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Code Issues Releases Activity

avcodec/atrac3plus: reorder channels to match the output layout

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The order in which the channels are coded in the bitstream do not always follow
the native, bitmask-based order of channels both signaled by the WAV container
and forced by this same decoder. This is the case with layouts containing an
LFE channel, as it's always coded last.

Fixes ticket #9964.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2022-10-31 17:24:47 -03:00
parent 828b0da7b7
commit 3819719099
1 changed files with 15 additions and 1 deletions
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16
libavcodec/atrac3plusdec.c
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@ -48,6 +48,17 @@
#include "atrac.h"
#include "atrac3plus.h"
static const uint8_t channel_map[8][8] = {
{ 0, },
{ 0, 1, },
{ 0, 1, 2, },
{ 0, 1, 2, 3, },
{ 0, },
{ 0, 1, 2, 4, 5, 3, },
{ 0, 1, 2, 4, 5, 6, 3, },
{ 0, 1, 2, 4, 5, 6, 7, 3, },
};
typedef struct ATRAC3PContext {
GetBitContext gb;
AVFloatDSPContext *fdsp;
@ -65,6 +76,7 @@ typedef struct ATRAC3PContext {
int num_channel_blocks; ///< number of channel blocks
uint8_t channel_blocks[5]; ///< channel configuration descriptor
const uint8_t *channel_map; ///< channel layout map
} ATRAC3PContext;
static av_cold int atrac3p_decode_close(AVCodecContext *avctx)
@ -143,6 +155,8 @@ static av_cold int set_channel_params(ATRAC3PContext *ctx,
return AVERROR_INVALIDDATA;
}
ctx->channel_map = channel_map[channels - 1];
return 0;
}
@ -378,7 +392,7 @@ static int atrac3p_decode_frame(AVCodecContext *avctx, AVFrame *frame,
channels_to_process, avctx);
for (i = 0; i < channels_to_process; i++)
memcpy(samples_p[out_ch_index + i], ctx->outp_buf[i],
memcpy(samples_p[ctx->channel_map[out_ch_index + i]], ctx->outp_buf[i],
ATRAC3P_FRAME_SAMPLES * sizeof(**samples_p));
ch_block++;