7784f47762
The only parameters needed by the demuxers are the sample rate and sample count, which can be trivially extracted manually, without resorting to an avpriv function.
195 lines
7.1 KiB
C
195 lines
7.1 KiB
C
/*
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* Raw FLAC demuxer
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavcodec/flac.h"
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#include "avformat.h"
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#include "flac_picture.h"
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#include "internal.h"
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#include "rawdec.h"
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#include "oggdec.h"
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#include "vorbiscomment.h"
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#include "replaygain.h"
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static int flac_read_header(AVFormatContext *s)
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{
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int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
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uint8_t header[4];
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uint8_t *buffer=NULL;
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = AV_CODEC_ID_FLAC;
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st->need_parsing = AVSTREAM_PARSE_FULL;
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/* the parameters will be extracted from the compressed bitstream */
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/* if fLaC marker is not found, assume there is no header */
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if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) {
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avio_seek(s->pb, -4, SEEK_CUR);
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return 0;
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}
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/* process metadata blocks */
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while (!s->pb->eof_reached && !metadata_last) {
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avio_read(s->pb, header, 4);
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flac_parse_block_header(header, &metadata_last, &metadata_type,
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&metadata_size);
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switch (metadata_type) {
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/* allocate and read metadata block for supported types */
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case FLAC_METADATA_TYPE_STREAMINFO:
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case FLAC_METADATA_TYPE_CUESHEET:
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case FLAC_METADATA_TYPE_PICTURE:
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case FLAC_METADATA_TYPE_VORBIS_COMMENT:
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buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!buffer) {
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return AVERROR(ENOMEM);
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}
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if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
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av_freep(&buffer);
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return AVERROR(EIO);
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}
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break;
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/* skip metadata block for unsupported types */
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default:
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ret = avio_skip(s->pb, metadata_size);
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if (ret < 0)
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return ret;
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}
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if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
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uint32_t samplerate;
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uint64_t samples;
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/* STREAMINFO can only occur once */
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if (found_streaminfo) {
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av_freep(&buffer);
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return AVERROR_INVALIDDATA;
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}
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if (metadata_size != FLAC_STREAMINFO_SIZE) {
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av_freep(&buffer);
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return AVERROR_INVALIDDATA;
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}
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found_streaminfo = 1;
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st->codec->extradata = buffer;
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st->codec->extradata_size = metadata_size;
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buffer = NULL;
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/* get sample rate and sample count from STREAMINFO header;
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* other parameters will be extracted by the parser */
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samplerate = AV_RB24(st->codec->extradata + 10) >> 4;
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samples = (AV_RB64(st->codec->extradata + 13) >> 24) & ((1ULL << 36) - 1);
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/* set time base and duration */
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if (samplerate > 0) {
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avpriv_set_pts_info(st, 64, 1, samplerate);
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if (samples > 0)
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st->duration = samples;
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}
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} else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) {
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uint8_t isrc[13];
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uint64_t start;
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const uint8_t *offset;
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int i, chapters, track, ti;
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if (metadata_size < 431)
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return AVERROR_INVALIDDATA;
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offset = buffer + 395;
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chapters = bytestream_get_byte(&offset) - 1;
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if (chapters <= 0)
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return AVERROR_INVALIDDATA;
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for (i = 0; i < chapters; i++) {
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if (offset + 36 - buffer > metadata_size)
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return AVERROR_INVALIDDATA;
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start = bytestream_get_be64(&offset);
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track = bytestream_get_byte(&offset);
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bytestream_get_buffer(&offset, isrc, 12);
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isrc[12] = 0;
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offset += 14;
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ti = bytestream_get_byte(&offset);
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if (ti <= 0) return AVERROR_INVALIDDATA;
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offset += ti * 12;
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avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
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}
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} else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) {
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ret = ff_flac_parse_picture(s, buffer, metadata_size);
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av_freep(&buffer);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n");
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return ret;
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}
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} else {
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/* STREAMINFO must be the first block */
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if (!found_streaminfo) {
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av_freep(&buffer);
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return AVERROR_INVALIDDATA;
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}
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/* process supported blocks other than STREAMINFO */
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if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
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AVDictionaryEntry *chmask;
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ret = ff_vorbis_comment(s, &s->metadata, buffer, metadata_size, 1);
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if (ret < 0) {
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av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
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} else if (ret > 0) {
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s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
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}
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/* parse the channels mask if present */
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chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
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if (chmask) {
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uint64_t mask = strtol(chmask->value, NULL, 0);
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if (!mask || mask & ~0x3ffffULL) {
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av_log(s, AV_LOG_WARNING,
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"Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
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} else {
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st->codec->channel_layout = mask;
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av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
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}
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}
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}
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av_freep(&buffer);
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}
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}
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ret = ff_replaygain_export(st, s->metadata);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int flac_probe(AVProbeData *p)
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{
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if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4))
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return 0;
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return AVPROBE_SCORE_EXTENSION;
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}
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AVInputFormat ff_flac_demuxer = {
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.name = "flac",
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.long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
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.read_probe = flac_probe,
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.read_header = flac_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.flags = AVFMT_GENERIC_INDEX,
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.extensions = "flac",
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.raw_codec_id = AV_CODEC_ID_FLAC,
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};
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