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Prepare to remove more duplicated code 

Based on a patch by Matthieu Castet

Originally committed as revision 9576 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2007-07-10 14:30:57 +00:00
parent a562e2e651
commit 153696a663
1 changed files with 33 additions and 31 deletions
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64
libavcodec/alac.c
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@ -57,6 +57,7 @@
#include "bitstream.h"
#define ALAC_EXTRADATA_SIZE 36
#define MAX_CHANNELS 2
typedef struct {
@ -71,11 +72,9 @@ typedef struct {
int bytespersample;
/* buffers */
int32_t *predicterror_buffer_a;
int32_t *predicterror_buffer_b;
int32_t *predicterror_buffer[MAX_CHANNELS];
int32_t *outputsamples_buffer_a;
int32_t *outputsamples_buffer_b;
int32_t *outputsamples_buffer[MAX_CHANNELS];
/* stuff from setinfo */
uint32_t setinfo_max_samples_per_frame; /* 0x1000 = 4096 */ /* max samples per frame? */
@ -95,11 +94,14 @@ typedef struct {
static void allocate_buffers(ALACContext *alac)
{
alac->predicterror_buffer_a = av_malloc(alac->setinfo_max_samples_per_frame * 4);
alac->predicterror_buffer_b = av_malloc(alac->setinfo_max_samples_per_frame * 4);
int chan;
for (chan = 0; chan < MAX_CHANNELS; chan++) {
alac->predicterror_buffer[chan] =
av_malloc(alac->setinfo_max_samples_per_frame * 4);
alac->outputsamples_buffer_a = av_malloc(alac->setinfo_max_samples_per_frame * 4);
alac->outputsamples_buffer_b = av_malloc(alac->setinfo_max_samples_per_frame * 4);
alac->outputsamples_buffer[chan] =
av_malloc(alac->setinfo_max_samples_per_frame * 4);
}
}
static int alac_set_info(ALACContext *alac)
@ -546,7 +548,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
}
bastardized_rice_decompress(alac,
alac->predicterror_buffer_a,
alac->predicterror_buffer[0],
outputsamples,
readsamplesize,
alac->setinfo_rice_initialhistory,
@ -556,8 +558,8 @@ static int alac_decode_frame(AVCodecContext *avctx,
if (prediction_type == 0) {
/* adaptive fir */
predictor_decompress_fir_adapt(alac->predicterror_buffer_a,
alac->outputsamples_buffer_a,
predictor_decompress_fir_adapt(alac->predicterror_buffer[0],
alac->outputsamples_buffer[0],
outputsamples,
readsamplesize,
predictor_coef_table,
@ -582,7 +584,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
audiobits = SIGN_EXTENDED32(audiobits, readsamplesize);
alac->outputsamples_buffer_a[i] = audiobits;
alac->outputsamples_buffer[0][i] = audiobits;
}
} else {
int i;
@ -597,7 +599,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
audiobits |= get_bits(&alac->gb, readsamplesize - 16);
alac->outputsamples_buffer_a[i] = audiobits;
alac->outputsamples_buffer[0][i] = audiobits;
}
}
/* wasted_bytes = 0; // unused */
@ -607,7 +609,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
case 16: {
int i;
for (i = 0; i < outputsamples; i++) {
int16_t sample = alac->outputsamples_buffer_a[i];
int16_t sample = alac->outputsamples_buffer[0][i];
((int16_t*)outbuffer)[i * alac->numchannels] = sample;
}
break;
@ -677,7 +679,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
/* channel 1 */
bastardized_rice_decompress(alac,
alac->predicterror_buffer_a,
alac->predicterror_buffer[0],
outputsamples,
readsamplesize,
alac->setinfo_rice_initialhistory,
@ -687,8 +689,8 @@ static int alac_decode_frame(AVCodecContext *avctx,
if (prediction_type_a == 0) {
/* adaptive fir */
predictor_decompress_fir_adapt(alac->predicterror_buffer_a,
alac->outputsamples_buffer_a,
predictor_decompress_fir_adapt(alac->predicterror_buffer[0],
alac->outputsamples_buffer[0],
outputsamples,
readsamplesize,
predictor_coef_table_a,
@ -701,7 +703,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
/* channel 2 */
bastardized_rice_decompress(alac,
alac->predicterror_buffer_b,
alac->predicterror_buffer[1],
outputsamples,
readsamplesize,
alac->setinfo_rice_initialhistory,
@ -711,8 +713,8 @@ static int alac_decode_frame(AVCodecContext *avctx,
if (prediction_type_b == 0) {
/* adaptive fir */
predictor_decompress_fir_adapt(alac->predicterror_buffer_b,
alac->outputsamples_buffer_b,
predictor_decompress_fir_adapt(alac->predicterror_buffer[1],
alac->outputsamples_buffer[1],
outputsamples,
readsamplesize,
predictor_coef_table_b,
@ -734,8 +736,8 @@ static int alac_decode_frame(AVCodecContext *avctx,
audiobits_a = SIGN_EXTENDED32(audiobits_a, alac->setinfo_sample_size);
audiobits_b = SIGN_EXTENDED32(audiobits_b, alac->setinfo_sample_size);
alac->outputsamples_buffer_a[i] = audiobits_a;
alac->outputsamples_buffer_b[i] = audiobits_b;
alac->outputsamples_buffer[0][i] = audiobits_a;
alac->outputsamples_buffer[1][i] = audiobits_b;
}
} else {
int i;
@ -752,8 +754,8 @@ static int alac_decode_frame(AVCodecContext *avctx,
audiobits_b = audiobits_b >> (32 - alac->setinfo_sample_size);
audiobits_b |= get_bits(&alac->gb, alac->setinfo_sample_size - 16);
alac->outputsamples_buffer_a[i] = audiobits_a;
alac->outputsamples_buffer_b[i] = audiobits_b;
alac->outputsamples_buffer[0][i] = audiobits_a;
alac->outputsamples_buffer[1][i] = audiobits_b;
}
}
/* wasted_bytes = 0; */
@ -763,8 +765,8 @@ static int alac_decode_frame(AVCodecContext *avctx,
switch(alac->setinfo_sample_size) {
case 16: {
deinterlace_16(alac->outputsamples_buffer_a,
alac->outputsamples_buffer_b,
deinterlace_16(alac->outputsamples_buffer[0],
alac->outputsamples_buffer[1],
(int16_t*)outbuffer,
alac->numchannels,
outputsamples,
@ -805,11 +807,11 @@ static int alac_decode_close(AVCodecContext *avctx)
{
ALACContext *alac = avctx->priv_data;
av_free(alac->predicterror_buffer_a);
av_free(alac->predicterror_buffer_b);
av_free(alac->outputsamples_buffer_a);
av_free(alac->outputsamples_buffer_b);
int chan;
for (chan = 0; chan < MAX_CHANNELS; chan++) {
av_free(alac->predicterror_buffer[chan]);
av_free(alac->outputsamples_buffer[chan]);
}
return 0;
}