| /* |
| * Raw FLAC demuxer |
| * Copyright (c) 2001 Fabrice Bellard |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavcodec/flac.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "rawdec.h" |
| #include "oggdec.h" |
| #include "vorbiscomment.h" |
| #include "libavcodec/bytestream.h" |
| |
| static int flac_read_header(AVFormatContext *s) |
| { |
| int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0; |
| uint8_t header[4]; |
| uint8_t *buffer=NULL; |
| AVStream *st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->codec_id = CODEC_ID_FLAC; |
| st->need_parsing = AVSTREAM_PARSE_FULL; |
| /* the parameters will be extracted from the compressed bitstream */ |
| |
| /* if fLaC marker is not found, assume there is no header */ |
| if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) { |
| avio_seek(s->pb, -4, SEEK_CUR); |
| return 0; |
| } |
| |
| /* process metadata blocks */ |
| while (!url_feof(s->pb) && !metadata_last) { |
| avio_read(s->pb, header, 4); |
| avpriv_flac_parse_block_header(header, &metadata_last, &metadata_type, |
| &metadata_size); |
| switch (metadata_type) { |
| /* allocate and read metadata block for supported types */ |
| case FLAC_METADATA_TYPE_STREAMINFO: |
| case FLAC_METADATA_TYPE_CUESHEET: |
| case FLAC_METADATA_TYPE_VORBIS_COMMENT: |
| buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE); |
| if (!buffer) { |
| return AVERROR(ENOMEM); |
| } |
| if (avio_read(s->pb, buffer, metadata_size) != metadata_size) { |
| av_freep(&buffer); |
| return AVERROR(EIO); |
| } |
| break; |
| /* skip metadata block for unsupported types */ |
| default: |
| ret = avio_skip(s->pb, metadata_size); |
| if (ret < 0) |
| return ret; |
| } |
| |
| if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) { |
| FLACStreaminfo si; |
| /* STREAMINFO can only occur once */ |
| if (found_streaminfo) { |
| av_freep(&buffer); |
| return AVERROR_INVALIDDATA; |
| } |
| if (metadata_size != FLAC_STREAMINFO_SIZE) { |
| av_freep(&buffer); |
| return AVERROR_INVALIDDATA; |
| } |
| found_streaminfo = 1; |
| st->codec->extradata = buffer; |
| st->codec->extradata_size = metadata_size; |
| buffer = NULL; |
| |
| /* get codec params from STREAMINFO header */ |
| avpriv_flac_parse_streaminfo(st->codec, &si, st->codec->extradata); |
| |
| /* set time base and duration */ |
| if (si.samplerate > 0) { |
| avpriv_set_pts_info(st, 64, 1, si.samplerate); |
| if (si.samples > 0) |
| st->duration = si.samples; |
| } |
| } else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) { |
| uint8_t isrc[13]; |
| uint64_t start; |
| const uint8_t *offset; |
| int i, chapters, track, ti; |
| if (metadata_size < 431) |
| return AVERROR_INVALIDDATA; |
| offset = buffer + 395; |
| chapters = bytestream_get_byte(&offset) - 1; |
| if (chapters <= 0) |
| return AVERROR_INVALIDDATA; |
| for (i = 0; i < chapters; i++) { |
| if (offset + 36 - buffer > metadata_size) |
| return AVERROR_INVALIDDATA; |
| start = bytestream_get_be64(&offset); |
| track = bytestream_get_byte(&offset); |
| bytestream_get_buffer(&offset, isrc, 12); |
| isrc[12] = 0; |
| offset += 14; |
| ti = bytestream_get_byte(&offset); |
| if (ti <= 0) return AVERROR_INVALIDDATA; |
| offset += ti * 12; |
| avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc); |
| } |
| } else { |
| /* STREAMINFO must be the first block */ |
| if (!found_streaminfo) { |
| av_freep(&buffer); |
| return AVERROR_INVALIDDATA; |
| } |
| /* process supported blocks other than STREAMINFO */ |
| if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) { |
| if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size)) { |
| av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n"); |
| } |
| } |
| av_freep(&buffer); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int flac_probe(AVProbeData *p) |
| { |
| uint8_t *bufptr = p->buf; |
| uint8_t *end = p->buf + p->buf_size; |
| |
| if(bufptr > end-4 || memcmp(bufptr, "fLaC", 4)) return 0; |
| else return AVPROBE_SCORE_MAX/2; |
| } |
| |
| AVInputFormat ff_flac_demuxer = { |
| .name = "flac", |
| .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"), |
| .read_probe = flac_probe, |
| .read_header = flac_read_header, |
| .read_packet = ff_raw_read_partial_packet, |
| .flags = AVFMT_GENERIC_INDEX, |
| .extensions = "flac", |
| .raw_codec_id = CODEC_ID_FLAC, |
| }; |