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wavpack: extract channel information from the bitstream

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This way we don't require the caller to parse the block header. It also
allows the channel configuration to change mid-stream.
This commit is contained in:
Anton Khirnov
2013-05-27 17:23:15 +02:00
parent 78f75b6fa4
commit 7d039e70a5
1 changed files with 18 additions and 17 deletions
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35
libavcodec/wavpack.c
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@@ -43,6 +43,10 @@
#define WV_HYBRID_SHAPE 0x00000008
#define WV_HYBRID_BITRATE 0x00000200
#define WV_HYBRID_BALANCE 0x00000400
#define WV_INITIAL_BLOCK 0x00000800
#define WV_FINAL_BLOCK 0x00001000
#define WV_SINGLE_BLOCK (WV_INITIAL_BLOCK | WV_FINAL_BLOCK)
#define WV_FLT_SHIFT_ONES 0x01
#define WV_FLT_SHIFT_SAME 0x02
@@ -135,7 +139,6 @@ typedef struct WavpackContext {
WavpackFrameContext *fdec[WV_MAX_FRAME_DECODERS];
int fdec_num;
int multichannel;
int block;
int samples;
int ch_offset;
@@ -724,12 +727,6 @@ static av_cold int wavpack_decode_init(AVCodecContext *avctx)
s->avctx = avctx;
if (avctx->channels <= 2 && !avctx->channel_layout)
avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO
: AV_CH_LAYOUT_MONO;
s->multichannel = avctx->channels > 2;
s->fdec_num = 0;
return 0;
@@ -758,7 +755,8 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
int got_terms = 0, got_weights = 0, got_samples = 0,
got_entropy = 0, got_bs = 0, got_float = 0, got_hybrid = 0;
int i, j, id, size, ssize, weights, t;
int bpp, chan, chmask, orig_bpp, sample_rate = 0;
int bpp, chan = 0, chmask = 0, orig_bpp, sample_rate = 0;
int multiblock;
if (block_no >= wc->fdec_num && wv_alloc_frame_context(wc) < 0) {
av_log(avctx, AV_LOG_ERROR, "Error creating frame decode context\n");
@@ -789,6 +787,7 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
s->frame_flags = bytestream2_get_le32(&gb);
bpp = av_get_bytes_per_sample(avctx->sample_fmt);
orig_bpp = ((s->frame_flags & 0x03) + 1) << 3;
multiblock = (s->frame_flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK;
s->stereo = !(s->frame_flags & WV_MONO);
s->stereo_in = (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;
@@ -1039,15 +1038,6 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
chan = avctx->channels;
chmask = avctx->channel_layout;
}
if (chan != avctx->channels) {
av_log(avctx, AV_LOG_ERROR,
"Block reports total %d channels, "
"decoder believes it's %d channels\n",
chan, avctx->channels);
return AVERROR_INVALIDDATA;
}
if (!avctx->channel_layout)
avctx->channel_layout = chmask;
break;
case WP_ID_SAMPLE_RATE:
if (size != 3) {
@@ -1111,6 +1101,17 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
} else
avctx->sample_rate = wv_rates[sr];
if (multiblock) {
if (chan)
avctx->channels = chan;
if (chmask)
avctx->channel_layout = chmask;
} else {
avctx->channels = s->stereo ? 2 : 1;
avctx->channel_layout = s->stereo ? AV_CH_LAYOUT_STEREO :
AV_CH_LAYOUT_MONO;
}
/* get output buffer */
frame->nb_samples = s->samples;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {