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  1. /*
  2.  * Raw FLAC 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 "libavcodec/flac.h"
  23. #include "avformat.h"
  24. #include "flac_picture.h"
  25. #include "internal.h"
  26. #include "rawdec.h"
  27. #include "oggdec.h"
  28. #include "vorbiscomment.h"
  29. #include "libavcodec/bytestream.h"
  30.  
  31. static int flac_read_header(AVFormatContext *s)
  32. {
  33.     int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
  34.     uint8_t header[4];
  35.     uint8_t *buffer=NULL;
  36.     AVStream *st = avformat_new_stream(s, NULL);
  37.     if (!st)
  38.         return AVERROR(ENOMEM);
  39.     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  40.     st->codec->codec_id = AV_CODEC_ID_FLAC;
  41.     st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
  42.     /* the parameters will be extracted from the compressed bitstream */
  43.  
  44.     /* if fLaC marker is not found, assume there is no header */
  45.     if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) {
  46.         avio_seek(s->pb, -4, SEEK_CUR);
  47.         return 0;
  48.     }
  49.  
  50.     /* process metadata blocks */
  51.     while (!url_feof(s->pb) && !metadata_last) {
  52.         avio_read(s->pb, header, 4);
  53.         avpriv_flac_parse_block_header(header, &metadata_last, &metadata_type,
  54.                                    &metadata_size);
  55.         switch (metadata_type) {
  56.         /* allocate and read metadata block for supported types */
  57.         case FLAC_METADATA_TYPE_STREAMINFO:
  58.         case FLAC_METADATA_TYPE_CUESHEET:
  59.         case FLAC_METADATA_TYPE_PICTURE:
  60.         case FLAC_METADATA_TYPE_VORBIS_COMMENT:
  61.             buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE);
  62.             if (!buffer) {
  63.                 return AVERROR(ENOMEM);
  64.             }
  65.             if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
  66.                 RETURN_ERROR(AVERROR(EIO));
  67.             }
  68.             break;
  69.         /* skip metadata block for unsupported types */
  70.         default:
  71.             ret = avio_skip(s->pb, metadata_size);
  72.             if (ret < 0)
  73.                 return ret;
  74.         }
  75.  
  76.         if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
  77.             FLACStreaminfo si;
  78.             /* STREAMINFO can only occur once */
  79.             if (found_streaminfo) {
  80.                 RETURN_ERROR(AVERROR_INVALIDDATA);
  81.             }
  82.             if (metadata_size != FLAC_STREAMINFO_SIZE) {
  83.                 RETURN_ERROR(AVERROR_INVALIDDATA);
  84.             }
  85.             found_streaminfo = 1;
  86.             st->codec->extradata      = buffer;
  87.             st->codec->extradata_size = metadata_size;
  88.             buffer = NULL;
  89.  
  90.             /* get codec params from STREAMINFO header */
  91.             avpriv_flac_parse_streaminfo(st->codec, &si, st->codec->extradata);
  92.  
  93.             /* set time base and duration */
  94.             if (si.samplerate > 0) {
  95.                 avpriv_set_pts_info(st, 64, 1, si.samplerate);
  96.                 if (si.samples > 0)
  97.                     st->duration = si.samples;
  98.             }
  99.         } else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) {
  100.             uint8_t isrc[13];
  101.             uint64_t start;
  102.             const uint8_t *offset;
  103.             int i, chapters, track, ti;
  104.             if (metadata_size < 431)
  105.                 RETURN_ERROR(AVERROR_INVALIDDATA);
  106.             offset = buffer + 395;
  107.             chapters = bytestream_get_byte(&offset) - 1;
  108.             if (chapters <= 0)
  109.                 RETURN_ERROR(AVERROR_INVALIDDATA);
  110.             for (i = 0; i < chapters; i++) {
  111.                 if (offset + 36 - buffer > metadata_size)
  112.                     RETURN_ERROR(AVERROR_INVALIDDATA);
  113.                 start = bytestream_get_be64(&offset);
  114.                 track = bytestream_get_byte(&offset);
  115.                 bytestream_get_buffer(&offset, isrc, 12);
  116.                 isrc[12] = 0;
  117.                 offset += 14;
  118.                 ti = bytestream_get_byte(&offset);
  119.                 if (ti <= 0) RETURN_ERROR(AVERROR_INVALIDDATA);
  120.                 offset += ti * 12;
  121.                 avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
  122.             }
  123.             av_freep(&buffer);
  124.         } else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) {
  125.             ret = ff_flac_parse_picture(s, buffer, metadata_size);
  126.             av_freep(&buffer);
  127.             if (ret < 0) {
  128.                 av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n");
  129.                 return ret;
  130.             }
  131.         } else {
  132.             /* STREAMINFO must be the first block */
  133.             if (!found_streaminfo) {
  134.                 RETURN_ERROR(AVERROR_INVALIDDATA);
  135.             }
  136.             /* process supported blocks other than STREAMINFO */
  137.             if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
  138.                 if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size)) {
  139.                     av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
  140.                 }
  141.             }
  142.             av_freep(&buffer);
  143.         }
  144.     }
  145.  
  146.     return 0;
  147.  
  148. fail:
  149.     av_free(buffer);
  150.     return ret;
  151. }
  152.  
  153. static int flac_probe(AVProbeData *p)
  154. {
  155.     if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4))
  156.         return 0;
  157.     return AVPROBE_SCORE_EXTENSION;
  158. }
  159.  
  160. AVInputFormat ff_flac_demuxer = {
  161.     .name           = "flac",
  162.     .long_name      = NULL_IF_CONFIG_SMALL("raw FLAC"),
  163.     .read_probe     = flac_probe,
  164.     .read_header    = flac_read_header,
  165.     .read_packet    = ff_raw_read_partial_packet,
  166.     .flags          = AVFMT_GENERIC_INDEX,
  167.     .extensions     = "flac",
  168.     .raw_codec_id   = AV_CODEC_ID_FLAC,
  169. };
  170.