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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Raw FLAC demuxer |
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| 3 | * Copyright (c) 2001 Fabrice Bellard |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavcodec/flac.h" |
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| 23 | #include "avformat.h" |
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| 24 | #include "flac_picture.h" |
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| 25 | #include "internal.h" |
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| 26 | #include "rawdec.h" |
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| 27 | #include "oggdec.h" |
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| 28 | #include "vorbiscomment.h" |
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| 29 | #include "libavcodec/bytestream.h" |
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| 30 | |||
| 31 | static int flac_read_header(AVFormatContext *s) |
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| 32 | { |
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| 33 | int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0; |
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| 34 | uint8_t header[4]; |
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| 35 | uint8_t *buffer=NULL; |
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| 36 | AVStream *st = avformat_new_stream(s, NULL); |
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| 37 | if (!st) |
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| 38 | return AVERROR(ENOMEM); |
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| 39 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 40 | st->codec->codec_id = AV_CODEC_ID_FLAC; |
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| 41 | st->need_parsing = AVSTREAM_PARSE_FULL_RAW; |
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| 42 | /* the parameters will be extracted from the compressed bitstream */ |
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| 43 | |||
| 44 | /* if fLaC marker is not found, assume there is no header */ |
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| 45 | if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) { |
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| 46 | avio_seek(s->pb, -4, SEEK_CUR); |
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| 47 | return 0; |
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| 48 | } |
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| 49 | |||
| 50 | /* process metadata blocks */ |
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| 51 | while (!url_feof(s->pb) && !metadata_last) { |
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| 52 | avio_read(s->pb, header, 4); |
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| 53 | avpriv_flac_parse_block_header(header, &metadata_last, &metadata_type, |
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| 54 | &metadata_size); |
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| 55 | switch (metadata_type) { |
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| 56 | /* allocate and read metadata block for supported types */ |
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| 57 | case FLAC_METADATA_TYPE_STREAMINFO: |
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| 58 | case FLAC_METADATA_TYPE_CUESHEET: |
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| 59 | case FLAC_METADATA_TYPE_PICTURE: |
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| 60 | case FLAC_METADATA_TYPE_VORBIS_COMMENT: |
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| 61 | buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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| 62 | if (!buffer) { |
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| 63 | return AVERROR(ENOMEM); |
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| 64 | } |
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| 65 | if (avio_read(s->pb, buffer, metadata_size) != metadata_size) { |
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| 66 | RETURN_ERROR(AVERROR(EIO)); |
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| 67 | } |
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| 68 | break; |
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| 69 | /* skip metadata block for unsupported types */ |
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| 70 | default: |
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| 71 | ret = avio_skip(s->pb, metadata_size); |
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| 72 | if (ret < 0) |
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| 73 | return ret; |
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| 74 | } |
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| 75 | |||
| 76 | if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) { |
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| 77 | FLACStreaminfo si; |
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| 78 | /* STREAMINFO can only occur once */ |
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| 79 | if (found_streaminfo) { |
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| 80 | RETURN_ERROR(AVERROR_INVALIDDATA); |
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| 81 | } |
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| 82 | if (metadata_size != FLAC_STREAMINFO_SIZE) { |
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| 83 | RETURN_ERROR(AVERROR_INVALIDDATA); |
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| 84 | } |
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| 85 | found_streaminfo = 1; |
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| 86 | st->codec->extradata = buffer; |
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| 87 | st->codec->extradata_size = metadata_size; |
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| 88 | buffer = NULL; |
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| 89 | |||
| 90 | /* get codec params from STREAMINFO header */ |
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| 91 | avpriv_flac_parse_streaminfo(st->codec, &si, st->codec->extradata); |
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| 92 | |||
| 93 | /* set time base and duration */ |
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| 94 | if (si.samplerate > 0) { |
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| 95 | avpriv_set_pts_info(st, 64, 1, si.samplerate); |
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| 96 | if (si.samples > 0) |
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| 97 | st->duration = si.samples; |
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| 98 | } |
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| 99 | } else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) { |
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| 100 | uint8_t isrc[13]; |
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| 101 | uint64_t start; |
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| 102 | const uint8_t *offset; |
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| 103 | int i, chapters, track, ti; |
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| 104 | if (metadata_size < 431) |
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| 105 | RETURN_ERROR(AVERROR_INVALIDDATA); |
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| 106 | offset = buffer + 395; |
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| 107 | chapters = bytestream_get_byte(&offset) - 1; |
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| 108 | if (chapters <= 0) |
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| 109 | RETURN_ERROR(AVERROR_INVALIDDATA); |
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| 110 | for (i = 0; i < chapters; i++) { |
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| 111 | if (offset + 36 - buffer > metadata_size) |
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| 112 | RETURN_ERROR(AVERROR_INVALIDDATA); |
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| 113 | start = bytestream_get_be64(&offset); |
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| 114 | track = bytestream_get_byte(&offset); |
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| 115 | bytestream_get_buffer(&offset, isrc, 12); |
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| 116 | isrc[12] = 0; |
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| 117 | offset += 14; |
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| 118 | ti = bytestream_get_byte(&offset); |
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| 119 | if (ti <= 0) RETURN_ERROR(AVERROR_INVALIDDATA); |
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| 120 | offset += ti * 12; |
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| 121 | avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc); |
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| 122 | } |
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| 123 | av_freep(&buffer); |
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| 124 | } else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) { |
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| 125 | ret = ff_flac_parse_picture(s, buffer, metadata_size); |
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| 126 | av_freep(&buffer); |
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| 127 | if (ret < 0) { |
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| 128 | av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n"); |
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| 129 | return ret; |
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| 130 | } |
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| 131 | } else { |
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| 132 | /* STREAMINFO must be the first block */ |
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| 133 | if (!found_streaminfo) { |
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| 134 | RETURN_ERROR(AVERROR_INVALIDDATA); |
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| 135 | } |
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| 136 | /* process supported blocks other than STREAMINFO */ |
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| 137 | if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) { |
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| 138 | if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size)) { |
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| 139 | av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n"); |
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| 140 | } |
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| 141 | } |
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| 142 | av_freep(&buffer); |
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| 143 | } |
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| 144 | } |
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| 145 | |||
| 146 | return 0; |
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| 147 | |||
| 148 | fail: |
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| 149 | av_free(buffer); |
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| 150 | return ret; |
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| 151 | } |
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| 152 | |||
| 153 | static int flac_probe(AVProbeData *p) |
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| 154 | { |
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| 155 | if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4)) |
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| 156 | return 0; |
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| 157 | return AVPROBE_SCORE_EXTENSION; |
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| 158 | } |
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| 159 | |||
| 160 | AVInputFormat ff_flac_demuxer = { |
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| 161 | .name = "flac", |
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| 162 | .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"), |
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| 163 | .read_probe = flac_probe, |
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| 164 | .read_header = flac_read_header, |
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| 165 | .read_packet = ff_raw_read_partial_packet, |
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| 166 | .flags = AVFMT_GENERIC_INDEX, |
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| 167 | .extensions = "flac", |
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| 168 | .raw_codec_id = AV_CODEC_ID_FLAC, |
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| 169 | }; |