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wavpack demuxer: export full wavpack blocks.

Browse Source 
Currently the demuxer shaves the blocks and exports only the
information that is useful to the decoder.

Exporting the blocks just as they are stored is simpler to understand
and will make remuxing wavpack easier.
pull/23/head
Anton Khirnov 12 years ago
parent 72dee5f40b
commit 5074f4545c
2 changed files with 56 additions and 91 deletions
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  1. 33
      libavcodec/wavpack.c
  2. 114
      libavformat/wv.c

33
libavcodec/wavpack.c
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@ -33,6 +33,8 @@
* WavPack lossless audio decoder
*/
#define WV_HEADER_SIZE 32
#define WV_MONO 0x00000004
#define WV_JOINT_STEREO 0x00000010
#define WV_FALSE_STEREO 0x40000000
@ -1145,7 +1147,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx, void *data,
AVFrame *frame = data;
int frame_size, ret, frame_flags;
if (avpkt->size < 12 + s->multichannel * 4)
if (avpkt->size <= WV_HEADER_SIZE)
return AVERROR_INVALIDDATA;
s->block = 0;
@ -1157,13 +1159,8 @@ static int wavpack_decode_frame(AVCodecContext *avctx, void *data,
buf += 4;
frame_flags = AV_RL32(buf);
} else {
if (s->multichannel) {
s->samples = AV_RL32(buf + 4);
frame_flags = AV_RL32(buf + 8);
} else {
s->samples = AV_RL32(buf);
frame_flags = AV_RL32(buf + 4);
}
s->samples = AV_RL32(buf + 20);
frame_flags = AV_RL32(buf + 24);
}
if (s->samples <= 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid number of samples: %d\n",
@ -1188,18 +1185,16 @@ static int wavpack_decode_frame(AVCodecContext *avctx, void *data,
}
while (buf_size > 0) {
if (!s->multichannel) {
frame_size = buf_size;
if (!s->mkv_mode) {
if (buf_size <= WV_HEADER_SIZE)
break;
frame_size = AV_RL32(buf + 4) - 12;
buf += 20;
buf_size -= 20;
} else {
if (!s->mkv_mode) {
frame_size = AV_RL32(buf) - 12;
buf += 4;
buf_size -= 4;
} else {
if (buf_size < 12) // MKV files can have zero flags after last block
break;
frame_size = AV_RL32(buf + 8) + 12;
}
if (buf_size < 12) // MKV files can have zero flags after last block
break;
frame_size = AV_RL32(buf + 8) + 12;
}
if (frame_size <= 0 || frame_size > buf_size) {
av_log(avctx, AV_LOG_ERROR,

114
libavformat/wv.c
Unescape View File

@ -30,7 +30,7 @@
// specs say that maximum block size is 1Mb
#define WV_BLOCK_LIMIT 1047576
#define WV_EXTRA_SIZE 12
#define WV_HEADER_SIZE 32
#define WV_START_BLOCK 0x0800
#define WV_END_BLOCK 0x1000
@ -56,13 +56,13 @@ static const int wv_rates[16] = {
};
typedef struct {
uint8_t block_header[WV_HEADER_SIZE];
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;
int64_t apetag_start;
@ -80,12 +80,11 @@ static int wv_probe(AVProbeData *p)
return 0;
}
static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb,
int append)
static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
{
WVContext *wc = ctx->priv_data;
uint32_t tag, ver;
int size;
uint32_t ver;
int size, ret;
int rate, bpp, chan;
uint32_t chmask;
@ -95,33 +94,30 @@ static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb,
if (wc->apetag_start && wc->pos >= wc->apetag_start)
return AVERROR_EOF;
if (!append) {
tag = avio_rl32(pb);
if (tag != MKTAG('w', 'v', 'p', 'k'))
return AVERROR_INVALIDDATA;
size = avio_rl32(pb);
if (size < 24 || size > WV_BLOCK_LIMIT) {
av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
return AVERROR_INVALIDDATA;
}
wc->blksize = size;
ver = avio_rl16(pb);
if (ver < 0x402 || ver > 0x410) {
av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
return AVERROR_PATCHWELCOME;
}
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;
ret = avio_read(pb, wc->block_header, WV_HEADER_SIZE);
if (ret != WV_HEADER_SIZE)
return (ret < 0) ? ret : AVERROR_EOF;
if (AV_RL32(wc->block_header) != MKTAG('w', 'v', 'p', 'k'))
return AVERROR_INVALIDDATA;
size = AV_RL32(wc->block_header + 4);
if (size < 24 || size > WV_BLOCK_LIMIT) {
av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
return AVERROR_INVALIDDATA;
}
wc->blksize = size;
ver = AV_RL32(wc->block_header + 8);
if (ver < 0x402 || ver > 0x410) {
av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
return AVERROR_PATCHWELCOME;
}
wc->flags = AV_RL32(wc->extra + 4);
wc->samples = AV_RL32(wc->block_header + 12); // total samples in file
wc->soff = AV_RL32(wc->block_header + 16); // offset in samples of current block
wc->flags = AV_RL32(wc->block_header + 24);
/* Blocks with zero samples don't contain actual audio information
* and should be ignored */
if (!AV_RN32(wc->extra))
if (!AV_RN32(wc->block_header + 20))
return 0;
// parse flags
bpp = ((wc->flags & 3) + 1) << 3;
@ -235,9 +231,9 @@ static int wv_read_header(AVFormatContext *s)
wc->block_parsed = 0;
for (;;) {
if ((ret = wv_read_block_header(s, pb, 0)) < 0)
if ((ret = wv_read_block_header(s, pb)) < 0)
return ret;
if (!AV_RN32(wc->extra))
if (!AV_RL32(wc->block_header + 20))
avio_skip(pb, wc->blksize - 24);
else
break;
@ -272,75 +268,49 @@ static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
WVContext *wc = s->priv_data;
int ret;
int size, ver, off;
int off;
int64_t pos;
uint32_t block_samples;
if (s->pb->eof_reached)
return AVERROR_EOF;
if (wc->block_parsed) {
if ((ret = wv_read_block_header(s, s->pb, 0)) < 0)
if ((ret = wv_read_block_header(s, s->pb)) < 0)
return ret;
}
pos = wc->pos;
off = wc->multichannel ? 4 : 0;
if (av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE + off) < 0)
if (av_new_packet(pkt, wc->blksize + WV_HEADER_SIZE) < 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);
memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE);
ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, 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 AVERROR_INVALIDDATA;
}
if ((ret = av_append_packet(s->pb, pkt, 4)) < 0) {
if ((ret = wv_read_block_header(s, s->pb)) < 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 AVERROR_INVALIDDATA;
}
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 AVERROR_PATCHWELCOME;
}
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 ((ret = wv_read_block_header(s, s->pb, 1)) < 0) {
off = pkt->size;
if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->blksize)) < 0) {
av_free_packet(pkt);
return ret;
}
ret = av_append_packet(s->pb, pkt, wc->blksize);
if (ret < 0) {
memcpy(pkt->data + off, wc->block_header, WV_HEADER_SIZE);
ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->blksize);
if (ret != wc->blksize) {
av_free_packet(pkt);
return ret;
return (ret < 0) ? ret : AVERROR_EOF;
}
}
pkt->stream_index = 0;
wc->block_parsed = 1;
pkt->pts = wc->soff;
block_samples = AV_RN32(wc->extra);
block_samples = AV_RL32(wc->block_header + 20);
if (block_samples > INT32_MAX)
av_log(s, AV_LOG_WARNING,
"Too many samples in block: %"PRIu32"\n", block_samples);

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