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  1. /*
  2.  * RIFF demuxing functions and data
  3.  * Copyright (c) 2000 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 "libavutil/dict.h"
  23. #include "libavutil/error.h"
  24. #include "libavutil/log.h"
  25. #include "libavutil/mathematics.h"
  26. #include "libavcodec/avcodec.h"
  27. #include "libavcodec/bytestream.h"
  28. #include "avformat.h"
  29. #include "avio_internal.h"
  30. #include "riff.h"
  31.  
  32. const AVCodecGuid ff_codec_wav_guids[] = {
  33.     { AV_CODEC_ID_AC3,      { 0x2C, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
  34.     { AV_CODEC_ID_ATRAC3P,  { 0xBF, 0xAA, 0x23, 0xE9, 0x58, 0xCB, 0x71, 0x44, 0xA1, 0x19, 0xFF, 0xFA, 0x01, 0xE4, 0xCE, 0x62 } },
  35.     { AV_CODEC_ID_EAC3,     { 0xAF, 0x87, 0xFB, 0xA7, 0x02, 0x2D, 0xFB, 0x42, 0xA4, 0xD4, 0x05, 0xCD, 0x93, 0x84, 0x3B, 0xDD } },
  36.     { AV_CODEC_ID_MP2,      { 0x2B, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
  37.     { AV_CODEC_ID_NONE }
  38. };
  39.  
  40. void ff_get_guid(AVIOContext *s, ff_asf_guid *g)
  41. {
  42.     av_assert0(sizeof(*g) == 16); //compiler will optimize this out
  43.     if (avio_read(s, *g, sizeof(*g)) < (int)sizeof(*g))
  44.         memset(*g, 0, sizeof(*g));
  45. }
  46.  
  47. enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
  48. {
  49.     int i;
  50.     for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
  51.         if (!ff_guidcmp(guids[i].guid, guid))
  52.             return guids[i].id;
  53.     return AV_CODEC_ID_NONE;
  54. }
  55.  
  56. /* We could be given one of the three possible structures here:
  57.  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
  58.  * is an expansion of the previous one with the fields added
  59.  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
  60.  * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
  61.  * an openended structure.
  62.  */
  63.  
  64. static void parse_waveformatex(AVIOContext *pb, AVCodecContext *c)
  65. {
  66.     ff_asf_guid subformat;
  67.     int bps = avio_rl16(pb);
  68.     if (bps)
  69.         c->bits_per_coded_sample = bps;
  70.  
  71.     c->channel_layout        = avio_rl32(pb); /* dwChannelMask */
  72.  
  73.     ff_get_guid(pb, &subformat);
  74.     if (!memcmp(subformat + 4,
  75.                 (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
  76.         c->codec_tag = AV_RL32(subformat);
  77.         c->codec_id  = ff_wav_codec_get_id(c->codec_tag,
  78.                                            c->bits_per_coded_sample);
  79.     } else {
  80.         c->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
  81.         if (!c->codec_id)
  82.             av_log(c, AV_LOG_WARNING,
  83.                    "unknown subformat:"FF_PRI_GUID"\n",
  84.                    FF_ARG_GUID(subformat));
  85.     }
  86. }
  87.  
  88. int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
  89. {
  90.     int id;
  91.  
  92.     id                 = avio_rl16(pb);
  93.     codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  94.     codec->channels    = avio_rl16(pb);
  95.     codec->sample_rate = avio_rl32(pb);
  96.     codec->bit_rate    = avio_rl32(pb) * 8;
  97.     codec->block_align = avio_rl16(pb);
  98.     if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
  99.         codec->bits_per_coded_sample = 8;
  100.     } else
  101.         codec->bits_per_coded_sample = avio_rl16(pb);
  102.     if (id == 0xFFFE) {
  103.         codec->codec_tag = 0;
  104.     } else {
  105.         codec->codec_tag = id;
  106.         codec->codec_id  = ff_wav_codec_get_id(id,
  107.                                                codec->bits_per_coded_sample);
  108.     }
  109.     if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */
  110.         int cbSize = avio_rl16(pb); /* cbSize */
  111.         size  -= 18;
  112.         cbSize = FFMIN(size, cbSize);
  113.         if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
  114.             parse_waveformatex(pb, codec);
  115.             cbSize -= 22;
  116.             size   -= 22;
  117.         }
  118.         if (cbSize > 0) {
  119.             av_free(codec->extradata);
  120.             if (ff_alloc_extradata(codec, cbSize))
  121.                 return AVERROR(ENOMEM);
  122.             avio_read(pb, codec->extradata, codec->extradata_size);
  123.             size -= cbSize;
  124.         }
  125.  
  126.         /* It is possible for the chunk to contain garbage at the end */
  127.         if (size > 0)
  128.             avio_skip(pb, size);
  129.     }
  130.     if (codec->sample_rate <= 0) {
  131.         av_log(NULL, AV_LOG_ERROR,
  132.                "Invalid sample rate: %d\n", codec->sample_rate);
  133.         return AVERROR_INVALIDDATA;
  134.     }
  135.     if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
  136.         /* Channels and sample_rate values are those prior to applying SBR
  137.          * and/or PS. */
  138.         codec->channels    = 0;
  139.         codec->sample_rate = 0;
  140.     }
  141.     /* override bits_per_coded_sample for G.726 */
  142.     if (codec->codec_id == AV_CODEC_ID_ADPCM_G726 && codec->sample_rate)
  143.         codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
  144.  
  145.     return 0;
  146. }
  147.  
  148. enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
  149. {
  150.     enum AVCodecID id;
  151.     id = ff_codec_get_id(ff_codec_wav_tags, tag);
  152.     if (id <= 0)
  153.         return id;
  154.  
  155.     if (id == AV_CODEC_ID_PCM_S16LE)
  156.         id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
  157.     else if (id == AV_CODEC_ID_PCM_F32LE)
  158.         id = ff_get_pcm_codec_id(bps, 1, 0,  0);
  159.  
  160.     if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
  161.         id = AV_CODEC_ID_PCM_ZORK;
  162.     return id;
  163. }
  164.  
  165. int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
  166. {
  167.     int tag1;
  168.     if(esize) *esize  = avio_rl32(pb);
  169.     else                avio_rl32(pb);
  170.     st->codec->width  = avio_rl32(pb);
  171.     st->codec->height = (int32_t)avio_rl32(pb);
  172.     avio_rl16(pb); /* planes */
  173.     st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
  174.     tag1                             = avio_rl32(pb);
  175.     avio_rl32(pb); /* ImageSize */
  176.     avio_rl32(pb); /* XPelsPerMeter */
  177.     avio_rl32(pb); /* YPelsPerMeter */
  178.     avio_rl32(pb); /* ClrUsed */
  179.     avio_rl32(pb); /* ClrImportant */
  180.     return tag1;
  181. }
  182.  
  183. int ff_read_riff_info(AVFormatContext *s, int64_t size)
  184. {
  185.     int64_t start, end, cur;
  186.     AVIOContext *pb = s->pb;
  187.  
  188.     start = avio_tell(pb);
  189.     end   = start + size;
  190.  
  191.     while ((cur = avio_tell(pb)) >= 0 &&
  192.            cur <= end - 8 /* = tag + size */) {
  193.         uint32_t chunk_code;
  194.         int64_t chunk_size;
  195.         char key[5] = { 0 };
  196.         char *value;
  197.  
  198.         chunk_code = avio_rl32(pb);
  199.         chunk_size = avio_rl32(pb);
  200.         if (url_feof(pb)) {
  201.             if (chunk_code || chunk_size) {
  202.                 av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
  203.                 return AVERROR_INVALIDDATA;
  204.             }
  205.             return AVERROR_EOF;
  206.         }
  207.         if (chunk_size > end ||
  208.             end - chunk_size < cur ||
  209.             chunk_size == UINT_MAX) {
  210.             avio_seek(pb, -9, SEEK_CUR);
  211.             chunk_code = avio_rl32(pb);
  212.             chunk_size = avio_rl32(pb);
  213.             if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
  214.                 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
  215.                 return AVERROR_INVALIDDATA;
  216.             }
  217.         }
  218.  
  219.         chunk_size += (chunk_size & 1);
  220.  
  221.         if (!chunk_code) {
  222.             if (chunk_size)
  223.                 avio_skip(pb, chunk_size);
  224.             else if (pb->eof_reached) {
  225.                 av_log(s, AV_LOG_WARNING, "truncated file\n");
  226.                 return AVERROR_EOF;
  227.             }
  228.             continue;
  229.         }
  230.  
  231.         value = av_mallocz(chunk_size + 1);
  232.         if (!value) {
  233.             av_log(s, AV_LOG_ERROR,
  234.                    "out of memory, unable to read INFO tag\n");
  235.             return AVERROR(ENOMEM);
  236.         }
  237.  
  238.         AV_WL32(key, chunk_code);
  239.  
  240.         if (avio_read(pb, value, chunk_size) != chunk_size) {
  241.             av_log(s, AV_LOG_WARNING,
  242.                    "premature end of file while reading INFO tag\n");
  243.         }
  244.  
  245.         av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
  246.     }
  247.  
  248.     return 0;
  249. }
  250.