138.         av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %d/%d\n",

  139.                sar.num, sar.den);

  140.         avctx->sample_aspect_ratio = (AVRational){ 0, 1 };

  141.         return ret;

  142.     } else {

  143.         avctx->sample_aspect_ratio = sar;

  144.     }

  145.     return 0;

  146. }

  147. 

  148. int ff_side_data_update_matrix_encoding(AVFrame *frame,

  149.                                         enum AVMatrixEncoding matrix_encoding)

  150. {

  151.     AVFrameSideData *side_data;

  152.     enum AVMatrixEncoding *data;

  153. 

  154.     side_data = av_frame_get_side_data(frame, AV_FRAME_DATA_MATRIXENCODING);

  155.     if (!side_data)

  156.         side_data = av_frame_new_side_data(frame, AV_FRAME_DATA_MATRIXENCODING,

  157.                                            sizeof(enum AVMatrixEncoding));

  158. 

  159.     if (!side_data)

  160.         return AVERROR(ENOMEM);

  161. 

  162.     data  = (enum AVMatrixEncoding*)side_data->data;

  163.     *data = matrix_encoding;

  164. 

  165.     return 0;

  166. }

  167. 

  168. void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,

  169.                                int linesize_align[AV_NUM_DATA_POINTERS])

  170. {

  171.     size_t max_align = av_cpu_max_align();

  172.     int i;

  173.     int w_align = 1;

  174.     int h_align = 1;

  175. 

  176.     switch (s->pix_fmt) {

  177.     case AV_PIX_FMT_YUV420P:

  178.     case AV_PIX_FMT_YUYV422:

  179.     case AV_PIX_FMT_YVYU422:

  180.     case AV_PIX_FMT_UYVY422:

  181.     case AV_PIX_FMT_YUV422P:

  182.     case AV_PIX_FMT_YUV440P:

  183.     case AV_PIX_FMT_YUV444P:

  184.     case AV_PIX_FMT_GBRP:

  185.     case AV_PIX_FMT_GBRAP:

  186.     case AV_PIX_FMT_GRAY8:

  187.     case AV_PIX_FMT_GRAY16BE:

  188.     case AV_PIX_FMT_GRAY16LE:

  189.     case AV_PIX_FMT_YUVJ420P:

  190.     case AV_PIX_FMT_YUVJ422P:

  191.     case AV_PIX_FMT_YUVJ440P:

  192.     case AV_PIX_FMT_YUVJ444P:

  193.     case AV_PIX_FMT_YUVA420P:

  194.     case AV_PIX_FMT_YUVA422P:

  195.     case AV_PIX_FMT_YUVA444P:

  196.     case AV_PIX_FMT_YUV420P9LE:

  197.     case AV_PIX_FMT_YUV420P9BE:

  198.     case AV_PIX_FMT_YUV420P10LE:

  199.     case AV_PIX_FMT_YUV420P10BE:

  200.     case AV_PIX_FMT_YUV422P9LE:

  201.     case AV_PIX_FMT_YUV422P9BE:

  202.     case AV_PIX_FMT_YUV422P10LE:

  203.     case AV_PIX_FMT_YUV422P10BE:

  204.     case AV_PIX_FMT_YUVA422P10LE:

  205.     case AV_PIX_FMT_YUVA422P10BE:

  206.     case AV_PIX_FMT_YUV444P9LE:

  207.     case AV_PIX_FMT_YUV444P9BE:

  208.     case AV_PIX_FMT_YUV444P10LE:

  209.     case AV_PIX_FMT_YUV444P10BE:

  210.     case AV_PIX_FMT_YUVA444P10LE:

  211.     case AV_PIX_FMT_YUVA444P10BE:

  212.     case AV_PIX_FMT_GBRP9LE:

  213.     case AV_PIX_FMT_GBRP9BE:

  214.     case AV_PIX_FMT_GBRP10LE:

  215.     case AV_PIX_FMT_GBRP10BE:

  216.     case AV_PIX_FMT_GBRAP12LE:

  217.     case AV_PIX_FMT_GBRAP12BE:

  218.         w_align = 16; //FIXME assume 16 pixel per macroblock

  219.         h_align = 16 * 2; // interlaced needs 2 macroblocks height

  220.         break;

  221.     case AV_PIX_FMT_YUV411P:

  222.     case AV_PIX_FMT_UYYVYY411:

  223.         w_align = 32;

  224.         h_align = 8;

  225.         break;

  226.     case AV_PIX_FMT_YUV410P:

  227.         if (s->codec_id == AV_CODEC_ID_SVQ1) {

  228.             w_align = 64;

  229.             h_align = 64;

  230.         }

  231.     case AV_PIX_FMT_RGB555:

  232.         if (s->codec_id == AV_CODEC_ID_RPZA) {

  233.             w_align = 4;

  234.             h_align = 4;

  235.         }

  236.     case AV_PIX_FMT_PAL8:

  237.     case AV_PIX_FMT_BGR8:

  238.     case AV_PIX_FMT_RGB8:

  239.         if (s->codec_id == AV_CODEC_ID_SMC) {

  240.             w_align = 4;

  241.             h_align = 4;

  242.         }

  243.         break;

  244.     case AV_PIX_FMT_BGR24:

  245.         if ((s->codec_id == AV_CODEC_ID_MSZH) ||

  246.             (s->codec_id == AV_CODEC_ID_ZLIB)) {

  247.             w_align = 4;

  248.             h_align = 4;

  249.         }

  250.         break;

  251.     default:

  252.         w_align = 1;

  253.         h_align = 1;

  254.         break;

  255.     }

  256. 

  257.     *width  = FFALIGN(*width, w_align);

  258.     *height = FFALIGN(*height, h_align);

  259.     if (s->codec_id == AV_CODEC_ID_H264)

  260.         // some of the optimized chroma MC reads one line too much

  261.         *height += 2;

  262. 

  263.     for (i = 0; i < 4; i++)

  264.         linesize_align[i] = max_align;

  265. }

  266. 

  267. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)

  268. {

  269.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);

  270.     int chroma_shift = desc->log2_chroma_w;

  271.     int linesize_align[AV_NUM_DATA_POINTERS];

  272.     int align;

  273. 

  274.     avcodec_align_dimensions2(s, width, height, linesize_align);

  275.     align               = FFMAX(linesize_align[0], linesize_align[3]);

  276.     linesize_align[1] <<= chroma_shift;

  277.     linesize_align[2] <<= chroma_shift;

  278.     align               = FFMAX3(align, linesize_align[1], linesize_align[2]);

  279.     *width              = FFALIGN(*width, align);

  280. }

  281. 

  282. int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,

  283.                              enum AVSampleFormat sample_fmt, const uint8_t *buf,

  284.                              int buf_size, int align)

  285. {

  286.     int ch, planar, needed_size, ret = 0;

  287. 

  288.     needed_size = av_samples_get_buffer_size(NULL, nb_channels,

  289.                                              frame->nb_samples, sample_fmt,

  290.                                              align);

  291.     if (buf_size < needed_size)

  292.         return AVERROR(EINVAL);

  293. 

  294.     planar = av_sample_fmt_is_planar(sample_fmt);

  295.     if (planar && nb_channels > AV_NUM_DATA_POINTERS) {

  296.         if (!(frame->extended_data = av_mallocz(nb_channels *

  297.                                                 sizeof(*frame->extended_data))))

  298.             return AVERROR(ENOMEM);

  299.     } else {

  300.         frame->extended_data = frame->data;

  301.     }

  302. 

  303.     if ((ret = av_samples_fill_arrays(frame->extended_data, &frame->linesize[0],

  304.                                       buf, nb_channels, frame->nb_samples,

  305.                                       sample_fmt, align)) < 0) {

  306.         if (frame->extended_data != frame->data)

  307.             av_free(frame->extended_data);

  308.         return ret;

  309.     }

  310.     if (frame->extended_data != frame->data) {

  311.         for (ch = 0; ch < AV_NUM_DATA_POINTERS; ch++)

  312.             frame->data[ch] = frame->extended_data[ch];

  313.     }

  314. 

  315.     return ret;

  316. }

  317. 

  318. int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)

  319. {

  320.     int i;

  321. 

  322.     for (i = 0; i < count; i++) {

  323.         int r = func(c, (char *)arg + i * size);

  324.         if (ret)

  325.             ret[i] = r;

  326.     }

  327.     return 0;

  328. }

  329. 

  330. int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr), void *arg, int *ret, int count)

  331. {

  332.     int i;

  333. 

  334.     for (i = 0; i < count; i++) {

  335.         int r = func(c, arg, i, 0);

  336.         if (ret)

  337.             ret[i] = r;

  338.     }

  339.     return 0;

  340. }

  341. 

  342. int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)

  343. {

  344.     int ret = 0;

  345.     AVDictionary *tmp = NULL;

  346. 

  347.     if (avcodec_is_open(avctx))

  348.         return 0;

  349. 

  350.     if ((!codec && !avctx->codec)) {

  351.         av_log(avctx, AV_LOG_ERROR, "No codec provided to avcodec_open2().\n");

  352.         return AVERROR(EINVAL);

  353.     }

  354.     if ((codec && avctx->codec && codec != avctx->codec)) {

  355.         av_log(avctx, AV_LOG_ERROR, "This AVCodecContext was allocated for %s, "

  356.                                     "but %s passed to avcodec_open2().\n", avctx->codec->name, codec->name);

  357.         return AVERROR(EINVAL);

  358.     }

  359.     if (!codec)

  360.         codec = avctx->codec;

  361. 

  362.     if (avctx->extradata_size < 0 || avctx->extradata_size >= FF_MAX_EXTRADATA_SIZE)

  363.         return AVERROR(EINVAL);

  364. 

  365.     if (options)

  366.         av_dict_copy(&tmp, *options, 0);

  367. 

  368.     /* If there is a user-supplied mutex locking routine, call it. */

  369.     if (!(codec->caps_internal & FF_CODEC_CAP_INIT_THREADSAFE) && codec->init) {

  370.         if (lockmgr_cb) {

  371.             if ((*lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))

  372.                 return -1;

  373.         }

  374. 

  375.         entangled_thread_counter++;

  376.         if (entangled_thread_counter != 1) {

  377.             av_log(avctx, AV_LOG_ERROR,

  378.                    "Insufficient thread locking. At least %d threads are "

  379.                    "calling avcodec_open2() at the same time right now.\n",

  380.                    entangled_thread_counter);

  381.             ret = -1;

  382.             goto end;

  383.         }

  384.     }

  385. 

  386.     avctx->internal = av_mallocz(sizeof(AVCodecInternal));

  387.     if (!avctx->internal) {

  388.         ret = AVERROR(ENOMEM);

  389.         goto end;

  390.     }

  391. 

  392.     avctx->internal->pool = av_mallocz(sizeof(*avctx->internal->pool));

  393.     if (!avctx->internal->pool) {

  394.         ret = AVERROR(ENOMEM);

  395.         goto free_and_end;

  396.     }

  397. 

  398.     avctx->internal->to_free = av_frame_alloc();

  399.     if (!avctx->internal->to_free) {

  400.         ret = AVERROR(ENOMEM);

  401.         goto free_and_end;

  402.     }

  403. 

  404.     avctx->internal->compat_decode_frame = av_frame_alloc();

  405.     if (!avctx->internal->compat_decode_frame) {

  406.         ret = AVERROR(ENOMEM);

  407.         goto free_and_end;

  408.     }

  409. 

  410.     avctx->internal->buffer_frame = av_frame_alloc();

  411.     if (!avctx->internal->buffer_frame) {

  412.         ret = AVERROR(ENOMEM);

  413.         goto free_and_end;

  414.     }

  415. 

  416.     avctx->internal->buffer_pkt = av_packet_alloc();

  417.     if (!avctx->internal->buffer_pkt) {

  418.         ret = AVERROR(ENOMEM);

  419.         goto free_and_end;

  420.     }

  421. 

  422.     avctx->internal->ds.in_pkt = av_packet_alloc();

  423.     if (!avctx->internal->ds.in_pkt) {

  424.         ret = AVERROR(ENOMEM);

  425.         goto free_and_end;

  426.     }

  427. 

  428.     avctx->internal->last_pkt_props = av_packet_alloc();

  429.     if (!avctx->internal->last_pkt_props) {

  430.         ret = AVERROR(ENOMEM);

  431.         goto free_and_end;

  432.     }

  433. 

  434.     if (codec->priv_data_size > 0) {

  435.         if (!avctx->priv_data) {

  436.             avctx->priv_data = av_mallocz(codec->priv_data_size);

  437.             if (!avctx->priv_data) {

  438.                 ret = AVERROR(ENOMEM);

  439.                 goto end;

  440.             }

  441.             if (codec->priv_class) {

  442.                 *(const AVClass **)avctx->priv_data = codec->priv_class;

  443.                 av_opt_set_defaults(avctx->priv_data);

  444.             }

  445.         }

  446.         if (codec->priv_class && (ret = av_opt_set_dict(avctx->priv_data, &tmp)) < 0)

  447.             goto free_and_end;

  448.     } else {

  449.         avctx->priv_data = NULL;

  450.     }

  451.     if ((ret = av_opt_set_dict(avctx, &tmp)) < 0)

  452.         goto free_and_end;

  453. 

  454.     if (avctx->coded_width && avctx->coded_height && !avctx->width && !avctx->height)

  455.         ret = ff_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);

  456.     else if (avctx->width && avctx->height)

  457.         ret = ff_set_dimensions(avctx, avctx->width, avctx->height);

  458.     if (ret < 0)

  459.         goto free_and_end;

  460. 

  461.     if ((avctx->coded_width || avctx->coded_height || avctx->width || avctx->height)

  462.         && (  av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx) < 0

  463.            || av_image_check_size(avctx->width,       avctx->height,       0, avctx) < 0)) {

  464.         av_log(avctx, AV_LOG_WARNING, "ignoring invalid width/height values\n");

  465.         ff_set_dimensions(avctx, 0, 0);

  466.     }

  467. 

  468.     if (avctx->width > 0 && avctx->height > 0) {

  469.         if (av_image_check_sar(avctx->width, avctx->height,

  470.                                avctx->sample_aspect_ratio) < 0) {

  471.             av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",

  472.                    avctx->sample_aspect_ratio.num,

  473.                    avctx->sample_aspect_ratio.den);

  474.             avctx->sample_aspect_ratio = (AVRational){ 0, 1 };

  475.         }

  476.     }

  477. 

  478.     /* if the decoder init function was already called previously,

  479.      * free the already allocated subtitle_header before overwriting it */

  480.     if (av_codec_is_decoder(codec))

  481.         av_freep(&avctx->subtitle_header);

  482. 

  483.     if (avctx->channels > FF_SANE_NB_CHANNELS) {

  484.         ret = AVERROR(EINVAL);

  485.         goto free_and_end;

  486.     }

  487. 

  488.     avctx->codec = codec;

  489.     if ((avctx->codec_type == AVMEDIA_TYPE_UNKNOWN || avctx->codec_type == codec->type) &&

  490.         avctx->codec_id == AV_CODEC_ID_NONE) {

  491.         avctx->codec_type = codec->type;

  492.         avctx->codec_id   = codec->id;

  493.     }

  494.     if (avctx->codec_id != codec->id || (avctx->codec_type != codec->type

  495.                                          && avctx->codec_type != AVMEDIA_TYPE_ATTACHMENT)) {

  496.         av_log(avctx, AV_LOG_ERROR, "codec type or id mismatches\n");

  497.         ret = AVERROR(EINVAL);

  498.         goto free_and_end;

  499.     }

  500.     avctx->frame_number = 0;

  501. 

  502.     if ((avctx->codec->capabilities & AV_CODEC_CAP_EXPERIMENTAL) &&

  503.         avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {

  504.         ret = AVERROR_EXPERIMENTAL;

  505.         goto free_and_end;

  506.     }

  507. 

  508.     if (avctx->codec_type == AVMEDIA_TYPE_AUDIO &&

  509.         (!avctx->time_base.num || !avctx->time_base.den)) {

  510.         avctx->time_base.num = 1;

  511.         avctx->time_base.den = avctx->sample_rate;

  512.     }

  513. 

  514.     if (HAVE_THREADS) {

  515.         ret = ff_thread_init(avctx);

  516.         if (ret < 0) {

  517.             goto free_and_end;

  518.         }

  519.     }

  520.     if (!HAVE_THREADS && !(codec->capabilities & AV_CODEC_CAP_AUTO_THREADS))

  521.         avctx->thread_count = 1;

  522. 

  523.     if (av_codec_is_encoder(avctx->codec)) {

  524.         int i;

  525. #if FF_API_CODED_FRAME

  526. FF_DISABLE_DEPRECATION_WARNINGS

  527.         avctx->coded_frame = av_frame_alloc();

  528.         if (!avctx->coded_frame) {

  529.             ret = AVERROR(ENOMEM);

  530.             goto free_and_end;

  531.         }

  532. FF_ENABLE_DEPRECATION_WARNINGS

  533. #endif

  534. 

  535.         if (avctx->time_base.num <= 0 || avctx->time_base.den <= 0) {

  536.             av_log(avctx, AV_LOG_ERROR, "The encoder timebase is not set.\n");

  537.             ret = AVERROR(EINVAL);

  538.             goto free_and_end;

  539.         }

  540. 

  541.         if (avctx->codec->sample_fmts) {

  542.             for (i = 0; avctx->codec->sample_fmts[i] != AV_SAMPLE_FMT_NONE; i++) {

  543.                 if (avctx->sample_fmt == avctx->codec->sample_fmts[i])

  544.                     break;

  545.                 if (avctx->channels == 1 &&

  546.                     av_get_planar_sample_fmt(avctx->sample_fmt) ==

  547.                     av_get_planar_sample_fmt(avctx->codec->sample_fmts[i])) {

  548.                     avctx->sample_fmt = avctx->codec->sample_fmts[i];

  549.                     break;

  550.                 }

  551.             }

  552.             if (avctx->codec->sample_fmts[i] == AV_SAMPLE_FMT_NONE) {

  553.                 av_log(avctx, AV_LOG_ERROR, "Specified sample_fmt is not supported.\n");

  554.                 ret = AVERROR(EINVAL);

  555.                 goto free_and_end;

  556.             }

  557.         }

  558.         if (avctx->codec->pix_fmts) {

  559.             for (i = 0; avctx->codec->pix_fmts[i] != AV_PIX_FMT_NONE; i++)

  560.                 if (avctx->pix_fmt == avctx->codec->pix_fmts[i])

  561.                     break;

  562.             if (avctx->codec->pix_fmts[i] == AV_PIX_FMT_NONE) {

  563.                 av_log(avctx, AV_LOG_ERROR, "Specified pix_fmt is not supported\n");

  564.                 ret = AVERROR(EINVAL);

  565.                 goto free_and_end;

  566.             }

  567.             if (avctx->codec->pix_fmts[i] == AV_PIX_FMT_YUVJ420P ||

  568.                 avctx->codec->pix_fmts[i] == AV_PIX_FMT_YUVJ422P ||

  569.                 avctx->codec->pix_fmts[i] == AV_PIX_FMT_YUVJ440P ||

  570.                 avctx->codec->pix_fmts[i] == AV_PIX_FMT_YUVJ444P)

  571.                 avctx->color_range = AVCOL_RANGE_JPEG;

  572.         }

  573.         if (avctx->codec->supported_samplerates) {

  574.             for (i = 0; avctx->codec->supported_samplerates[i] != 0; i++)

  575.                 if (avctx->sample_rate == avctx->codec->supported_samplerates[i])

  576.                     break;

  577.             if (avctx->codec->supported_samplerates[i] == 0) {

  578.                 av_log(avctx, AV_LOG_ERROR, "Specified sample_rate is not supported\n");

  579.                 ret = AVERROR(EINVAL);

  580.                 goto free_and_end;

  581.             }

  582.         }

  583.         if (avctx->codec->channel_layouts) {

  584.             if (!avctx->channel_layout) {

  585.                 av_log(avctx, AV_LOG_WARNING, "channel_layout not specified\n");

  586.             } else {

  587.                 for (i = 0; avctx->codec->channel_layouts[i] != 0; i++)

  588.                     if (avctx->channel_layout == avctx->codec->channel_layouts[i])

  589.                         break;

  590.                 if (avctx->codec->channel_layouts[i] == 0) {

  591.                     av_log(avctx, AV_LOG_ERROR, "Specified channel_layout is not supported\n");

  592.                     ret = AVERROR(EINVAL);

  593.                     goto free_and_end;

  594.                 }

  595.             }

  596.         }

  597.         if (avctx->channel_layout && avctx->channels) {

  598.             if (av_get_channel_layout_nb_channels(avctx->channel_layout) != avctx->channels) {

  599.                 av_log(avctx, AV_LOG_ERROR, "channel layout does not match number of channels\n");

  600.                 ret = AVERROR(EINVAL);

  601.                 goto free_and_end;

  602.             }

  603.         } else if (avctx->channel_layout) {

  604.             avctx->channels = av_get_channel_layout_nb_channels(avctx->channel_layout);

  605.         }

  606. 

  607.         if (!avctx->rc_initial_buffer_occupancy)

  608.             avctx->rc_initial_buffer_occupancy = avctx->rc_buffer_size * 3 / 4;

  609. 

  610.         if (avctx->ticks_per_frame &&

  611.             avctx->ticks_per_frame > INT_MAX / avctx->time_base.num) {

  612.             av_log(avctx, AV_LOG_ERROR,

  613.                    "ticks_per_frame %d too large for the timebase %d/%d.",

  614.                    avctx->ticks_per_frame,

  615.                    avctx->time_base.num,

  616.                    avctx->time_base.den);

  617.             goto free_and_end;

  618.         }

  619. 

  620.         if (avctx->hw_frames_ctx) {

  621.             AVHWFramesContext *frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;

  622.             if (frames_ctx->format != avctx->pix_fmt) {

  623.                 av_log(avctx, AV_LOG_ERROR,

  624.                        "Mismatching AVCodecContext.pix_fmt and AVHWFramesContext.format\n");

  625.                 ret = AVERROR(EINVAL);

  626.                 goto free_and_end;

  627.             }

  628.             if (avctx->sw_pix_fmt != AV_PIX_FMT_NONE &&

  629.                 avctx->sw_pix_fmt != frames_ctx->sw_format) {

  630.                 av_log(avctx, AV_LOG_ERROR,

  631.                        "Mismatching AVCodecContext.sw_pix_fmt (%s) "

  632.                        "and AVHWFramesContext.sw_format (%s)\n",

  633.                        av_get_pix_fmt_name(avctx->sw_pix_fmt),

  634.                        av_get_pix_fmt_name(frames_ctx->sw_format));

  635.                 ret = AVERROR(EINVAL);

  636.                 goto free_and_end;

  637.             }

  638.             avctx->sw_pix_fmt = frames_ctx->sw_format;

  639.         }

  640.     }

  641. 

  642.     if (avctx->codec->init && !(avctx->active_thread_type & FF_THREAD_FRAME)) {

  643.         ret = avctx->codec->init(avctx);

  644.         if (ret < 0) {

  645.             goto free_and_end;

  646.         }

  647.     }

  648. 

  649.     if (av_codec_is_decoder(avctx->codec)) {

  650.         /* validate channel layout from the decoder */

  651.         if (avctx->channel_layout) {

  652.             int channels = av_get_channel_layout_nb_channels(avctx->channel_layout);

  653.             if (!avctx->channels)

  654.                 avctx->channels = channels;

  655.             else if (channels != avctx->channels) {

  656.                 av_log(avctx, AV_LOG_WARNING,

  657.                        "channel layout does not match number of channels\n");

  658.                 avctx->channel_layout = 0;

  659.             }

  660.         }

  661.         if (avctx->channels && avctx->channels < 0 ||

  662.             avctx->channels > FF_SANE_NB_CHANNELS) {

  663.             ret = AVERROR(EINVAL);

  664.             goto free_and_end;

  665.         }

  666.     }

  667. end:

  668.     if (!(codec->caps_internal & FF_CODEC_CAP_INIT_THREADSAFE) && codec->init) {

  669.         entangled_thread_counter--;

  670. 

  671.         /* Release any user-supplied mutex. */

  672.         if (lockmgr_cb) {

  673.             (*lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);

  674.         }

  675.     }

  676. 

  677.     if (options) {

  678.         av_dict_free(options);

  679.         *options = tmp;

  680.     }

  681. 

  682.     return ret;

  683. free_and_end:

  684.     if (avctx->codec &&

  685.         (avctx->codec->caps_internal & FF_CODEC_CAP_INIT_CLEANUP))

  686.         avctx->codec->close(avctx);

  687. 

  688.     if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)

  689.         av_opt_free(avctx->priv_data);

  690.     av_opt_free(avctx);

  691. 

  692. #if FF_API_CODED_FRAME

  693. FF_DISABLE_DEPRECATION_WARNINGS

  694.     av_frame_free(&avctx->coded_frame);

  695. FF_ENABLE_DEPRECATION_WARNINGS

  696. #endif

  697. 

  698.     av_dict_free(&tmp);

  699.     av_freep(&avctx->priv_data);

  700.     if (avctx->internal) {

  701.         av_frame_free(&avctx->internal->to_free);

  702.         av_frame_free(&avctx->internal->compat_decode_frame);

  703.         av_frame_free(&avctx->internal->buffer_frame);

  704.         av_packet_free(&avctx->internal->buffer_pkt);

  705.         av_packet_free(&avctx->internal->last_pkt_props);

  706. 

  707.         av_packet_free(&avctx->internal->ds.in_pkt);

  708. 

  709.         av_freep(&avctx->internal->pool);

  710.     }

  711.     av_freep(&avctx->internal);

  712.     avctx->codec = NULL;

  713.     goto end;

  714. }

  715. 

  716. void avsubtitle_free(AVSubtitle *sub)

  717. {

  718.     int i;

  719. 

  720.     for (i = 0; i < sub->num_rects; i++) {

  721.         av_freep(&sub->rects[i]->data[0]);

  722.         av_freep(&sub->rects[i]->data[1]);

  723.         av_freep(&sub->rects[i]->data[2]);

  724.         av_freep(&sub->rects[i]->data[3]);

  725.         av_freep(&sub->rects[i]->text);

  726.         av_freep(&sub->rects[i]->ass);

  727.         av_freep(&sub->rects[i]);

  728.     }

  729. 

  730.     av_freep(&sub->rects);

  731. 

  732.     memset(sub, 0, sizeof(AVSubtitle));

  733. }

  734. 

  735. av_cold int avcodec_close(AVCodecContext *avctx)

  736. {

  737.     int i;

  738. 

  739.     if (avcodec_is_open(avctx)) {

  740.         FramePool *pool = avctx->internal->pool;

  741. 

  742.         if (HAVE_THREADS && avctx->internal->thread_ctx)

  743.             ff_thread_free(avctx);

  744.         if (avctx->codec && avctx->codec->close)

  745.             avctx->codec->close(avctx);

  746.         av_frame_free(&avctx->internal->to_free);

  747.         av_frame_free(&avctx->internal->compat_decode_frame);

  748.         av_frame_free(&avctx->internal->buffer_frame);

  749.         av_packet_free(&avctx->internal->buffer_pkt);

  750.         av_packet_free(&avctx->internal->last_pkt_props);

  751. 

  752.         av_packet_free(&avctx->internal->ds.in_pkt);

  753. 

  754.         for (i = 0; i < FF_ARRAY_ELEMS(pool->pools); i++)

  755.             av_buffer_pool_uninit(&pool->pools[i]);

  756.         av_freep(&avctx->internal->pool);

  757. 

  758.         if (avctx->hwaccel && avctx->hwaccel->uninit)

  759.             avctx->hwaccel->uninit(avctx);

  760.         av_freep(&avctx->internal->hwaccel_priv_data);

  761. 

  762.         ff_decode_bsfs_uninit(avctx);

  763. 

  764.         av_freep(&avctx->internal);

  765.     }

  766. 

  767.     for (i = 0; i < avctx->nb_coded_side_data; i++)

  768.         av_freep(&avctx->coded_side_data[i].data);

  769.     av_freep(&avctx->coded_side_data);

  770.     avctx->nb_coded_side_data = 0;

  771. 

  772.     av_buffer_unref(&avctx->hw_frames_ctx);

  773.     av_buffer_unref(&avctx->hw_device_ctx);

  774. 

  775.     if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)

  776.         av_opt_free(avctx->priv_data);

  777.     av_opt_free(avctx);

  778.     av_freep(&avctx->priv_data);

  779.     if (av_codec_is_encoder(avctx->codec)) {

  780.         av_freep(&avctx->extradata);

  781. #if FF_API_CODED_FRAME

  782. FF_DISABLE_DEPRECATION_WARNINGS

  783.         av_frame_free(&avctx->coded_frame);

  784. FF_ENABLE_DEPRECATION_WARNINGS

  785. #endif

  786.     }

  787.     avctx->codec = NULL;

  788.     avctx->active_thread_type = 0;

  789. 

  790.     return 0;

  791. }

  792. 

  793. static AVCodec *find_encdec(enum AVCodecID id, int encoder)

  794. {

  795.     AVCodec *p, *experimental = NULL;

  796.     p = first_avcodec;

  797.     while (p) {

  798.         if ((encoder ? av_codec_is_encoder(p) : av_codec_is_decoder(p)) &&

  799.             p->id == id) {

  800.             if (p->capabilities & AV_CODEC_CAP_EXPERIMENTAL && !experimental) {

  801.                 experimental = p;

  802.             } else

  803.                 return p;

  804.         }

  805.         p = p->next;

  806.     }

  807.     return experimental;

  808. }

  809. 

  810. AVCodec *avcodec_find_encoder(enum AVCodecID id)

  811. {

  812.     return find_encdec(id, 1);

  813. }

  814. 

  815. AVCodec *avcodec_find_encoder_by_name(const char *name)

  816. {

  817.     AVCodec *p;

  818.     if (!name)

  819.         return NULL;

  820.     p = first_avcodec;

  821.     while (p) {

  822.         if (av_codec_is_encoder(p) && strcmp(name, p->name) == 0)

  823.             return p;

  824.         p = p->next;

  825.     }

  826.     return NULL;

  827. }

  828. 

  829. AVCodec *avcodec_find_decoder(enum AVCodecID id)

  830. {

  831.     return find_encdec(id, 0);

  832. }

  833. 

  834. AVCodec *avcodec_find_decoder_by_name(const char *name)

  835. {

  836.     AVCodec *p;

  837.     if (!name)

  838.         return NULL;

  839.     p = first_avcodec;

  840.     while (p) {

  841.         if (av_codec_is_decoder(p) && strcmp(name, p->name) == 0)

  842.             return p;

  843.         p = p->next;

  844.     }

  845.     return NULL;

  846. }

  847. 

  848. static int get_bit_rate(AVCodecContext *ctx)

  849. {

  850.     int bit_rate;

  851.     int bits_per_sample;

  852. 

  853.     switch (ctx->codec_type) {

  854.     case AVMEDIA_TYPE_VIDEO:

  855.     case AVMEDIA_TYPE_DATA:

  856.     case AVMEDIA_TYPE_SUBTITLE:

  857.     case AVMEDIA_TYPE_ATTACHMENT:

  858.         bit_rate = ctx->bit_rate;

  859.         break;

  860.     case AVMEDIA_TYPE_AUDIO:

  861.         bits_per_sample = av_get_bits_per_sample(ctx->codec_id);

  862.         bit_rate = bits_per_sample ? ctx->sample_rate * ctx->channels * bits_per_sample : ctx->bit_rate;

  863.         break;

  864.     default:

  865.         bit_rate = 0;

  866.         break;

  867.     }

  868.     return bit_rate;

  869. }

  870. 

  871. size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)

  872. {

  873.     int i, len, ret = 0;

  874. 

  875. #define TAG_PRINT(x)                                              \

  876.     (((x) >= '0' && (x) <= '9') ||                                \

  877.      ((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z') ||  \

  878.      ((x) == '.' || (x) == ' '))

  879. 

  880.     for (i = 0; i < 4; i++) {

  881.         len = snprintf(buf, buf_size,

  882.                        TAG_PRINT(codec_tag & 0xFF) ? "%c" : "[%d]", codec_tag & 0xFF);

  883.         buf        += len;

  884.         buf_size    = buf_size > len ? buf_size - len : 0;

  885.         ret        += len;

  886.         codec_tag >>= 8;

  887.     }

  888.     return ret;

  889. }

  890. 

  891. void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)

  892. {

  893.     const char *codec_name;

  894.     const char *profile = NULL;

  895.     char buf1[32];

  896.     int bitrate;

  897.     int new_line = 0;

  898.     AVRational display_aspect_ratio;

  899.     const AVCodecDescriptor *desc = avcodec_descriptor_get(enc->codec_id);

  900. 

  901.     if (desc) {

  902.         codec_name = desc->name;

  903.         profile = avcodec_profile_name(enc->codec_id, enc->profile);

  904.     } else if (enc->codec_id == AV_CODEC_ID_MPEG2TS) {

  905.         /* fake mpeg2 transport stream codec (currently not

  906.          * registered) */

  907.         codec_name = "mpeg2ts";

  908.     } else {

  909.         /* output avi tags */

  910.         char tag_buf[32];

  911.         av_get_codec_tag_string(tag_buf, sizeof(tag_buf), enc->codec_tag);

  912.         snprintf(buf1, sizeof(buf1), "%s / 0x%04X", tag_buf, enc->codec_tag);

  913.         codec_name = buf1;

  914.     }

  915. 

  916.     switch (enc->codec_type) {

  917.     case AVMEDIA_TYPE_VIDEO:

  918.         snprintf(buf, buf_size,

  919.                  "Video: %s%s",

  920.                  codec_name, enc->mb_decision ? " (hq)" : "");

  921.         if (profile)

  922.             snprintf(buf + strlen(buf), buf_size - strlen(buf),

  923.                      " (%s)", profile);

  924.         if (enc->codec_tag) {

  925.             char tag_buf[32];

  926.             av_get_codec_tag_string(tag_buf, sizeof(tag_buf), enc->codec_tag);

  927.             snprintf(buf + strlen(buf), buf_size - strlen(buf),

  928.                      " [%s / 0x%04X]", tag_buf, enc->codec_tag);

  929.         }

  930. 

  931.         av_strlcat(buf, "\n      ", buf_size);

  932.         snprintf(buf + strlen(buf), buf_size - strlen(buf),

  933.                  "%s", enc->pix_fmt == AV_PIX_FMT_NONE ? "none" :

  934.                      av_get_pix_fmt_name(enc->pix_fmt));

  935. 

  936.         if (enc->color_range != AVCOL_RANGE_UNSPECIFIED)

  937.             snprintf(buf + strlen(buf), buf_size - strlen(buf), ", %s",

  938.                      av_color_range_name(enc->color_range));

  939.         if (enc->colorspace != AVCOL_SPC_UNSPECIFIED ||

  940.             enc->color_primaries != AVCOL_PRI_UNSPECIFIED ||

  941.             enc->color_trc != AVCOL_TRC_UNSPECIFIED) {

  942.             new_line = 1;

  943.             snprintf(buf + strlen(buf), buf_size - strlen(buf), ", %s/%s/%s",

  944.                      av_color_space_name(enc->colorspace),

  945.                      av_color_primaries_name(enc->color_primaries),

  946.                      av_color_transfer_name(enc->color_trc));

  947.         }

  948.         if (av_log_get_level() >= AV_LOG_DEBUG &&

  949.             enc->chroma_sample_location != AVCHROMA_LOC_UNSPECIFIED)

  950.             snprintf(buf + strlen(buf), buf_size - strlen(buf), ", %s",

  951.                      av_chroma_location_name(enc->chroma_sample_location));

  952. 

  953.         if (enc->width) {

  954.             av_strlcat(buf, new_line ? "\n      " : ", ", buf_size);

  955. 

  956.             snprintf(buf + strlen(buf), buf_size - strlen(buf),

  957.                      "%dx%d",

  958.                      enc->width, enc->height);

  959. 

  960.             if (av_log_get_level() >= AV_LOG_VERBOSE &&

  961.                 (enc->width != enc->coded_width ||

  962.                  enc->height != enc->coded_height))

  963.                 snprintf(buf + strlen(buf), buf_size - strlen(buf),

  964.                          " (%dx%d)", enc->coded_width, enc->coded_height);

  965. 

  966.             if (enc->sample_aspect_ratio.num) {

  967.                 av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,

  968.                           enc->width * enc->sample_aspect_ratio.num,

  969.                           enc->height * enc->sample_aspect_ratio.den,

  970.                           1024 * 1024);

  971.                 snprintf(buf + strlen(buf), buf_size - strlen(buf),

  972.                          " [PAR %d:%d DAR %d:%d]",

  973.                          enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,

  974.                          display_aspect_ratio.num, display_aspect_ratio.den);

  975.             }

  976.             if (av_log_get_level() >= AV_LOG_DEBUG) {

  977.                 int g = av_gcd(enc->time_base.num, enc->time_base.den);

  978.                 snprintf(buf + strlen(buf), buf_size - strlen(buf),

  979.                          ", %d/%d",

  980.                          enc->time_base.num / g, enc->time_base.den / g);

  981.             }

  982.         }

  983.         if (encode) {

  984.             snprintf(buf + strlen(buf), buf_size - strlen(buf),

  985.                      ", q=%d-%d", enc->qmin, enc->qmax);

  986.         }

  987.         break;

  988.     case AVMEDIA_TYPE_AUDIO:

  989.         snprintf(buf, buf_size,

  990.                  "Audio: %s",

  991.                  codec_name);

  992.         if (profile)

  993.             snprintf(buf + strlen(buf), buf_size - strlen(buf),

  994.                      " (%s)", profile);

  995.         if (enc->codec_tag) {

  996.             char tag_buf[32];

  997.             av_get_codec_tag_string(tag_buf, sizeof(tag_buf), enc->codec_tag);

  998.             snprintf(buf + strlen(buf), buf_size - strlen(buf),

  999.                      " [%s / 0x%04X]", tag_buf, enc->codec_tag);

  1000.         }

  1001. 

  1002.         av_strlcat(buf, "\n      ", buf_size);

  1003.         if (enc->sample_rate) {

  1004.             snprintf(buf + strlen(buf), buf_size - strlen(buf),

  1005.                      "%d Hz, ", enc->sample_rate);

  1006.         }

  1007.         av_get_channel_layout_string(buf + strlen(buf), buf_size - strlen(buf), enc->channels, enc->channel_layout);

  1008.         if (enc->sample_fmt != AV_SAMPLE_FMT_NONE) {

  1009.             snprintf(buf + strlen(buf), buf_size - strlen(buf),

  1010.                      ", %s", av_get_sample_fmt_name(enc->sample_fmt));

  1011.         }

  1012.         break;

  1013.     case AVMEDIA_TYPE_DATA:

  1014.         snprintf(buf, buf_size, "Data: %s", codec_name);

  1015.         break;

  1016.     case AVMEDIA_TYPE_SUBTITLE:

  1017.         snprintf(buf, buf_size, "Subtitle: %s", codec_name);

  1018.         break;

  1019.     case AVMEDIA_TYPE_ATTACHMENT:

  1020.         snprintf(buf, buf_size, "Attachment: %s", codec_name);

  1021.         break;

  1022.     default:

  1023.         snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);

  1024.         return;

  1025.     }

  1026.     if (encode) {

  1027.         if (enc->flags & AV_CODEC_FLAG_PASS1)

  1028.             snprintf(buf + strlen(buf), buf_size - strlen(buf),

  1029.                      ", pass 1");

  1030.         if (enc->flags & AV_CODEC_FLAG_PASS2)

  1031.             snprintf(buf + strlen(buf), buf_size - strlen(buf),

  1032.                      ", pass 2");

  1033.     }

  1034.     bitrate = get_bit_rate(enc);

  1035.     if (bitrate != 0) {

  1036.         snprintf(buf + strlen(buf), buf_size - strlen(buf),

  1037.                  ", %d kb/s", bitrate / 1000);

  1038.     }

  1039. }

  1040. 

  1041. const char *av_get_profile_name(const AVCodec *codec, int profile)

  1042. {

  1043.     const AVProfile *p;

  1044.     if (profile == FF_PROFILE_UNKNOWN || !codec->profiles)

  1045.         return NULL;

  1046. 

  1047.     for (p = codec->profiles; p->profile != FF_PROFILE_UNKNOWN; p++)

  1048.         if (p->profile == profile)

  1049.             return p->name;

  1050. 

  1051.     return NULL;

  1052. }

  1053. 

  1054. const char *avcodec_profile_name(enum AVCodecID codec_id, int profile)

  1055. {

  1056.     const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);

  1057.     const AVProfile *p;

  1058. 

  1059.     if (profile == FF_PROFILE_UNKNOWN || !desc || !desc->profiles)

  1060.         return NULL;

  1061. 

  1062.     for (p = desc->profiles; p->profile != FF_PROFILE_UNKNOWN; p++)

  1063.         if (p->profile == profile)

  1064.             return p->name;

  1065. 

  1066.     return NULL;

  1067. }

  1068. 

  1069. unsigned avcodec_version(void)

  1070. {

  1071.     return LIBAVCODEC_VERSION_INT;

  1072. }

  1073. 

  1074. const char *avcodec_configuration(void)

  1075. {

  1076.     return LIBAV_CONFIGURATION;

  1077. }

  1078. 

  1079. const char *avcodec_license(void)

  1080. {

  1081. #define LICENSE_PREFIX "libavcodec license: "

  1082.     return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;

  1083. }

  1084. 

  1085. int av_get_exact_bits_per_sample(enum AVCodecID codec_id)

  1086. {

  1087.     switch (codec_id) {

  1088.     case AV_CODEC_ID_ADPCM_CT:

  1089.     case AV_CODEC_ID_ADPCM_IMA_APC:

  1090.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  1091.     case AV_CODEC_ID_ADPCM_IMA_WS:

  1092.     case AV_CODEC_ID_ADPCM_G722:

  1093.     case AV_CODEC_ID_ADPCM_YAMAHA:

  1094.         return 4;

  1095.     case AV_CODEC_ID_PCM_ALAW:

  1096.     case AV_CODEC_ID_PCM_MULAW:

  1097.     case AV_CODEC_ID_PCM_S8:

  1098.     case AV_CODEC_ID_PCM_U8:

  1099.     case AV_CODEC_ID_PCM_ZORK:

  1100.         return 8;

  1101.     case AV_CODEC_ID_PCM_S16BE:

  1102.     case AV_CODEC_ID_PCM_S16BE_PLANAR:

  1103.     case AV_CODEC_ID_PCM_S16LE:

  1104.     case AV_CODEC_ID_PCM_S16LE_PLANAR:

  1105.     case AV_CODEC_ID_PCM_U16BE:

  1106.     case AV_CODEC_ID_PCM_U16LE:

  1107.         return 16;

  1108.     case AV_CODEC_ID_PCM_S24DAUD:

  1109.     case AV_CODEC_ID_PCM_S24BE:

  1110.     case AV_CODEC_ID_PCM_S24LE:

  1111.     case AV_CODEC_ID_PCM_S24LE_PLANAR:

  1112.     case AV_CODEC_ID_PCM_U24BE:

  1113.     case AV_CODEC_ID_PCM_U24LE:

  1114.         return 24;

  1115.     case AV_CODEC_ID_PCM_S32BE:

  1116.     case AV_CODEC_ID_PCM_S32LE:

  1117.     case AV_CODEC_ID_PCM_S32LE_PLANAR:

  1118.     case AV_CODEC_ID_PCM_U32BE:

  1119.     case AV_CODEC_ID_PCM_U32LE:

  1120.     case AV_CODEC_ID_PCM_F32BE:

  1121.     case AV_CODEC_ID_PCM_F32LE:

  1122.         return 32;

  1123.     case AV_CODEC_ID_PCM_F64BE:

  1124.     case AV_CODEC_ID_PCM_F64LE:

  1125.         return 64;

  1126.     default:

  1127.         return 0;

  1128.     }

  1129. }

  1130. 

  1131. int av_get_bits_per_sample(enum AVCodecID codec_id)

  1132. {

  1133.     switch (codec_id) {

  1134.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  1135.         return 2;

  1136.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  1137.         return 3;

  1138.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  1139.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  1140.     case AV_CODEC_ID_ADPCM_IMA_QT:

  1141.     case AV_CODEC_ID_ADPCM_SWF:

  1142.     case AV_CODEC_ID_ADPCM_MS:

  1143.         return 4;

  1144.     default:

  1145.         return av_get_exact_bits_per_sample(codec_id);

  1146.     }

  1147. }

  1148. 

  1149. static int get_audio_frame_duration(enum AVCodecID id, int sr, int ch, int ba,

  1150.                                     uint32_t tag, int bits_per_coded_sample, int frame_bytes)

  1151. {

  1152.     int bps = av_get_exact_bits_per_sample(id);

  1153. 

  1154.     /* codecs with an exact constant bits per sample */

  1155.     if (bps > 0 && ch > 0 && frame_bytes > 0)

  1156.         return (frame_bytes * 8) / (bps * ch);

  1157.     bps = bits_per_coded_sample;

  1158. 

  1159.     /* codecs with a fixed packet duration */

  1160.     switch (id) {

  1161.     case AV_CODEC_ID_ADPCM_ADX:    return   32;

  1162.     case AV_CODEC_ID_ADPCM_IMA_QT: return   64;

  1163.     case AV_CODEC_ID_ADPCM_EA_XAS: return  128;

  1164.     case AV_CODEC_ID_AMR_NB:

  1165.     case AV_CODEC_ID_GSM:

  1166.     case AV_CODEC_ID_QCELP:

  1167.     case AV_CODEC_ID_RA_144:

  1168.     case AV_CODEC_ID_RA_288:       return  160;

  1169.     case AV_CODEC_ID_IMC:          return  256;

  1170.     case AV_CODEC_ID_AMR_WB:

  1171.     case AV_CODEC_ID_GSM_MS:       return  320;

  1172.     case AV_CODEC_ID_MP1:          return  384;

  1173.     case AV_CODEC_ID_ATRAC1:       return  512;

  1174.     case AV_CODEC_ID_ATRAC3:       return 1024;

  1175.     case AV_CODEC_ID_MP2:

  1176.     case AV_CODEC_ID_MUSEPACK7:    return 1152;

  1177.     case AV_CODEC_ID_AC3:          return 1536;

  1178.     }

  1179. 

  1180.     if (sr > 0) {

  1181.         /* calc from sample rate */

  1182.         if (id == AV_CODEC_ID_TTA)

  1183.             return 256 * sr / 245;

  1184. 

  1185.         if (ch > 0) {

  1186.             /* calc from sample rate and channels */

  1187.             if (id == AV_CODEC_ID_BINKAUDIO_DCT)

  1188.                 return (480 << (sr / 22050)) / ch;

  1189.         }

  1190. 

  1191.         if (id == AV_CODEC_ID_MP3)

  1192.             return sr <= 24000 ? 576 : 1152;

  1193.     }

  1194. 

  1195.     if (ba > 0) {

  1196.         /* calc from block_align */

  1197.         if (id == AV_CODEC_ID_SIPR) {

  1198.             switch (ba) {

  1199.             case 20: return 160;

  1200.             case 19: return 144;

  1201.             case 29: return 288;

  1202.             case 37: return 480;

  1203.             }

  1204.         } else if (id == AV_CODEC_ID_ILBC) {

  1205.             switch (ba) {

  1206.             case 38: return 160;

  1207.             case 50: return 240;

  1208.             }

  1209.         }

  1210.     }

  1211. 

  1212.     if (frame_bytes > 0) {

  1213.         /* calc from frame_bytes only */

  1214.         if (id == AV_CODEC_ID_TRUESPEECH)

  1215.             return 240 * (frame_bytes / 32);

  1216.         if (id == AV_CODEC_ID_NELLYMOSER)

  1217.             return 256 * (frame_bytes / 64);

  1218. 

  1219.         if (bps > 0) {

  1220.             /* calc from frame_bytes and bits_per_coded_sample */

  1221.             if (id == AV_CODEC_ID_ADPCM_G726)

  1222.                 return frame_bytes * 8 / bps;

  1223.         }

  1224. 

  1225.         if (ch > 0) {

  1226.             /* calc from frame_bytes and channels */

  1227.             switch (id) {

  1228.             case AV_CODEC_ID_ADPCM_4XM:

  1229.             case AV_CODEC_ID_ADPCM_IMA_ISS:

  1230.                 return (frame_bytes - 4 * ch) * 2 / ch;

  1231.             case AV_CODEC_ID_ADPCM_IMA_SMJPEG:

  1232.                 return (frame_bytes - 4) * 2 / ch;

  1233.             case AV_CODEC_ID_ADPCM_IMA_AMV:

  1234.                 return (frame_bytes - 8) * 2 / ch;

  1235.             case AV_CODEC_ID_ADPCM_XA:

  1236.                 return (frame_bytes / 128) * 224 / ch;

  1237.             case AV_CODEC_ID_INTERPLAY_DPCM:

  1238.                 return (frame_bytes - 6 - ch) / ch;

  1239.             case AV_CODEC_ID_ROQ_DPCM:

  1240.                 return (frame_bytes - 8) / ch;

  1241.             case AV_CODEC_ID_XAN_DPCM:

  1242.                 return (frame_bytes - 2 * ch) / ch;

  1243.             case AV_CODEC_ID_MACE3:

  1244.                 return 3 * frame_bytes / ch;

  1245.             case AV_CODEC_ID_MACE6:

  1246.                 return 6 * frame_bytes / ch;

  1247.             case AV_CODEC_ID_PCM_LXF:

  1248.                 return 2 * (frame_bytes / (5 * ch));

  1249.             }

  1250. 

  1251.             if (tag) {

  1252.                 /* calc from frame_bytes, channels, and codec_tag */

  1253.                 if (id == AV_CODEC_ID_SOL_DPCM) {

  1254.                     if (tag == 3)

  1255.                         return frame_bytes / ch;

  1256.                     else

  1257.                         return frame_bytes * 2 / ch;

  1258.                 }

  1259.             }

  1260. 

  1261.             if (ba > 0) {

  1262.                 /* calc from frame_bytes, channels, and block_align */

  1263.                 int blocks = frame_bytes / ba;

  1264.                 switch (id) {

  1265.                 case AV_CODEC_ID_ADPCM_IMA_WAV:

  1266.                     return blocks * (1 + (ba - 4 * ch) / (4 * ch) * 8);

  1267.                 case AV_CODEC_ID_ADPCM_IMA_DK3:

  1268.                     return blocks * (((ba - 16) * 2 / 3 * 4) / ch);

  1269.                 case AV_CODEC_ID_ADPCM_IMA_DK4:

  1270.                     return blocks * (1 + (ba - 4 * ch) * 2 / ch);

  1271.                 case AV_CODEC_ID_ADPCM_MS:

  1272.                     return blocks * (2 + (ba - 7 * ch) * 2 / ch);

  1273.                 }

  1274.             }

  1275. 

  1276.             if (bps > 0) {

  1277.                 /* calc from frame_bytes, channels, and bits_per_coded_sample */

  1278.                 switch (id) {

  1279.                 case AV_CODEC_ID_PCM_DVD:

  1280.                     return 2 * (frame_bytes / ((bps * 2 / 8) * ch));

  1281.                 case AV_CODEC_ID_PCM_BLURAY:

  1282.                     return frame_bytes / ((FFALIGN(ch, 2) * bps) / 8);

  1283.                 case AV_CODEC_ID_S302M:

  1284.                     return 2 * (frame_bytes / ((bps + 4) / 4)) / ch;

  1285.                 }

  1286.             }

  1287.         }

  1288.     }

  1289. 

  1290.     return 0;

  1291. }

  1292. 

  1293. int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)

  1294. {

  1295.     return get_audio_frame_duration(avctx->codec_id, avctx->sample_rate,

  1296.                                     avctx->channels, avctx->block_align,

  1297.                                     avctx->codec_tag, avctx->bits_per_coded_sample,

  1298.                                     frame_bytes);

  1299. }

  1300. 

  1301. int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)

  1302. {

  1303.     return get_audio_frame_duration(par->codec_id, par->sample_rate,

  1304.                                     par->channels, par->block_align,

  1305.                                     par->codec_tag, par->bits_per_coded_sample,

  1306.                                     frame_bytes);

  1307. }

  1308. 

  1309. #if !HAVE_THREADS

  1310. int ff_thread_init(AVCodecContext *s)

  1311. {

  1312.     return -1;

  1313. }

  1314. 

  1315. #endif

  1316. 

  1317. unsigned int av_xiphlacing(unsigned char *s, unsigned int v)

  1318. {

  1319.     unsigned int n = 0;

  1320. 

  1321.     while (v >= 0xff) {

  1322.         *s++ = 0xff;

  1323.         v -= 0xff;

  1324.         n++;

  1325.     }

  1326.     *s = v;

  1327.     n++;

  1328.     return n;

  1329. }

  1330. 

  1331. int ff_match_2uint16(const uint16_t(*tab)[2], int size, int a, int b)

  1332. {

  1333.     int i;

  1334.     for (i = 0; i < size && !(tab[i][0] == a && tab[i][1] == b); i++) ;

  1335.     return i;

  1336. }

  1337. 

  1338. static AVHWAccel *first_hwaccel = NULL;

  1339. 

  1340. void av_register_hwaccel(AVHWAccel *hwaccel)

  1341. {

  1342.     AVHWAccel **p = &first_hwaccel;

  1343.     while (*p)

  1344.         p = &(*p)->next;

  1345.     *p = hwaccel;

  1346.     hwaccel->next = NULL;

  1347. }

  1348. 

  1349. AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel)

  1350. {

  1351.     return hwaccel ? hwaccel->next : first_hwaccel;

  1352. }

  1353. 

  1354. int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))

  1355. {

  1356.     if (lockmgr_cb) {

  1357.         // There is no good way to rollback a failure to destroy the

  1358.         // mutex, so we ignore failures.

  1359.         lockmgr_cb(&codec_mutex,    AV_LOCK_DESTROY);

  1360.         lockmgr_cb(&avformat_mutex, AV_LOCK_DESTROY);

  1361.         lockmgr_cb     = NULL;

  1362.         codec_mutex    = NULL;

  1363.         avformat_mutex = NULL;

  1364.     }

  1365. 

  1366.     if (cb) {

  1367.         void *new_codec_mutex    = NULL;

  1368.         void *new_avformat_mutex = NULL;

  1369.         int err;

  1370.         if (err = cb(&new_codec_mutex, AV_LOCK_CREATE)) {

  1371.             return err > 0 ? AVERROR_UNKNOWN : err;

  1372.         }

  1373.         if (err = cb(&new_avformat_mutex, AV_LOCK_CREATE)) {

  1374.             // Ignore failures to destroy the newly created mutex.

  1375.             cb(&new_codec_mutex, AV_LOCK_DESTROY);

  1376.             return err > 0 ? AVERROR_UNKNOWN : err;

  1377.         }

  1378.         lockmgr_cb     = cb;

  1379.         codec_mutex    = new_codec_mutex;

  1380.         avformat_mutex = new_avformat_mutex;

  1381.     }

  1382. 

  1383.     return 0;

  1384. }

  1385. 

  1386. int avpriv_lock_avformat(void)

  1387. {

  1388.     if (lockmgr_cb) {

  1389.         if ((*lockmgr_cb)(&avformat_mutex, AV_LOCK_OBTAIN))

  1390.             return -1;

  1391.     }

  1392.     return 0;

  1393. }

  1394. 

  1395. int avpriv_unlock_avformat(void)

  1396. {

  1397.     if (lockmgr_cb) {

  1398.         if ((*lockmgr_cb)(&avformat_mutex, AV_LOCK_RELEASE))

  1399.             return -1;

  1400.     }

  1401.     return 0;

  1402. }

  1403. 

  1404. unsigned int avpriv_toupper4(unsigned int x)

  1405. {

  1406.     return av_toupper(x & 0xFF) +

  1407.           (av_toupper((x >>  8) & 0xFF) << 8)  +

  1408.           (av_toupper((x >> 16) & 0xFF) << 16) +

  1409.           (av_toupper((x >> 24) & 0xFF) << 24);

  1410. }

  1411. 

  1412. int ff_thread_ref_frame(ThreadFrame *dst, ThreadFrame *src)

  1413. {

  1414.     int ret;

  1415. 

  1416.     dst->owner = src->owner;

  1417. 

  1418.     ret = av_frame_ref(dst->f, src->f);

  1419.     if (ret < 0)

  1420.         return ret;

  1421. 

  1422.     if (src->progress &&

  1423.         !(dst->progress = av_buffer_ref(src->progress))) {

  1424.         ff_thread_release_buffer(dst->owner, dst);

  1425.         return AVERROR(ENOMEM);

  1426.     }

  1427. 

  1428.     return 0;

  1429. }

  1430. 

  1431. #if !HAVE_THREADS

  1432. 

  1433. int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)

  1434. {

  1435.     f->owner = avctx;

  1436.     return ff_get_buffer(avctx, f->f, flags);

  1437. }

  1438. 

  1439. void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)

  1440. {

  1441.     if (f->f)

  1442.         av_frame_unref(f->f);

  1443. }

  1444. 

  1445. void ff_thread_finish_setup(AVCodecContext *avctx)

  1446. {

  1447. }

  1448. 

  1449. void ff_thread_report_progress(ThreadFrame *f, int progress, int field)

  1450. {

  1451. }

  1452. 

  1453. void ff_thread_await_progress(ThreadFrame *f, int progress, int field)

  1454. {

  1455. }

  1456. 

  1457. #endif

  1458. 

  1459. int avcodec_is_open(AVCodecContext *s)

  1460. {

  1461.     return !!s->internal;

  1462. }

  1463. 

  1464. const uint8_t *avpriv_find_start_code(const uint8_t *restrict p,

  1465.                                       const uint8_t *end,

  1466.                                       uint32_t * restrict state)

  1467. {

  1468.     int i;

  1469. 

  1470.     assert(p <= end);

  1471.     if (p >= end)

  1472.         return end;

  1473. 

  1474.     for (i = 0; i < 3; i++) {

  1475.         uint32_t tmp = *state << 8;

  1476.         *state = tmp + *(p++);

  1477.         if (tmp == 0x100 || p == end)

  1478.             return p;

  1479.     }

  1480. 

  1481.     while (p < end) {

  1482.         if      (p[-1] > 1      ) p += 3;

  1483.         else if (p[-2]          ) p += 2;

  1484.         else if (p[-3]|(p[-1]-1)) p++;

  1485.         else {

  1486.             p++;

  1487.             break;

  1488.         }

  1489.     }

  1490. 

  1491.     p = FFMIN(p, end) - 4;

  1492.     *state = AV_RB32(p);

  1493. 

  1494.     return p + 4;

  1495. }

  1496. 

  1497. AVCPBProperties *av_cpb_properties_alloc(size_t *size)

  1498. {

  1499.     AVCPBProperties *props = av_mallocz(sizeof(AVCPBProperties));

  1500.     if (!props)

  1501.         return NULL;

  1502. 

  1503.     if (size)

  1504.         *size = sizeof(*props);

  1505. 

  1506.     props->vbv_delay = UINT64_MAX;

  1507. 

  1508.     return props;

  1509. }

  1510. 

  1511. AVCPBProperties *ff_add_cpb_side_data(AVCodecContext *avctx)

  1512. {

  1513.     AVPacketSideData *tmp;

  1514.     AVCPBProperties  *props;

  1515.     size_t size;

  1516. 

  1517.     props = av_cpb_properties_alloc(&size);

  1518.     if (!props)

  1519.         return NULL;

  1520. 

  1521.     tmp = av_realloc_array(avctx->coded_side_data, avctx->nb_coded_side_data + 1, sizeof(*tmp));

  1522.     if (!tmp) {

  1523.         av_freep(&props);

  1524.         return NULL;

  1525.     }

  1526. 

  1527.     avctx->coded_side_data = tmp;

  1528.     avctx->nb_coded_side_data++;

  1529. 

  1530.     avctx->coded_side_data[avctx->nb_coded_side_data - 1].type = AV_PKT_DATA_CPB_PROPERTIES;

  1531.     avctx->coded_side_data[avctx->nb_coded_side_data - 1].data = (uint8_t*)props;

  1532.     avctx->coded_side_data[avctx->nb_coded_side_data - 1].size = size;

  1533. 

  1534.     return props;

  1535. }

  1536. 

  1537. static void codec_parameters_reset(AVCodecParameters *par)

  1538. {

  1539.     av_freep(&par->extradata);

  1540. 

  1541.     memset(par, 0, sizeof(*par));

  1542. 

  1543.     par->codec_type          = AVMEDIA_TYPE_UNKNOWN;

  1544.     par->codec_id            = AV_CODEC_ID_NONE;

  1545.     par->format              = -1;

  1546.     par->field_order         = AV_FIELD_UNKNOWN;

  1547.     par->color_range         = AVCOL_RANGE_UNSPECIFIED;

  1548.     par->color_primaries     = AVCOL_PRI_UNSPECIFIED;

  1549.     par->color_trc           = AVCOL_TRC_UNSPECIFIED;

  1550.     par->color_space         = AVCOL_SPC_UNSPECIFIED;

  1551.     par->chroma_location     = AVCHROMA_LOC_UNSPECIFIED;

  1552.     par->sample_aspect_ratio = (AVRational){ 0, 1 };

  1553. }

  1554. 

  1555. AVCodecParameters *avcodec_parameters_alloc(void)

  1556. {

  1557.     AVCodecParameters *par = av_mallocz(sizeof(*par));

  1558. 

  1559.     if (!par)

  1560.         return NULL;

  1561.     codec_parameters_reset(par);

  1562.     return par;

  1563. }

  1564. 

  1565. void avcodec_parameters_free(AVCodecParameters **ppar)

  1566. {

  1567.     AVCodecParameters *par = *ppar;

  1568. 

  1569.     if (!par)

  1570.         return;

  1571.     codec_parameters_reset(par);

  1572. 

  1573.     av_freep(ppar);

  1574. }

  1575. 

  1576. int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)

  1577. {

  1578.     codec_parameters_reset(dst);

  1579.     memcpy(dst, src, sizeof(*dst));

  1580. 

  1581.     dst->extradata      = NULL;

  1582.     dst->extradata_size = 0;

  1583.     if (src->extradata) {

  1584.         dst->extradata = av_mallocz(src->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);

  1585.         if (!dst->extradata)

  1586.             return AVERROR(ENOMEM);

  1587.         memcpy(dst->extradata, src->extradata, src->extradata_size);

  1588.         dst->extradata_size = src->extradata_size;

  1589.     }

  1590. 

  1591.     return 0;

  1592. }

  1593. 

  1594. int avcodec_parameters_from_context(AVCodecParameters *par,

  1595.                                     const AVCodecContext *codec)

  1596. {

  1597.     codec_parameters_reset(par);

  1598. 

  1599.     par->codec_type = codec->codec_type;

  1600.     par->codec_id   = codec->codec_id;

  1601.     par->codec_tag  = codec->codec_tag;

  1602. 

  1603.     par->bit_rate              = codec->bit_rate;

  1604.     par->bits_per_coded_sample = codec->bits_per_coded_sample;

  1605.     par->profile               = codec->profile;

  1606.     par->level                 = codec->level;

  1607. 

  1608.     switch (par->codec_type) {

  1609.     case AVMEDIA_TYPE_VIDEO:

  1610.         par->format              = codec->pix_fmt;

  1611.         par->width               = codec->width;

  1612.         par->height              = codec->height;

  1613.         par->field_order         = codec->field_order;

  1614.         par->color_range         = codec->color_range;

  1615.         par->color_primaries     = codec->color_primaries;

  1616.         par->color_trc           = codec->color_trc;

  1617.         par->color_space         = codec->colorspace;

  1618.         par->chroma_location     = codec->chroma_sample_location;

  1619.         par->sample_aspect_ratio = codec->sample_aspect_ratio;

  1620.         break;

  1621.     case AVMEDIA_TYPE_AUDIO:

  1622.         par->format          = codec->sample_fmt;

  1623.         par->channel_layout  = codec->channel_layout;

  1624.         par->channels        = codec->channels;

  1625.         par->sample_rate     = codec->sample_rate;

  1626.         par->block_align     = codec->block_align;

  1627.         par->initial_padding = codec->initial_padding;

  1628.         break;

  1629.     }

  1630. 

  1631.     if (codec->extradata) {

  1632.         par->extradata = av_mallocz(codec->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);

  1633.         if (!par->extradata)

  1634.             return AVERROR(ENOMEM);

  1635.         memcpy(par->extradata, codec->extradata, codec->extradata_size);

  1636.         par->extradata_size = codec->extradata_size;

  1637.     }

  1638. 

  1639.     return 0;

  1640. }

  1641. 

  1642. int avcodec_parameters_to_context(AVCodecContext *codec,

  1643.                                   const AVCodecParameters *par)

  1644. {

  1645.     codec->codec_type = par->codec_type;

  1646.     codec->codec_id   = par->codec_id;

  1647.     codec->codec_tag  = par->codec_tag;

  1648. 

  1649.     codec->bit_rate              = par->bit_rate;

  1650.     codec->bits_per_coded_sample = par->bits_per_coded_sample;

  1651.     codec->profile               = par->profile;

  1652.     codec->level                 = par->level;

  1653. 

  1654.     switch (par->codec_type) {

  1655.     case AVMEDIA_TYPE_VIDEO:

  1656.         codec->pix_fmt                = par->format;

  1657.         codec->width                  = par->width;

  1658.         codec->height                 = par->height;

  1659.         codec->field_order            = par->field_order;

  1660.         codec->color_range            = par->color_range;

  1661.         codec->color_primaries        = par->color_primaries;

  1662.         codec->color_trc              = par->color_trc;

  1663.         codec->colorspace             = par->color_space;

  1664.         codec->chroma_sample_location = par->chroma_location;

  1665.         codec->sample_aspect_ratio    = par->sample_aspect_ratio;

  1666.         break;

  1667.     case AVMEDIA_TYPE_AUDIO:

  1668.         codec->sample_fmt      = par->format;

  1669.         codec->channel_layout  = par->channel_layout;

  1670.         codec->channels        = par->channels;

  1671.         codec->sample_rate     = par->sample_rate;

  1672.         codec->block_align     = par->block_align;

  1673.         codec->initial_padding = par->initial_padding;

  1674.         break;

  1675.     }

  1676. 

  1677.     if (par->extradata) {

  1678.         av_freep(&codec->extradata);

  1679.         codec->extradata = av_mallocz(par->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);

  1680.         if (!codec->extradata)

  1681.             return AVERROR(ENOMEM);

  1682.         memcpy(codec->extradata, par->extradata, par->extradata_size);

  1683.         codec->extradata_size = par->extradata_size;

  1684.     }

  1685. 

  1686.     return 0;

  1687. }