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FFmpeg/libavformat/ffmdec.c

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  1. /*

  2.  * FFM (ffserver live feed) demuxer

  3.  * Copyright (c) 2001 Fabrice Bellard

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

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

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

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

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

  18.  * License along with FFmpeg; if not, write to the Free Software

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

  20.  */

  21. 

  22. #include <stdint.h>

  23. 

  24. #include "libavutil/internal.h"

  25. #include "libavutil/intreadwrite.h"

  26. #include "libavutil/intfloat.h"

  27. #include "libavutil/opt.h"

  28. #include "libavutil/avassert.h"

  29. #include "libavutil/avstring.h"

  30. #include "libavutil/pixdesc.h"

  31. #include "avformat.h"

  32. #include "internal.h"

  33. #include "ffm.h"

  34. #include "avio_internal.h"

  35. 

  36. static int ffm_is_avail_data(AVFormatContext *s, int size)

  37. {

  38.     FFMContext *ffm = s->priv_data;

  39.     int64_t pos, avail_size;

  40.     ptrdiff_t len;

  41. 

  42.     len = ffm->packet_end - ffm->packet_ptr;

  43.     if (size <= len)

  44.         return 1;

  45.     pos = avio_tell(s->pb);

  46.     if (!ffm->write_index) {

  47.         if (pos == ffm->file_size)

  48.             return AVERROR_EOF;

  49.         avail_size = ffm->file_size - pos;

  50.     } else {

  51.     if (pos == ffm->write_index) {

  52.         /* exactly at the end of stream */

  53.         if (ffm->server_attached)

  54.             return AVERROR(EAGAIN);

  55.         else

  56.             return AVERROR_INVALIDDATA;

  57.     } else if (pos < ffm->write_index) {

  58.         avail_size = ffm->write_index - pos;

  59.     } else {

  60.         avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);

  61.     }

  62.     }

  63.     avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;

  64.     if (size <= avail_size)

  65.         return 1;

  66.     else if (ffm->server_attached)

  67.         return AVERROR(EAGAIN);

  68.     else

  69.         return AVERROR_INVALIDDATA;

  70. }

  71. 

  72. static int ffm_resync(AVFormatContext *s, uint32_t state)

  73. {

  74.     av_log(s, AV_LOG_ERROR, "resyncing\n");

  75.     while (state != PACKET_ID) {

  76.         if (avio_feof(s->pb)) {

  77.             av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");

  78.             return -1;

  79.         }

  80.         state = (state << 8) | avio_r8(s->pb);

  81.     }

  82.     return 0;

  83. }

  84. 

  85. /* first is true if we read the frame header */

  86. static int ffm_read_data(AVFormatContext *s,

  87.                          uint8_t *buf, int size, int header)

  88. {

  89.     FFMContext *ffm = s->priv_data;

  90.     AVIOContext *pb = s->pb;

  91.     int fill_size, size1, frame_offset;

  92.     uint32_t id;

  93.     ptrdiff_t len;

  94.     int64_t last_pos = -1;

  95. 

  96.     size1 = size;

  97.     while (size > 0) {

  98.     redo:

  99.         len = ffm->packet_end - ffm->packet_ptr;

  100.         if (len < 0)

  101.             return -1;

  102.         if (len > size)

  103.             len = size;

  104.         if (len == 0) {

  105.             if (avio_tell(pb) == ffm->file_size) {

  106.                 if (ffm->server_attached) {

  107.                     avio_seek(pb, ffm->packet_size, SEEK_SET);

  108.                 } else

  109.                     return AVERROR_EOF;

  110.             }

  111.     retry_read:

  112.             if (pb->buffer_size != ffm->packet_size) {

  113.                 int64_t tell = avio_tell(pb);

  114.                 int ret = ffio_set_buf_size(pb, ffm->packet_size);

  115.                 if (ret < 0)

  116.                     return ret;

  117.                 avio_seek(pb, tell, SEEK_SET);

  118.             }

  119.             id = avio_rb16(pb); /* PACKET_ID */

  120.             if (id != PACKET_ID) {

  121.                 if (ffm_resync(s, id) < 0)

  122.                     return -1;

  123.                 last_pos = avio_tell(pb);

  124.             }

  125.             fill_size = avio_rb16(pb);

  126.             ffm->dts = avio_rb64(pb);

  127.             frame_offset = avio_rb16(pb);

  128.             avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);

  129.             if (ffm->packet_size < FFM_HEADER_SIZE + fill_size || frame_offset < 0) {

  130.                 return -1;

  131.             }

  132.             ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);

  133.             /* if first packet or resynchronization packet, we must

  134.                handle it specifically */

  135.             if (ffm->first_packet || (frame_offset & 0x8000)) {

  136.                 if (!frame_offset) {

  137.                     /* This packet has no frame headers in it */

  138.                     if (avio_tell(pb) >= ffm->packet_size * 3LL) {

  139.                         int64_t seekback = FFMIN(ffm->packet_size * 2LL, avio_tell(pb) - last_pos);

  140.                         seekback = FFMAX(seekback, 0);

  141.                         avio_seek(pb, -seekback, SEEK_CUR);

  142.                         goto retry_read;

  143.                     }

  144.                     /* This is bad, we cannot find a valid frame header */

  145.                     return 0;

  146.                 }

  147.                 ffm->first_packet = 0;

  148.                 if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE) {

  149.                     ffm->packet_end = ffm->packet_ptr;

  150.                     return -1;

  151.                 }

  152.                 ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;

  153.                 if (!header)

  154.                     break;

  155.             } else {

  156.                 ffm->packet_ptr = ffm->packet;

  157.             }

  158.             goto redo;

  159.         }

  160.         memcpy(buf, ffm->packet_ptr, len);

  161.         buf += len;

  162.         ffm->packet_ptr += len;

  163.         size -= len;

  164.         header = 0;

  165.     }

  166.     return size1 - size;

  167. }

  168. 

  169. /* ensure that actual seeking happens between FFM_PACKET_SIZE

  170.    and file_size - FFM_PACKET_SIZE */

  171. static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)

  172. {

  173.     FFMContext *ffm = s->priv_data;

  174.     AVIOContext *pb = s->pb;

  175.     int64_t pos;

  176. 

  177.     pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);

  178.     pos = FFMAX(pos, FFM_PACKET_SIZE);

  179.     ff_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);

  180.     return avio_seek(pb, pos, SEEK_SET);

  181. }

  182. 

  183. static int64_t get_dts(AVFormatContext *s, int64_t pos)

  184. {

  185.     AVIOContext *pb = s->pb;

  186.     int64_t dts;

  187. 

  188.     ffm_seek1(s, pos);

  189.     avio_skip(pb, 4);

  190.     dts = avio_rb64(pb);

  191.     ff_dlog(s, "dts=%0.6f\n", dts / 1000000.0);

  192.     return dts;

  193. }

  194. 

  195. static void adjust_write_index(AVFormatContext *s)

  196. {

  197.     FFMContext *ffm = s->priv_data;

  198.     AVIOContext *pb = s->pb;

  199.     int64_t pts;

  200.     //int64_t orig_write_index = ffm->write_index;

  201.     int64_t pos_min, pos_max;

  202.     int64_t pts_start;

  203.     int64_t ptr = avio_tell(pb);

  204. 

  205. 

  206.     pos_min = 0;

  207.     pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;

  208. 

  209.     pts_start = get_dts(s, pos_min);

  210. 

  211.     pts = get_dts(s, pos_max);

  212. 

  213.     if (pts - 100000 > pts_start)

  214.         goto end;

  215. 

  216.     ffm->write_index = FFM_PACKET_SIZE;

  217. 

  218.     pts_start = get_dts(s, pos_min);

  219. 

  220.     pts = get_dts(s, pos_max);

  221. 

  222.     if (pts - 100000 <= pts_start) {

  223.         while (1) {

  224.             int64_t newpos;

  225.             int64_t newpts;

  226. 

  227.             newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;

  228. 

  229.             if (newpos == pos_min)

  230.                 break;

  231. 

  232.             newpts = get_dts(s, newpos);

  233. 

  234.             if (newpts - 100000 <= pts) {

  235.                 pos_max = newpos;

  236.                 pts = newpts;

  237.             } else {

  238.                 pos_min = newpos;

  239.             }

  240.         }

  241.         ffm->write_index += pos_max;

  242.     }

  243. 

  244.  end:

  245.     avio_seek(pb, ptr, SEEK_SET);

  246. }

  247. 

  248. 

  249. static int ffm_close(AVFormatContext *s)

  250. {

  251.     int i;

  252. 

  253.     for (i = 0; i < s->nb_streams; i++)

  254.         av_freep(&s->streams[i]->codec->rc_eq);

  255. 

  256.     return 0;

  257. }

  258. 

  259. static int ffm_append_recommended_configuration(AVStream *st, char **conf)

  260. {

  261.     int ret;

  262.     size_t newsize;

  263.     av_assert0(conf && st);

  264.     if (!*conf)

  265.         return 0;

  266.     if (!st->recommended_encoder_configuration) {

  267.         st->recommended_encoder_configuration = *conf;

  268.         *conf = 0;

  269.         return 0;

  270.     }

  271.     newsize = strlen(*conf) + strlen(st->recommended_encoder_configuration) + 2;

  272.     if ((ret = av_reallocp(&st->recommended_encoder_configuration, newsize)) < 0)

  273.         return ret;

  274.     av_strlcat(st->recommended_encoder_configuration, ",", newsize);

  275.     av_strlcat(st->recommended_encoder_configuration, *conf, newsize);

  276.     av_freep(conf);

  277.     return 0;

  278. }

  279. 

  280. static int ffm2_read_header(AVFormatContext *s)

  281. {

  282.     FFMContext *ffm = s->priv_data;

  283.     AVStream *st;

  284.     AVIOContext *pb = s->pb;

  285.     AVCodecContext *codec;

  286.     const AVCodecDescriptor *codec_desc;

  287.     int ret, i;

  288.     int f_main = 0, f_cprv = -1, f_stvi = -1, f_stau = -1;

  289.     AVCodec *enc;

  290.     char *buffer;

  291. 

  292.     ffm->packet_size = avio_rb32(pb);

  293.     if (ffm->packet_size != FFM_PACKET_SIZE) {

  294.         av_log(s, AV_LOG_ERROR, "Invalid packet size %d, expected size was %d\n",

  295.                ffm->packet_size, FFM_PACKET_SIZE);

  296.         ret = AVERROR_INVALIDDATA;

  297.         goto fail;

  298.     }

  299. 

  300.     ffm->write_index = avio_rb64(pb);

  301.     /* get also filesize */

  302.     if (pb->seekable) {

  303.         ffm->file_size = avio_size(pb);

  304.         if (ffm->write_index && 0)

  305.             adjust_write_index(s);

  306.     } else {

  307.         ffm->file_size = (UINT64_C(1) << 63) - 1;

  308.     }

  309. 

  310.     while(!avio_feof(pb)) {

  311.         unsigned id = avio_rb32(pb);

  312.         unsigned size = avio_rb32(pb);

  313.         int64_t next = avio_tell(pb) + size;

  314.         char rc_eq_buf[128];

  315. 

  316.         if(!id)

  317.             break;

  318. 

  319.         switch(id) {

  320.         case MKBETAG('M', 'A', 'I', 'N'):

  321.             if (f_main++) {

  322.                 ret = AVERROR(EINVAL);

  323.                 goto fail;

  324.             }

  325.             avio_rb32(pb); /* nb_streams */

  326.             avio_rb32(pb); /* total bitrate */

  327.             break;

  328.         case MKBETAG('C', 'O', 'M', 'M'):

  329.             f_cprv = f_stvi = f_stau = 0;

  330.             st = avformat_new_stream(s, NULL);

  331.             if (!st) {

  332.                 ret = AVERROR(ENOMEM);

  333.                 goto fail;

  334.             }

  335. 

  336.             avpriv_set_pts_info(st, 64, 1, 1000000);

  337. 

  338.             codec = st->codec;

  339.             /* generic info */

  340.             codec->codec_id = avio_rb32(pb);

  341.             codec_desc = avcodec_descriptor_get(codec->codec_id);

  342.             if (!codec_desc) {

  343.                 av_log(s, AV_LOG_ERROR, "Invalid codec id: %d\n", codec->codec_id);

  344.                 codec->codec_id = AV_CODEC_ID_NONE;

  345.                 goto fail;

  346.             }

  347.             codec->codec_type = avio_r8(pb);

  348.             if (codec->codec_type != codec_desc->type) {

  349.                 av_log(s, AV_LOG_ERROR, "Codec type mismatch: expected %d, found %d\n",

  350.                        codec_desc->type, codec->codec_type);

  351.                 codec->codec_id = AV_CODEC_ID_NONE;

  352.                 codec->codec_type = AVMEDIA_TYPE_UNKNOWN;

  353.                 goto fail;

  354.             }

  355.             codec->bit_rate = avio_rb32(pb);

  356.             codec->flags = avio_rb32(pb);

  357.             codec->flags2 = avio_rb32(pb);

  358.             codec->debug = avio_rb32(pb);

  359.             if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {

  360.                 int size = avio_rb32(pb);

  361.                 codec->extradata = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);

  362.                 if (!codec->extradata)

  363.                     return AVERROR(ENOMEM);

  364.                 codec->extradata_size = size;

  365.                 avio_read(pb, codec->extradata, size);

  366.             }

  367.             break;

  368.         case MKBETAG('S', 'T', 'V', 'I'):

  369.             if (f_stvi++) {

  370.                 ret = AVERROR(EINVAL);

  371.                 goto fail;

  372.             }

  373.             codec->time_base.num = avio_rb32(pb);

  374.             codec->time_base.den = avio_rb32(pb);

  375.             if (codec->time_base.num <= 0 || codec->time_base.den <= 0) {

  376.                 av_log(s, AV_LOG_ERROR, "Invalid time base %d/%d\n",

  377.                        codec->time_base.num, codec->time_base.den);

  378.                 ret = AVERROR_INVALIDDATA;

  379.                 goto fail;

  380.             }

  381.             codec->width = avio_rb16(pb);

  382.             codec->height = avio_rb16(pb);

  383.             codec->gop_size = avio_rb16(pb);

  384.             codec->pix_fmt = avio_rb32(pb);

  385.             if (!av_pix_fmt_desc_get(codec->pix_fmt)) {

  386.                 av_log(s, AV_LOG_ERROR, "Invalid pix fmt id: %d\n", codec->pix_fmt);

  387.                 codec->pix_fmt = AV_PIX_FMT_NONE;

  388.                 goto fail;

  389.             }

  390.             codec->qmin = avio_r8(pb);

  391.             codec->qmax = avio_r8(pb);

  392.             codec->max_qdiff = avio_r8(pb);

  393.             codec->qcompress = avio_rb16(pb) / 10000.0;

  394.             codec->qblur = avio_rb16(pb) / 10000.0;

  395.             codec->bit_rate_tolerance = avio_rb32(pb);

  396.             avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));

  397.             codec->rc_eq = av_strdup(rc_eq_buf);

  398.             codec->rc_max_rate = avio_rb32(pb);

  399.             codec->rc_min_rate = avio_rb32(pb);

  400.             codec->rc_buffer_size = avio_rb32(pb);

  401.             codec->i_quant_factor = av_int2double(avio_rb64(pb));

  402.             codec->b_quant_factor = av_int2double(avio_rb64(pb));

  403.             codec->i_quant_offset = av_int2double(avio_rb64(pb));

  404.             codec->b_quant_offset = av_int2double(avio_rb64(pb));

  405.             codec->dct_algo = avio_rb32(pb);

  406.             codec->strict_std_compliance = avio_rb32(pb);

  407.             codec->max_b_frames = avio_rb32(pb);

  408.             codec->mpeg_quant = avio_rb32(pb);

  409.             codec->intra_dc_precision = avio_rb32(pb);

  410.             codec->me_method = avio_rb32(pb);

  411.             codec->mb_decision = avio_rb32(pb);

  412.             codec->nsse_weight = avio_rb32(pb);

  413.             codec->frame_skip_cmp = avio_rb32(pb);

  414.             codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));

  415.             codec->codec_tag = avio_rb32(pb);

  416.             codec->thread_count = avio_r8(pb);

  417.             codec->coder_type = avio_rb32(pb);

  418.             codec->me_cmp = avio_rb32(pb);

  419.             codec->me_subpel_quality = avio_rb32(pb);

  420.             codec->me_range = avio_rb32(pb);

  421.             codec->keyint_min = avio_rb32(pb);

  422.             codec->scenechange_threshold = avio_rb32(pb);

  423.             codec->b_frame_strategy = avio_rb32(pb);

  424.             codec->qcompress = av_int2double(avio_rb64(pb));

  425.             codec->qblur = av_int2double(avio_rb64(pb));

  426.             codec->max_qdiff = avio_rb32(pb);

  427.             codec->refs = avio_rb32(pb);

  428.             break;

  429.         case MKBETAG('S', 'T', 'A', 'U'):

  430.             if (f_stau++) {

  431.                 ret = AVERROR(EINVAL);

  432.                 goto fail;

  433.             }

  434.             codec->sample_rate = avio_rb32(pb);

  435.             if (codec->sample_rate <= 0) {

  436.                 av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", codec->sample_rate);

  437.                 ret = AVERROR_INVALIDDATA;

  438.                 goto fail;

  439.             }

  440.             codec->channels = avio_rl16(pb);

  441.             codec->frame_size = avio_rl16(pb);

  442.             break;

  443.         case MKBETAG('C', 'P', 'R', 'V'):

  444.             if (f_cprv++) {

  445.                 ret = AVERROR(EINVAL);

  446.                 goto fail;

  447.             }

  448.             enc = avcodec_find_encoder(codec->codec_id);

  449.             if (enc && enc->priv_data_size && enc->priv_class) {

  450.                 buffer = av_malloc(size + 1);

  451.                 if (!buffer) {

  452.                     ret = AVERROR(ENOMEM);

  453.                     goto fail;

  454.                 }

  455.                 avio_get_str(pb, size, buffer, size + 1);

  456.                 if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)

  457.                     goto fail;

  458.             }

  459.             break;

  460.         case MKBETAG('S', '2', 'V', 'I'):

  461.             if (f_stvi++ || !size) {

  462.                 ret = AVERROR(EINVAL);

  463.                 goto fail;

  464.             }

  465.             buffer = av_malloc(size);

  466.             if (!buffer) {

  467.                 ret = AVERROR(ENOMEM);

  468.                 goto fail;

  469.             }

  470.             avio_get_str(pb, INT_MAX, buffer, size);

  471.             av_set_options_string(codec, buffer, "=", ",");

  472.             if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)

  473.                 goto fail;

  474.             break;

  475.         case MKBETAG('S', '2', 'A', 'U'):

  476.             if (f_stau++ || !size) {

  477.                 ret = AVERROR(EINVAL);

  478.                 goto fail;

  479.             }

  480.             buffer = av_malloc(size);

  481.             if (!buffer) {

  482.                 ret = AVERROR(ENOMEM);

  483.                 goto fail;

  484.             }

  485.             avio_get_str(pb, INT_MAX, buffer, size);

  486.             av_set_options_string(codec, buffer, "=", ",");

  487.             if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)

  488.                 goto fail;

  489.             break;

  490.         }

  491.         avio_seek(pb, next, SEEK_SET);

  492.     }

  493. 

  494.     for (i = 0; i < s->nb_streams; i++)

  495.         avcodec_parameters_from_context(s->streams[i]->codecpar, s->streams[i]->codec);

  496. 

  497.     /* get until end of block reached */

  498.     while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)

  499.         avio_r8(pb);

  500. 

  501.     /* init packet demux */

  502.     ffm->packet_ptr = ffm->packet;

  503.     ffm->packet_end = ffm->packet;

  504.     ffm->frame_offset = 0;

  505.     ffm->dts = 0;

  506.     ffm->read_state = READ_HEADER;

  507.     ffm->first_packet = 1;

  508.     return 0;

  509.  fail:

  510.     ffm_close(s);

  511.     return ret;

  512. }

  513. 

  514. static int ffm_read_header(AVFormatContext *s)

  515. {

  516.     FFMContext *ffm = s->priv_data;

  517.     AVStream *st;

  518.     AVIOContext *pb = s->pb;

  519.     AVCodecContext *codec;

  520.     const AVCodecDescriptor *codec_desc;

  521.     int i, nb_streams;

  522.     uint32_t tag;

  523. 

  524.     /* header */

  525.     tag = avio_rl32(pb);

  526.     if (tag == MKTAG('F', 'F', 'M', '2'))

  527.         return ffm2_read_header(s);

  528.     if (tag != MKTAG('F', 'F', 'M', '1'))

  529.         goto fail;

  530.     ffm->packet_size = avio_rb32(pb);

  531.     if (ffm->packet_size != FFM_PACKET_SIZE)

  532.         goto fail;

  533.     ffm->write_index = avio_rb64(pb);

  534.     /* get also filesize */

  535.     if (pb->seekable) {

  536.         ffm->file_size = avio_size(pb);

  537.         if (ffm->write_index && 0)

  538.             adjust_write_index(s);

  539.     } else {

  540.         ffm->file_size = (UINT64_C(1) << 63) - 1;

  541.     }

  542. 

  543.     nb_streams = avio_rb32(pb);

  544.     avio_rb32(pb); /* total bitrate */

  545.     /* read each stream */

  546.     for(i=0;i<nb_streams;i++) {

  547.         char rc_eq_buf[128];

  548. 

  549.         st = avformat_new_stream(s, NULL);

  550.         if (!st)

  551.             goto fail;

  552. 

  553.         avpriv_set_pts_info(st, 64, 1, 1000000);

  554. 

  555.         codec = st->codec;

  556.         /* generic info */

  557.         codec->codec_id = avio_rb32(pb);

  558.         codec_desc = avcodec_descriptor_get(codec->codec_id);

  559.         if (!codec_desc) {

  560.             av_log(s, AV_LOG_ERROR, "Invalid codec id: %d\n", codec->codec_id);

  561.             codec->codec_id = AV_CODEC_ID_NONE;

  562.             goto fail;

  563.         }

  564.         codec->codec_type = avio_r8(pb); /* codec_type */

  565.         if (codec->codec_type != codec_desc->type) {

  566.             av_log(s, AV_LOG_ERROR, "Codec type mismatch: expected %d, found %d\n",

  567.                    codec_desc->type, codec->codec_type);

  568.             codec->codec_id = AV_CODEC_ID_NONE;

  569.             codec->codec_type = AVMEDIA_TYPE_UNKNOWN;

  570.             goto fail;

  571.         }

  572.         codec->bit_rate = avio_rb32(pb);

  573.         codec->flags = avio_rb32(pb);

  574.         codec->flags2 = avio_rb32(pb);

  575.         codec->debug = avio_rb32(pb);

  576.         /* specific info */

  577.         switch(codec->codec_type) {

  578.         case AVMEDIA_TYPE_VIDEO:

  579.             codec->time_base.num = avio_rb32(pb);

  580.             codec->time_base.den = avio_rb32(pb);

  581.             if (codec->time_base.num <= 0 || codec->time_base.den <= 0) {

  582.                 av_log(s, AV_LOG_ERROR, "Invalid time base %d/%d\n",

  583.                        codec->time_base.num, codec->time_base.den);

  584.                 goto fail;

  585.             }

  586.             codec->width = avio_rb16(pb);

  587.             codec->height = avio_rb16(pb);

  588.             codec->gop_size = avio_rb16(pb);

  589.             codec->pix_fmt = avio_rb32(pb);

  590.             if (!av_pix_fmt_desc_get(codec->pix_fmt)) {

  591.                 av_log(s, AV_LOG_ERROR, "Invalid pix fmt id: %d\n", codec->pix_fmt);

  592.                 codec->pix_fmt = AV_PIX_FMT_NONE;

  593.                 goto fail;

  594.             }

  595.             codec->qmin = avio_r8(pb);

  596.             codec->qmax = avio_r8(pb);

  597.             codec->max_qdiff = avio_r8(pb);

  598.             codec->qcompress = avio_rb16(pb) / 10000.0;

  599.             codec->qblur = avio_rb16(pb) / 10000.0;

  600.             codec->bit_rate_tolerance = avio_rb32(pb);

  601.             avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));

  602.             codec->rc_eq = av_strdup(rc_eq_buf);

  603.             codec->rc_max_rate = avio_rb32(pb);

  604.             codec->rc_min_rate = avio_rb32(pb);

  605.             codec->rc_buffer_size = avio_rb32(pb);

  606.             codec->i_quant_factor = av_int2double(avio_rb64(pb));

  607.             codec->b_quant_factor = av_int2double(avio_rb64(pb));

  608.             codec->i_quant_offset = av_int2double(avio_rb64(pb));

  609.             codec->b_quant_offset = av_int2double(avio_rb64(pb));

  610.             codec->dct_algo = avio_rb32(pb);

  611.             codec->strict_std_compliance = avio_rb32(pb);

  612.             codec->max_b_frames = avio_rb32(pb);

  613.             codec->mpeg_quant = avio_rb32(pb);

  614.             codec->intra_dc_precision = avio_rb32(pb);

  615.             codec->me_method = avio_rb32(pb);

  616.             codec->mb_decision = avio_rb32(pb);

  617.             codec->nsse_weight = avio_rb32(pb);

  618.             codec->frame_skip_cmp = avio_rb32(pb);

  619.             codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));

  620.             codec->codec_tag = avio_rb32(pb);

  621.             codec->thread_count = avio_r8(pb);

  622.             codec->coder_type = avio_rb32(pb);

  623.             codec->me_cmp = avio_rb32(pb);

  624.             codec->me_subpel_quality = avio_rb32(pb);

  625.             codec->me_range = avio_rb32(pb);

  626.             codec->keyint_min = avio_rb32(pb);

  627.             codec->scenechange_threshold = avio_rb32(pb);

  628.             codec->b_frame_strategy = avio_rb32(pb);

  629.             codec->qcompress = av_int2double(avio_rb64(pb));

  630.             codec->qblur = av_int2double(avio_rb64(pb));

  631.             codec->max_qdiff = avio_rb32(pb);

  632.             codec->refs = avio_rb32(pb);

  633.             break;

  634.         case AVMEDIA_TYPE_AUDIO:

  635.             codec->sample_rate = avio_rb32(pb);

  636.             if (codec->sample_rate <= 0) {

  637.                 av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", codec->sample_rate);

  638.                 goto fail;

  639.             }

  640.             codec->channels = avio_rl16(pb);

  641.             codec->frame_size = avio_rl16(pb);

  642.             break;

  643.         default:

  644.             goto fail;

  645.         }

  646.         if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {

  647.             int size = avio_rb32(pb);

  648.             codec->extradata = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);

  649.             if (!codec->extradata)

  650.                 return AVERROR(ENOMEM);

  651.             codec->extradata_size = size;

  652.             avio_read(pb, codec->extradata, size);

  653.         }

  654. 

  655.         avcodec_parameters_from_context(st->codecpar, codec);

  656.     }

  657. 

  658.     /* get until end of block reached */

  659.     while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)

  660.         avio_r8(pb);

  661. 

  662.     /* init packet demux */

  663.     ffm->packet_ptr = ffm->packet;

  664.     ffm->packet_end = ffm->packet;

  665.     ffm->frame_offset = 0;

  666.     ffm->dts = 0;

  667.     ffm->read_state = READ_HEADER;

  668.     ffm->first_packet = 1;

  669.     return 0;

  670.  fail:

  671.     ffm_close(s);

  672.     return -1;

  673. }

  674. 

  675. /* return < 0 if eof */

  676. static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)

  677. {

  678.     int size;

  679.     FFMContext *ffm = s->priv_data;

  680.     int duration, ret;

  681. 

  682.     switch(ffm->read_state) {

  683.     case READ_HEADER:

  684.         if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)

  685.             return ret;

  686. 

  687.         ff_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",

  688.                avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);

  689.         if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=

  690.             FRAME_HEADER_SIZE)

  691.             return -1;

  692.         if (ffm->header[1] & FLAG_DTS)

  693.             if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)

  694.                 return -1;

  695.         ffm->read_state = READ_DATA;

  696.         /* fall through */

  697.     case READ_DATA:

  698.         size = AV_RB24(ffm->header + 2);

  699.         if ((ret = ffm_is_avail_data(s, size)) < 0)

  700.             return ret;

  701. 

  702.         duration = AV_RB24(ffm->header + 5);

  703. 

  704.         if (av_new_packet(pkt, size) < 0) {

  705.             return AVERROR(ENOMEM);

  706.         }

  707.         pkt->stream_index = ffm->header[0];

  708.         if ((unsigned)pkt->stream_index >= s->nb_streams) {

  709.             av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);

  710.             av_packet_unref(pkt);

  711.             ffm->read_state = READ_HEADER;

  712.             return -1;

  713.         }

  714.         pkt->pos = avio_tell(s->pb);

  715.         if (ffm->header[1] & FLAG_KEY_FRAME)

  716.             pkt->flags |= AV_PKT_FLAG_KEY;

  717. 

  718.         ffm->read_state = READ_HEADER;

  719.         if (ffm_read_data(s, pkt->data, size, 0) != size) {

  720.             /* bad case: desynchronized packet. we cancel all the packet loading */

  721.             av_packet_unref(pkt);

  722.             return -1;

  723.         }

  724.         pkt->pts = AV_RB64(ffm->header+8);

  725.         if (ffm->header[1] & FLAG_DTS)

  726.             pkt->dts = pkt->pts - AV_RB32(ffm->header+16);

  727.         else

  728.             pkt->dts = pkt->pts;

  729.         pkt->duration = duration;

  730.         break;

  731.     }

  732.     return 0;

  733. }

  734. 

  735. /* seek to a given time in the file. The file read pointer is

  736.    positioned at or before pts. XXX: the following code is quite

  737.    approximative */

  738. static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)

  739. {

  740.     FFMContext *ffm = s->priv_data;

  741.     int64_t pos_min, pos_max, pos;

  742.     int64_t pts_min, pts_max, pts;

  743.     double pos1;

  744. 

  745.     ff_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);

  746.     /* find the position using linear interpolation (better than

  747.        dichotomy in typical cases) */

  748.     if (ffm->write_index && ffm->write_index < ffm->file_size) {

  749.         if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) {

  750.             pos_min = FFM_PACKET_SIZE;

  751.             pos_max = ffm->write_index - FFM_PACKET_SIZE;

  752.         } else {

  753.             pos_min = ffm->write_index;

  754.             pos_max = ffm->file_size - FFM_PACKET_SIZE;

  755.         }

  756.     } else {

  757.         pos_min = FFM_PACKET_SIZE;

  758.         pos_max = ffm->file_size - FFM_PACKET_SIZE;

  759.     }

  760.     while (pos_min <= pos_max) {

  761.         pts_min = get_dts(s, pos_min);

  762.         pts_max = get_dts(s, pos_max);

  763.         if (pts_min > wanted_pts || pts_max <= wanted_pts) {

  764.             pos = pts_min > wanted_pts ? pos_min : pos_max;

  765.             goto found;

  766.         }

  767.         /* linear interpolation */

  768.         pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /

  769.             (double)(pts_max - pts_min);

  770.         pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;

  771.         if (pos <= pos_min)

  772.             pos = pos_min;

  773.         else if (pos >= pos_max)

  774.             pos = pos_max;

  775.         pts = get_dts(s, pos);

  776.         /* check if we are lucky */

  777.         if (pts == wanted_pts) {

  778.             goto found;

  779.         } else if (pts > wanted_pts) {

  780.             pos_max = pos - FFM_PACKET_SIZE;

  781.         } else {

  782.             pos_min = pos + FFM_PACKET_SIZE;

  783.         }

  784.     }

  785.     pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;

  786. 

  787.  found:

  788.     if (ffm_seek1(s, pos) < 0)

  789.         return -1;

  790. 

  791.     /* reset read state */

  792.     ffm->read_state = READ_HEADER;

  793.     ffm->packet_ptr = ffm->packet;

  794.     ffm->packet_end = ffm->packet;

  795.     ffm->first_packet = 1;

  796. 

  797.     return 0;

  798. }

  799. 

  800. static int ffm_probe(AVProbeData *p)

  801. {

  802.     if (

  803.         p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&

  804.         (p->buf[3] == '1' || p->buf[3] == '2'))

  805.         return AVPROBE_SCORE_MAX + 1;

  806.     return 0;

  807. }

  808. 

  809. static const AVOption options[] = {

  810.     {"server_attached", NULL, offsetof(FFMContext, server_attached), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_EXPORT },

  811.     {"ffm_write_index", NULL, offsetof(FFMContext, write_index), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, AV_OPT_FLAG_EXPORT },

  812.     {"ffm_file_size", NULL, offsetof(FFMContext, file_size), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, AV_OPT_FLAG_EXPORT },

  813.     { NULL },

  814. };

  815. 

  816. static const AVClass ffm_class = {

  817.     .class_name = "ffm demuxer",

  818.     .item_name  = av_default_item_name,

  819.     .option     = options,

  820.     .version    = LIBAVUTIL_VERSION_INT,

  821. };

  822. AVInputFormat ff_ffm_demuxer = {

  823.     .name           = "ffm",

  824.     .long_name      = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),

  825.     .priv_data_size = sizeof(FFMContext),

  826.     .read_probe     = ffm_probe,

  827.     .read_header    = ffm_read_header,

  828.     .read_packet    = ffm_read_packet,

  829.     .read_close     = ffm_close,

  830.     .read_seek      = ffm_seek,

  831.     .priv_class     = &ffm_class,

  832. };