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ffmpeg/libavformat/wv.c

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/*
* WavPack demuxer
* Copyright (c) 2006,2011 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/audioconvert.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "apetag.h"
#include "id3v1.h"
// specs say that maximum block size is 1Mb
#define WV_BLOCK_LIMIT 1047576
#define WV_EXTRA_SIZE 12
#define WV_START_BLOCK 0x0800
#define WV_END_BLOCK 0x1000
#define WV_SINGLE_BLOCK (WV_START_BLOCK | WV_END_BLOCK)
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 chmask;
uint32_t samples, soff;
int multichannel;
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, AVIOContext *pb, int append)
{
WVContext *wc = ctx->priv_data;
uint32_t tag, ver;
int size;
int rate, bpp, chan;
uint32_t chmask;
wc->pos = avio_tell(pb);
if(!append){
tag = avio_rl32(pb);
if (tag != MKTAG('w', 'v', 'p', 'k'))
return -1;
size = avio_rl32(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 = avio_rl16(pb);
if(ver < 0x402 || ver > 0x410){
av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
return -1;
}
avio_r8(pb); // track no
avio_r8(pb); // track sub index
wc->samples = avio_rl32(pb); // total samples in file
wc->soff = avio_rl32(pb); // offset in samples of current block
avio_read(pb, wc->extra, WV_EXTRA_SIZE);
}else{
size = wc->blksize;
}
wc->flags = AV_RL32(wc->extra + 4);
// blocks with zero samples don't contain actual audio information and should be ignored
if (!AV_RN32(wc->extra))
return 0;
//parse flags
bpp = ((wc->flags & 3) + 1) << 3;
chan = 1 + !(wc->flags & WV_MONO);
chmask = wc->flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
rate = wv_rates[(wc->flags >> 23) & 0xF];
wc->multichannel = !!((wc->flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK);
if(wc->multichannel){
chan = wc->chan;
chmask = wc->chmask;
}
if((rate == -1 || !chan) && !wc->block_parsed){
int64_t block_end = avio_tell(pb) + wc->blksize - 24;
if(!pb->seekable){
av_log(ctx, AV_LOG_ERROR, "Cannot determine additional parameters\n");
return -1;
}
while(avio_tell(pb) < block_end){
int id, size;
id = avio_r8(pb);
size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
size <<= 1;
if(id&0x40)
size--;
switch(id&0x3F){
case 0xD:
if(size <= 1){
av_log(ctx, AV_LOG_ERROR, "Insufficient channel information\n");
return -1;
}
chan = avio_r8(pb);
switch(size - 2){
case 0:
chmask = avio_r8(pb);
break;
case 1:
chmask = avio_rl16(pb);
break;
case 2:
chmask = avio_rl24(pb);
break;
case 3:
chmask = avio_rl32(pb);
break;
case 5:
avio_skip(pb, 1);
chan |= (avio_r8(pb) & 0xF) << 8;
chmask = avio_rl24(pb);
break;
default:
av_log(ctx, AV_LOG_ERROR, "Invalid channel info size %d\n", size);
return -1;
}
break;
case 0x27:
rate = avio_rl24(pb);
break;
default:
avio_skip(pb, size);
}
if(id&0x40)
avio_skip(pb, 1);
}
if(rate == -1){
av_log(ctx, AV_LOG_ERROR, "Cannot determine custom sampling rate\n");
return -1;
}
avio_seek(pb, block_end - wc->blksize + 24, SEEK_SET);
}
if(!wc->bpp) wc->bpp = bpp;
if(!wc->chan) wc->chan = chan;
if(!wc->chmask) wc->chmask = chmask;
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 && !wc->multichannel && 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 != -1 && 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)
{
AVIOContext *pb = s->pb;
WVContext *wc = s->priv_data;
AVStream *st;
wc->block_parsed = 0;
for(;;){
if(wv_read_block_header(s, pb, 0) < 0)
return -1;
if(!AV_RN32(wc->extra))
avio_skip(pb, wc->blksize - 24);
else
break;
}
/* now we are ready: build format streams */
st = avformat_new_stream(s, NULL);
if (!st)
return -1;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_WAVPACK;
st->codec->channels = wc->chan;
st->codec->channel_layout = wc->chmask;
st->codec->sample_rate = wc->rate;
st->codec->bits_per_coded_sample = wc->bpp;
av_set_pts_info(st, 64, 1, wc->rate);
st->start_time = 0;
st->duration = wc->samples;
if(s->pb->seekable) {
int64_t cur = avio_tell(s->pb);
ff_ape_parse_tag(s);
if(!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
ff_id3v1_read(s);
avio_seek(s->pb, cur, SEEK_SET);
}
return 0;
}
static int wv_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
WVContext *wc = s->priv_data;
int ret;
int size, ver, off;
int64_t pos;
if (url_feof(s->pb))
return AVERROR(EIO);
if(wc->block_parsed){
if(wv_read_block_header(s, s->pb, 0) < 0)
return -1;
}
pos = wc->pos;
off = wc->multichannel ? 4 : 0;
if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE + off) < 0)
return AVERROR(ENOMEM);
if(wc->multichannel)
AV_WL32(pkt->data, wc->blksize + WV_EXTRA_SIZE + 12);
memcpy(pkt->data + off, wc->extra, WV_EXTRA_SIZE);
ret = avio_read(s->pb, pkt->data + WV_EXTRA_SIZE + off, wc->blksize);
if(ret != wc->blksize){
av_free_packet(pkt);
return AVERROR(EIO);
}
while(!(wc->flags & WV_END_BLOCK)){
if(avio_rl32(s->pb) != MKTAG('w', 'v', 'p', 'k')){
av_free_packet(pkt);
return -1;
}
if((ret = av_append_packet(s->pb, pkt, 4)) < 0){
av_free_packet(pkt);
return ret;
}
size = AV_RL32(pkt->data + pkt->size - 4);
if(size < 24 || size > WV_BLOCK_LIMIT){
av_free_packet(pkt);
av_log(s, AV_LOG_ERROR, "Incorrect block size %d\n", size);
return -1;
}
wc->blksize = size;
ver = avio_rl16(s->pb);
if(ver < 0x402 || ver > 0x410){
av_free_packet(pkt);
av_log(s, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
return -1;
}
avio_r8(s->pb); // track no
avio_r8(s->pb); // track sub index
wc->samples = avio_rl32(s->pb); // total samples in file
wc->soff = avio_rl32(s->pb); // offset in samples of current block
if((ret = av_append_packet(s->pb, pkt, WV_EXTRA_SIZE)) < 0){
av_free_packet(pkt);
return ret;
}
memcpy(wc->extra, pkt->data + pkt->size - WV_EXTRA_SIZE, WV_EXTRA_SIZE);
if(wv_read_block_header(s, s->pb, 1) < 0){
av_free_packet(pkt);
return -1;
}
ret = av_append_packet(s->pb, pkt, wc->blksize);
if(ret < 0){
av_free_packet(pkt);
return ret;
}
}
pkt->stream_index = 0;
wc->block_parsed = 1;
pkt->pts = wc->soff;
av_add_index_entry(s->streams[0], 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 &&
timestamp <= st->index_entries[st->nb_index_entries - 1].timestamp) {
wc->block_parsed = 1;
avio_seek(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 = avio_tell(s->pb);
do{
ret = av_read_frame(s, pkt);
if (ret < 0){
avio_seek(s->pb, pos, SEEK_SET);
return -1;
}
pts = pkt->pts;
av_free_packet(pkt);
}while(pts < timestamp);
return 0;
}
AVInputFormat ff_wv_demuxer = {
.name = "wv",
.long_name = NULL_IF_CONFIG_SMALL("WavPack"),
.priv_data_size = sizeof(WVContext),
.read_probe = wv_probe,
.read_header = wv_read_header,
.read_packet = wv_read_packet,
.read_seek = wv_read_seek,
};
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