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Add pcm_lxf, a decoder for the 20-bit planar PCM format used in LXF

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Originally committed as revision 25280 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Tomas Härdin 2010-10-01 11:08:19 +00:00
parent c619572a7b
commit fbeabfca2f
3 changed files with 29 additions and 3 deletions
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1
libavcodec/allcodecs.c
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@ -283,6 +283,7 @@ void avcodec_register_all(void)
REGISTER_ENCDEC (PCM_F32LE, pcm_f32le);
REGISTER_ENCDEC (PCM_F64BE, pcm_f64be);
REGISTER_ENCDEC (PCM_F64LE, pcm_f64le);
REGISTER_DECODER (PCM_LXF, pcm_lxf);
REGISTER_ENCDEC (PCM_MULAW, pcm_mulaw);
REGISTER_ENCDEC (PCM_S8, pcm_s8);
REGISTER_ENCDEC (PCM_S16BE, pcm_s16be);

5
libavcodec/avcodec.h
View File

@ -31,8 +31,8 @@
#include "libavutil/cpu.h"
#define LIBAVCODEC_VERSION_MAJOR 52
#define LIBAVCODEC_VERSION_MINOR 91
#define LIBAVCODEC_VERSION_MICRO 1
#define LIBAVCODEC_VERSION_MINOR 92
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \
@ -276,6 +276,7 @@ enum CodecID {
CODEC_ID_PCM_F64BE,
CODEC_ID_PCM_F64LE,
CODEC_ID_PCM_BLURAY,
CODEC_ID_PCM_LXF,
/* various ADPCM codecs */
CODEC_ID_ADPCM_IMA_QT= 0x11000,

26
libavcodec/pcm.c
View File

@ -259,7 +259,7 @@ static int pcm_decode_frame(AVCodecContext *avctx,
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
PCMDecode *s = avctx->priv_data;
int sample_size, c, n;
int sample_size, c, n, i;
short *samples;
const uint8_t *src, *src8, *src2[MAX_CHANNELS];
uint8_t *dstu8;
@ -288,6 +288,9 @@ static int pcm_decode_frame(AVCodecContext *avctx,
if (CODEC_ID_PCM_DVD == avctx->codec_id)
/* 2 samples are interleaved per block in PCM_DVD */
sample_size = avctx->bits_per_coded_sample * 2 / 8;
else if (avctx->codec_id == CODEC_ID_PCM_LXF)
/* we process 40-bit blocks per channel for LXF */
sample_size = 5;
n = avctx->channels * sample_size;
@ -436,6 +439,26 @@ static int pcm_decode_frame(AVCodecContext *avctx,
}
samples = (short *) dst_int32_t;
break;
case CODEC_ID_PCM_LXF:
dst_int32_t = data;
n /= avctx->channels;
//unpack and de-planerize
for (i = 0; i < n; i++) {
for (c = 0, src8 = src + i*5; c < avctx->channels; c++, src8 += n*5) {
//extract low 20 bits and expand to 32 bits
*dst_int32_t++ = (src8[2] << 28) | (src8[1] << 20) | (src8[0] << 12) |
((src8[2] & 0xF) << 8) | src8[1];
}
for (c = 0, src8 = src + i*5; c < avctx->channels; c++, src8 += n*5) {
//extract high 20 bits and expand to 32 bits
*dst_int32_t++ = (src8[4] << 24) | (src8[3] << 16) |
((src8[2] & 0xF0) << 8) | (src8[4] << 4) | (src8[3] >> 4);
}
}
src += n * avctx->channels * 5;
samples = (short *) dst_int32_t;
break;
default:
return -1;
}
@ -485,6 +508,7 @@ PCM_CODEC (CODEC_ID_PCM_F32BE, SAMPLE_FMT_FLT, pcm_f32be, "PCM 32-bit floating
PCM_CODEC (CODEC_ID_PCM_F32LE, SAMPLE_FMT_FLT, pcm_f32le, "PCM 32-bit floating point little-endian");
PCM_CODEC (CODEC_ID_PCM_F64BE, SAMPLE_FMT_DBL, pcm_f64be, "PCM 64-bit floating point big-endian");
PCM_CODEC (CODEC_ID_PCM_F64LE, SAMPLE_FMT_DBL, pcm_f64le, "PCM 64-bit floating point little-endian");
PCM_DECODER(CODEC_ID_PCM_LXF, SAMPLE_FMT_S32, pcm_lxf, "PCM signed 20-bit little-endian planar");
PCM_CODEC (CODEC_ID_PCM_MULAW, SAMPLE_FMT_S16, pcm_mulaw, "PCM mu-law");
PCM_CODEC (CODEC_ID_PCM_S8, SAMPLE_FMT_U8, pcm_s8, "PCM signed 8-bit");
PCM_CODEC (CODEC_ID_PCM_S16BE, SAMPLE_FMT_S16, pcm_s16be, "PCM signed 16-bit big-endian");