mirror of https://git.ffmpeg.org/ffmpeg.git
348 lines
12 KiB
C
348 lines
12 KiB
C
/*
|
|
* 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 "libavutil/channel_layout.h"
|
|
#include "libavcodec/flac.h"
|
|
#include "avformat.h"
|
|
#include "demux.h"
|
|
#include "flac_picture.h"
|
|
#include "internal.h"
|
|
#include "rawdec.h"
|
|
#include "oggdec.h"
|
|
#include "replaygain.h"
|
|
|
|
#define SEEKPOINT_SIZE 18
|
|
|
|
typedef struct FLACDecContext {
|
|
FFRawDemuxerContext rawctx;
|
|
int found_seektable;
|
|
} FLACDecContext;
|
|
|
|
static void reset_index_position(int64_t metadata_head_size, AVStream *st)
|
|
{
|
|
FFStream *const sti = ffstream(st);
|
|
/* the real seek index offset should be the size of metadata blocks with the offset in the frame blocks */
|
|
for (int i = 0; i < sti->nb_index_entries; i++)
|
|
sti->index_entries[i].pos += metadata_head_size;
|
|
}
|
|
|
|
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;
|
|
FLACDecContext *flac = s->priv_data;
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_FLAC;
|
|
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
|
|
/* 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 (!avio_feof(s->pb) && !metadata_last) {
|
|
if (avio_read(s->pb, header, 4) != 4)
|
|
return AVERROR(AVERROR_INVALIDDATA);
|
|
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_PICTURE:
|
|
case FLAC_METADATA_TYPE_VORBIS_COMMENT:
|
|
case FLAC_METADATA_TYPE_SEEKTABLE:
|
|
buffer = av_mallocz(metadata_size + AV_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!buffer) {
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
|
|
RETURN_ERROR(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) {
|
|
uint32_t samplerate;
|
|
uint64_t samples;
|
|
|
|
/* STREAMINFO can only occur once */
|
|
if (found_streaminfo) {
|
|
RETURN_ERROR(AVERROR_INVALIDDATA);
|
|
}
|
|
if (metadata_size != FLAC_STREAMINFO_SIZE) {
|
|
RETURN_ERROR(AVERROR_INVALIDDATA);
|
|
}
|
|
found_streaminfo = 1;
|
|
st->codecpar->extradata = buffer;
|
|
st->codecpar->extradata_size = metadata_size;
|
|
buffer = NULL;
|
|
|
|
/* get sample rate and sample count from STREAMINFO header;
|
|
* other parameters will be extracted by the parser */
|
|
samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
|
|
samples = (AV_RB64(st->codecpar->extradata + 13) >> 24) & ((1ULL << 36) - 1);
|
|
|
|
/* set time base and duration */
|
|
if (samplerate > 0) {
|
|
avpriv_set_pts_info(st, 64, 1, samplerate);
|
|
if (samples > 0)
|
|
st->duration = 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_ERROR(AVERROR_INVALIDDATA);
|
|
offset = buffer + 395;
|
|
chapters = bytestream_get_byte(&offset) - 1;
|
|
if (chapters <= 0)
|
|
RETURN_ERROR(AVERROR_INVALIDDATA);
|
|
for (i = 0; i < chapters; i++) {
|
|
if (offset + 36 - buffer > metadata_size)
|
|
RETURN_ERROR(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_ERROR(AVERROR_INVALIDDATA);
|
|
offset += ti * 12;
|
|
avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
|
|
}
|
|
av_freep(&buffer);
|
|
} else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) {
|
|
ret = ff_flac_parse_picture(s, &buffer, metadata_size, 1);
|
|
av_freep(&buffer);
|
|
if (ret < 0) {
|
|
av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n");
|
|
return ret;
|
|
}
|
|
} else if (metadata_type == FLAC_METADATA_TYPE_SEEKTABLE) {
|
|
const uint8_t *seekpoint = buffer;
|
|
int i, seek_point_count = metadata_size/SEEKPOINT_SIZE;
|
|
flac->found_seektable = 1;
|
|
if ((s->flags&AVFMT_FLAG_FAST_SEEK)) {
|
|
for(i=0; i<seek_point_count; i++) {
|
|
int64_t timestamp = bytestream_get_be64(&seekpoint);
|
|
int64_t pos = bytestream_get_be64(&seekpoint);
|
|
/* skip number of samples */
|
|
bytestream_get_be16(&seekpoint);
|
|
av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
|
|
}
|
|
}
|
|
av_freep(&buffer);
|
|
}
|
|
else {
|
|
|
|
/* STREAMINFO must be the first block */
|
|
if (!found_streaminfo) {
|
|
RETURN_ERROR(AVERROR_INVALIDDATA);
|
|
}
|
|
/* process supported blocks other than STREAMINFO */
|
|
if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
|
|
AVDictionaryEntry *chmask;
|
|
|
|
ret = ff_vorbis_comment(s, &s->metadata, buffer, metadata_size, 1);
|
|
if (ret < 0) {
|
|
av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
|
|
} else if (ret > 0) {
|
|
s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
|
|
}
|
|
|
|
/* parse the channels mask if present */
|
|
chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
|
|
if (chmask) {
|
|
uint64_t mask = strtol(chmask->value, NULL, 0);
|
|
if (!mask || mask & ~0x3ffffULL) {
|
|
av_log(s, AV_LOG_WARNING,
|
|
"Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
|
|
} else {
|
|
av_channel_layout_from_mask(&st->codecpar->ch_layout, mask);
|
|
av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
|
|
}
|
|
}
|
|
}
|
|
av_freep(&buffer);
|
|
}
|
|
}
|
|
|
|
ret = ff_replaygain_export(st, s->metadata);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
reset_index_position(avio_tell(s->pb), st);
|
|
return 0;
|
|
|
|
fail:
|
|
av_free(buffer);
|
|
return ret;
|
|
}
|
|
|
|
static int raw_flac_probe(const AVProbeData *p)
|
|
{
|
|
if ((p->buf[2] & 0xF0) == 0) // blocksize code invalid
|
|
return 0;
|
|
if ((p->buf[2] & 0x0F) == 0x0F) // sample rate code invalid
|
|
return 0;
|
|
if ((p->buf[3] & 0xF0) >= FLAC_MAX_CHANNELS + FLAC_CHMODE_MID_SIDE << 4)
|
|
// channel mode invalid
|
|
return 0;
|
|
if ((p->buf[3] & 0x06) == 0x06) // bits per sample code invalid
|
|
return 0;
|
|
if ((p->buf[3] & 0x01) == 0x01) // reserved bit set
|
|
return 0;
|
|
return AVPROBE_SCORE_EXTENSION / 4 + 1;
|
|
}
|
|
|
|
static int flac_probe(const AVProbeData *p)
|
|
{
|
|
if ((AV_RB16(p->buf) & 0xFFFE) == 0xFFF8)
|
|
return raw_flac_probe(p);
|
|
|
|
/* file header + metadata header + checked bytes of streaminfo */
|
|
if (p->buf_size >= 4 + 4 + 13) {
|
|
int type = p->buf[4] & 0x7f;
|
|
int size = AV_RB24(p->buf + 5);
|
|
int min_block_size = AV_RB16(p->buf + 8);
|
|
int max_block_size = AV_RB16(p->buf + 10);
|
|
int sample_rate = AV_RB24(p->buf + 18) >> 4;
|
|
|
|
if (memcmp(p->buf, "fLaC", 4))
|
|
return 0;
|
|
if (type == FLAC_METADATA_TYPE_STREAMINFO &&
|
|
size == FLAC_STREAMINFO_SIZE &&
|
|
min_block_size >= 16 &&
|
|
max_block_size >= min_block_size &&
|
|
sample_rate && sample_rate <= 655350)
|
|
return AVPROBE_SCORE_MAX;
|
|
return AVPROBE_SCORE_EXTENSION;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_index,
|
|
int64_t *ppos, int64_t pos_limit)
|
|
{
|
|
FFFormatContext *const si = ffformatcontext(s);
|
|
AVPacket *const pkt = si->parse_pkt;
|
|
AVStream *st = s->streams[stream_index];
|
|
AVCodecParserContext *parser;
|
|
int ret;
|
|
int64_t pts = AV_NOPTS_VALUE;
|
|
|
|
if (avio_seek(s->pb, *ppos, SEEK_SET) < 0)
|
|
return AV_NOPTS_VALUE;
|
|
|
|
parser = av_parser_init(st->codecpar->codec_id);
|
|
if (!parser){
|
|
return AV_NOPTS_VALUE;
|
|
}
|
|
parser->flags |= PARSER_FLAG_USE_CODEC_TS;
|
|
|
|
for (;;){
|
|
uint8_t *data;
|
|
int size;
|
|
|
|
ret = ff_raw_read_partial_packet(s, pkt);
|
|
if (ret < 0){
|
|
if (ret == AVERROR(EAGAIN))
|
|
continue;
|
|
else {
|
|
av_packet_unref(pkt);
|
|
av_assert1(!pkt->size);
|
|
}
|
|
}
|
|
av_parser_parse2(parser, ffstream(st)->avctx,
|
|
&data, &size, pkt->data, pkt->size,
|
|
pkt->pts, pkt->dts, *ppos);
|
|
|
|
av_packet_unref(pkt);
|
|
if (size) {
|
|
if (parser->pts != AV_NOPTS_VALUE){
|
|
// seeking may not have started from beginning of a frame
|
|
// calculate frame start position from next frame backwards
|
|
*ppos = parser->next_frame_offset - size;
|
|
pts = parser->pts;
|
|
break;
|
|
}
|
|
} else if (ret < 0)
|
|
break;
|
|
}
|
|
av_parser_close(parser);
|
|
return pts;
|
|
}
|
|
|
|
static int flac_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) {
|
|
AVStream *const st = s->streams[0];
|
|
FFStream *const sti = ffstream(st);
|
|
int index;
|
|
int64_t pos;
|
|
AVIndexEntry e;
|
|
FLACDecContext *flac = s->priv_data;
|
|
|
|
if (!flac->found_seektable || !(s->flags&AVFMT_FLAG_FAST_SEEK)) {
|
|
return -1;
|
|
}
|
|
|
|
index = av_index_search_timestamp(st, timestamp, flags);
|
|
if (index < 0 || index >= sti->nb_index_entries)
|
|
return -1;
|
|
|
|
e = sti->index_entries[index];
|
|
pos = avio_seek(s->pb, e.pos, SEEK_SET);
|
|
if (pos >= 0) {
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
const 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,
|
|
.read_seek = flac_seek,
|
|
.read_timestamp = flac_read_timestamp,
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
.extensions = "flac",
|
|
.raw_codec_id = AV_CODEC_ID_FLAC,
|
|
.priv_data_size = sizeof(FLACDecContext),
|
|
.priv_class = &ff_raw_demuxer_class,
|
|
};
|