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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;

  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.                 if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)

  361.                     return AVERROR(ENOMEM);

  362.             }

  363.             break;

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

  365.             if (f_stvi++ || codec->codec_type != AVMEDIA_TYPE_VIDEO) {

  366.                 ret = AVERROR(EINVAL);

  367.                 goto fail;

  368.             }

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

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

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

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

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

  374.                 ret = AVERROR_INVALIDDATA;

  375.                 goto fail;

  376.             }

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

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

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

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

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

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

  383.                 codec->pix_fmt = AV_PIX_FMT_NONE;

  384.                 goto fail;

  385.             }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  424.             break;

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

  426.             if (f_stau++ || codec->codec_type != AVMEDIA_TYPE_AUDIO) {

  427.                 ret = AVERROR(EINVAL);

  428.                 goto fail;

  429.             }

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

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

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

  433.             break;

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

  435.             if (f_cprv++) {

  436.                 ret = AVERROR(EINVAL);

  437.                 goto fail;

  438.             }

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

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

  441.                 buffer = av_malloc(size + 1);

  442.                 if (!buffer) {

  443.                     ret = AVERROR(ENOMEM);

  444.                     goto fail;

  445.                 }

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

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

  448.                     goto fail;

  449.             }

  450.             break;

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

  452.             if (f_stvi++ || !size || codec->codec_type != AVMEDIA_TYPE_VIDEO) {

  453.                 ret = AVERROR(EINVAL);

  454.                 goto fail;

  455.             }

  456.             buffer = av_malloc(size);

  457.             if (!buffer) {

  458.                 ret = AVERROR(ENOMEM);

  459.                 goto fail;

  460.             }

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

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

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

  464.                 goto fail;

  465.             break;

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

  467.             if (f_stau++ || !size || codec->codec_type != AVMEDIA_TYPE_AUDIO) {

  468.                 ret = AVERROR(EINVAL);

  469.                 goto fail;

  470.             }

  471.             buffer = av_malloc(size);

  472.             if (!buffer) {

  473.                 ret = AVERROR(ENOMEM);

  474.                 goto fail;

  475.             }

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

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

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

  479.                 goto fail;

  480.             break;

  481.         }

  482.         avio_seek(pb, next, SEEK_SET);

  483.     }

  484. 

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

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

  487.         avio_r8(pb);

  488. 

  489.     /* init packet demux */

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

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

  492.     ffm->frame_offset = 0;

  493.     ffm->dts = 0;

  494.     ffm->read_state = READ_HEADER;

  495.     ffm->first_packet = 1;

  496.     return 0;

  497.  fail:

  498.     ffm_close(s);

  499.     return ret;

  500. }

  501. 

  502. static int ffm_read_header(AVFormatContext *s)

  503. {

  504.     FFMContext *ffm = s->priv_data;

  505.     AVStream *st;

  506.     AVIOContext *pb = s->pb;

  507.     AVCodecContext *codec;

  508.     const AVCodecDescriptor *codec_desc;

  509.     int i, nb_streams;

  510.     uint32_t tag;

  511. 

  512.     /* header */

  513.     tag = avio_rl32(pb);

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

  515.         return ffm2_read_header(s);

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

  517.         goto fail;

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

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

  520.         goto fail;

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

  522.     /* get also filesize */

  523.     if (pb->seekable) {

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

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

  526.             adjust_write_index(s);

  527.     } else {

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

  529.     }

  530. 

  531.     nb_streams = avio_rb32(pb);

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

  533.     /* read each stream */

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

  535.         char rc_eq_buf[128];

  536. 

  537.         st = avformat_new_stream(s, NULL);

  538.         if (!st)

  539.             goto fail;

  540. 

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

  542. 

  543.         codec = st->codec;

  544.         /* generic info */

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

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

  547.         if (!codec_desc) {

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

  549.             codec->codec_id = AV_CODEC_ID_NONE;

  550.             goto fail;

  551.         }

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

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

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

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

  556.             codec->codec_id = AV_CODEC_ID_NONE;

  557.             codec->codec_type = AVMEDIA_TYPE_UNKNOWN;

  558.             goto fail;

  559.         }

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

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

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

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

  564.         /* specific info */

  565.         switch(codec->codec_type) {

  566.         case AVMEDIA_TYPE_VIDEO:

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

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

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

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

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

  572.                 goto fail;

  573.             }

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

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

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

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

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

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

  580.                 codec->pix_fmt = AV_PIX_FMT_NONE;

  581.                 goto fail;

  582.             }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  621.             break;

  622.         case AVMEDIA_TYPE_AUDIO:

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

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

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

  626.             break;

  627.         default:

  628.             goto fail;

  629.         }

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

  631.             if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)

  632.                 return AVERROR(ENOMEM);

  633.         }

  634.     }

  635. 

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

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

  638.         avio_r8(pb);

  639. 

  640.     /* init packet demux */

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

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

  643.     ffm->frame_offset = 0;

  644.     ffm->dts = 0;

  645.     ffm->read_state = READ_HEADER;

  646.     ffm->first_packet = 1;

  647.     return 0;

  648.  fail:

  649.     ffm_close(s);

  650.     return -1;

  651. }

  652. 

  653. /* return < 0 if eof */

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

  655. {

  656.     int size;

  657.     FFMContext *ffm = s->priv_data;

  658.     int duration, ret;

  659. 

  660.     switch(ffm->read_state) {

  661.     case READ_HEADER:

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

  663.             return ret;

  664. 

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

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

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

  668.             FRAME_HEADER_SIZE)

  669.             return -1;

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

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

  672.                 return -1;

  673.         ffm->read_state = READ_DATA;

  674.         /* fall through */

  675.     case READ_DATA:

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

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

  678.             return ret;

  679. 

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

  681. 

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

  683.             return AVERROR(ENOMEM);

  684.         }

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

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

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

  688.             av_packet_unref(pkt);

  689.             ffm->read_state = READ_HEADER;

  690.             return -1;

  691.         }

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

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

  694.             pkt->flags |= AV_PKT_FLAG_KEY;

  695. 

  696.         ffm->read_state = READ_HEADER;

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

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

  699.             av_packet_unref(pkt);

  700.             return -1;

  701.         }

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

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

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

  705.         else

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

  707.         pkt->duration = duration;

  708.         break;

  709.     }

  710.     return 0;

  711. }

  712. 

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

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

  715.    approximative */

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

  717. {

  718.     FFMContext *ffm = s->priv_data;

  719.     int64_t pos_min, pos_max, pos;

  720.     int64_t pts_min, pts_max, pts;

  721.     double pos1;

  722. 

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

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

  725.        dichotomy in typical cases) */

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

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

  728.             pos_min = FFM_PACKET_SIZE;

  729.             pos_max = ffm->write_index - FFM_PACKET_SIZE;

  730.         } else {

  731.             pos_min = ffm->write_index;

  732.             pos_max = ffm->file_size - FFM_PACKET_SIZE;

  733.         }

  734.     } else {

  735.         pos_min = FFM_PACKET_SIZE;

  736.         pos_max = ffm->file_size - FFM_PACKET_SIZE;

  737.     }

  738.     while (pos_min <= pos_max) {

  739.         pts_min = get_dts(s, pos_min);

  740.         pts_max = get_dts(s, pos_max);

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

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

  743.             goto found;

  744.         }

  745.         /* linear interpolation */

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

  747.             (double)(pts_max - pts_min);

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

  749.         if (pos <= pos_min)

  750.             pos = pos_min;

  751.         else if (pos >= pos_max)

  752.             pos = pos_max;

  753.         pts = get_dts(s, pos);

  754.         /* check if we are lucky */

  755.         if (pts == wanted_pts) {

  756.             goto found;

  757.         } else if (pts > wanted_pts) {

  758.             pos_max = pos - FFM_PACKET_SIZE;

  759.         } else {

  760.             pos_min = pos + FFM_PACKET_SIZE;

  761.         }

  762.     }

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

  764. 

  765.  found:

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

  767.         return -1;

  768. 

  769.     /* reset read state */

  770.     ffm->read_state = READ_HEADER;

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

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

  773.     ffm->first_packet = 1;

  774. 

  775.     return 0;

  776. }

  777. 

  778. static int ffm_probe(AVProbeData *p)

  779. {

  780.     if (

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

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

  783.         return AVPROBE_SCORE_MAX + 1;

  784.     return 0;

  785. }

  786. 

  787. static const AVOption options[] = {

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

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

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

  791.     { NULL },

  792. };

  793. 

  794. static const AVClass ffm_class = {

  795.     .class_name = "ffm demuxer",

  796.     .item_name  = av_default_item_name,

  797.     .option     = options,

  798.     .version    = LIBAVUTIL_VERSION_INT,

  799. };

  800. AVInputFormat ff_ffm_demuxer = {

  801.     .name           = "ffm",

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

  803.     .priv_data_size = sizeof(FFMContext),

  804.     .read_probe     = ffm_probe,

  805.     .read_header    = ffm_read_header,

  806.     .read_packet    = ffm_read_packet,

  807.     .read_close     = ffm_close,

  808.     .read_seek      = ffm_seek,

  809.     .priv_class     = &ffm_class,

  810. };