mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
227 lines
6.3 KiB
227 lines
6.3 KiB
/* |
|
* WavPack demuxer |
|
* Copyright (c) 2006 Konstantin Shishkov. |
|
* |
|
* 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/intreadwrite.h" |
|
#include "avformat.h" |
|
|
|
// specs say that maximum block size is 1Mb |
|
#define WV_BLOCK_LIMIT 1047576 |
|
|
|
#define WV_EXTRA_SIZE 12 |
|
|
|
enum WV_FLAGS{ |
|
WV_MONO = 0x0004, |
|
WV_HYBRID = 0x0008, |
|
WV_JOINT = 0x0010, |
|
WV_CROSSD = 0x0020, |
|
WV_HSHAPE = 0x0040, |
|
WV_FLOAT = 0x0080, |
|
WV_INT32 = 0x0100, |
|
WV_HBR = 0x0200, |
|
WV_HBAL = 0x0400, |
|
WV_MCINIT = 0x0800, |
|
WV_MCEND = 0x1000, |
|
}; |
|
|
|
static const int wv_rates[16] = { |
|
6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000, |
|
32000, 44100, 48000, 64000, 88200, 96000, 192000, -1 |
|
}; |
|
|
|
typedef struct{ |
|
uint32_t blksize, flags; |
|
int rate, chan, bpp; |
|
uint32_t samples, soff; |
|
int block_parsed; |
|
uint8_t extra[WV_EXTRA_SIZE]; |
|
int64_t pos; |
|
}WVContext; |
|
|
|
static int wv_probe(AVProbeData *p) |
|
{ |
|
/* check file header */ |
|
if (p->buf_size <= 32) |
|
return 0; |
|
if (p->buf[0] == 'w' && p->buf[1] == 'v' && |
|
p->buf[2] == 'p' && p->buf[3] == 'k') |
|
return AVPROBE_SCORE_MAX; |
|
else |
|
return 0; |
|
} |
|
|
|
static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb) |
|
{ |
|
WVContext *wc = ctx->priv_data; |
|
uint32_t tag, ver; |
|
int size; |
|
int rate, bpp, chan; |
|
|
|
wc->pos = url_ftell(pb); |
|
tag = get_le32(pb); |
|
if (tag != MKTAG('w', 'v', 'p', 'k')) |
|
return -1; |
|
size = get_le32(pb); |
|
if(size < 24 || size > WV_BLOCK_LIMIT){ |
|
av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size); |
|
return -1; |
|
} |
|
wc->blksize = size; |
|
ver = get_le16(pb); |
|
if(ver < 0x402 || ver > 0x410){ |
|
av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver); |
|
return -1; |
|
} |
|
get_byte(pb); // track no |
|
get_byte(pb); // track sub index |
|
wc->samples = get_le32(pb); // total samples in file |
|
wc->soff = get_le32(pb); // offset in samples of current block |
|
get_buffer(pb, wc->extra, WV_EXTRA_SIZE); |
|
wc->flags = AV_RL32(wc->extra + 4); |
|
//parse flags |
|
if(wc->flags & WV_FLOAT){ |
|
av_log(ctx, AV_LOG_ERROR, "Floating point data is not supported\n"); |
|
return -1; |
|
} |
|
|
|
bpp = ((wc->flags & 3) + 1) << 3; |
|
chan = 1 + !(wc->flags & WV_MONO); |
|
rate = wv_rates[(wc->flags >> 23) & 0xF]; |
|
if(rate == -1){ |
|
av_log(ctx, AV_LOG_ERROR, "Unknown sampling rate\n"); |
|
return -1; |
|
} |
|
if(!wc->bpp) wc->bpp = bpp; |
|
if(!wc->chan) wc->chan = chan; |
|
if(!wc->rate) wc->rate = rate; |
|
|
|
if(wc->flags && bpp != wc->bpp){ |
|
av_log(ctx, AV_LOG_ERROR, "Bits per sample differ, this block: %i, header block: %i\n", bpp, wc->bpp); |
|
return -1; |
|
} |
|
if(wc->flags && chan != wc->chan){ |
|
av_log(ctx, AV_LOG_ERROR, "Channels differ, this block: %i, header block: %i\n", chan, wc->chan); |
|
return -1; |
|
} |
|
if(wc->flags && rate != wc->rate){ |
|
av_log(ctx, AV_LOG_ERROR, "Sampling rate differ, this block: %i, header block: %i\n", rate, wc->rate); |
|
return -1; |
|
} |
|
wc->blksize = size - 24; |
|
return 0; |
|
} |
|
|
|
static int wv_read_header(AVFormatContext *s, |
|
AVFormatParameters *ap) |
|
{ |
|
ByteIOContext *pb = s->pb; |
|
WVContext *wc = s->priv_data; |
|
AVStream *st; |
|
|
|
if(wv_read_block_header(s, pb) < 0) |
|
return -1; |
|
|
|
wc->block_parsed = 0; |
|
/* now we are ready: build format streams */ |
|
st = av_new_stream(s, 0); |
|
if (!st) |
|
return -1; |
|
st->codec->codec_type = CODEC_TYPE_AUDIO; |
|
st->codec->codec_id = CODEC_ID_WAVPACK; |
|
st->codec->channels = wc->chan; |
|
st->codec->sample_rate = wc->rate; |
|
st->codec->bits_per_coded_sample = wc->bpp; |
|
av_set_pts_info(st, 64, 1, wc->rate); |
|
s->start_time = 0; |
|
s->duration = (int64_t)wc->samples * AV_TIME_BASE / st->codec->sample_rate; |
|
return 0; |
|
} |
|
|
|
static int wv_read_packet(AVFormatContext *s, |
|
AVPacket *pkt) |
|
{ |
|
WVContext *wc = s->priv_data; |
|
int ret; |
|
|
|
if (url_feof(s->pb)) |
|
return AVERROR(EIO); |
|
if(wc->block_parsed){ |
|
if(wv_read_block_header(s, s->pb) < 0) |
|
return -1; |
|
} |
|
|
|
if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE) < 0) |
|
return AVERROR(ENOMEM); |
|
memcpy(pkt->data, wc->extra, WV_EXTRA_SIZE); |
|
ret = get_buffer(s->pb, pkt->data + WV_EXTRA_SIZE, wc->blksize); |
|
if(ret != wc->blksize){ |
|
av_free_packet(pkt); |
|
return AVERROR(EIO); |
|
} |
|
pkt->stream_index = 0; |
|
wc->block_parsed = 1; |
|
pkt->size = ret + WV_EXTRA_SIZE; |
|
pkt->pts = wc->soff; |
|
av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME); |
|
return 0; |
|
} |
|
|
|
static int wv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
|
{ |
|
AVStream *st = s->streams[stream_index]; |
|
WVContext *wc = s->priv_data; |
|
AVPacket pkt1, *pkt = &pkt1; |
|
int ret; |
|
int index = av_index_search_timestamp(st, timestamp, flags); |
|
int64_t pos, pts; |
|
|
|
/* if found, seek there */ |
|
if (index >= 0){ |
|
wc->block_parsed = 1; |
|
url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET); |
|
return 0; |
|
} |
|
/* if timestamp is out of bounds, return error */ |
|
if(timestamp < 0 || timestamp >= s->duration) |
|
return -1; |
|
|
|
pos = url_ftell(s->pb); |
|
do{ |
|
ret = av_read_frame(s, pkt); |
|
if (ret < 0){ |
|
url_fseek(s->pb, pos, SEEK_SET); |
|
return -1; |
|
} |
|
pts = pkt->pts; |
|
av_free_packet(pkt); |
|
}while(pts < timestamp); |
|
return 0; |
|
} |
|
|
|
AVInputFormat wv_demuxer = { |
|
"wv", |
|
NULL_IF_CONFIG_SMALL("WavPack"), |
|
sizeof(WVContext), |
|
wv_probe, |
|
wv_read_header, |
|
wv_read_packet, |
|
NULL, |
|
wv_read_seek, |
|
};
|
|
|