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alacdec: move some declarations to the top of the function

This commit is contained in:
Justin Ruggles 2011-10-09 14:19:32 -04:00
parent c3a92412c0
commit 01200f1283
1 changed files with 21 additions and 25 deletions
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46
libavcodec/alac.c
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@ -366,6 +366,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
int isnotcompressed;
uint8_t interlacing_shift;
uint8_t interlacing_leftweight;
int i, ch;
/* short-circuit null buffers */
if (!inbuffer || !input_buffer_size)
@ -425,51 +426,49 @@ static int alac_decode_frame(AVCodecContext *avctx,
int prediction_type[MAX_CHANNELS];
int prediction_quantitization[MAX_CHANNELS];
int ricemodifier[MAX_CHANNELS];
int i, chan;
interlacing_shift = get_bits(&alac->gb, 8);
interlacing_leftweight = get_bits(&alac->gb, 8);
for (chan = 0; chan < channels; chan++) {
prediction_type[chan] = get_bits(&alac->gb, 4);
prediction_quantitization[chan] = get_bits(&alac->gb, 4);
for (ch = 0; ch < channels; ch++) {
prediction_type[ch] = get_bits(&alac->gb, 4);
prediction_quantitization[ch] = get_bits(&alac->gb, 4);
ricemodifier[chan] = get_bits(&alac->gb, 3);
predictor_coef_num[chan] = get_bits(&alac->gb, 5);
ricemodifier[ch] = get_bits(&alac->gb, 3);
predictor_coef_num[ch] = get_bits(&alac->gb, 5);
/* read the predictor table */
for (i = 0; i < predictor_coef_num[chan]; i++)
predictor_coef_table[chan][i] = (int16_t)get_bits(&alac->gb, 16);
for (i = 0; i < predictor_coef_num[ch]; i++)
predictor_coef_table[ch][i] = (int16_t)get_bits(&alac->gb, 16);
}
if (alac->extra_bits) {
int i, ch;
for (i = 0; i < outputsamples; i++) {
for (ch = 0; ch < channels; ch++)
alac->extra_bits_buffer[ch][i] = get_bits(&alac->gb, alac->extra_bits);
}
}
for (chan = 0; chan < channels; chan++) {
for (ch = 0; ch < channels; ch++) {
bastardized_rice_decompress(alac,
alac->predicterror_buffer[chan],
alac->predicterror_buffer[ch],
outputsamples,
readsamplesize,
alac->setinfo_rice_initialhistory,
alac->setinfo_rice_kmodifier,
ricemodifier[chan] * alac->setinfo_rice_historymult / 4,
ricemodifier[ch] * alac->setinfo_rice_historymult / 4,
(1 << alac->setinfo_rice_kmodifier) - 1);
if (prediction_type[chan] == 0) {
if (prediction_type[ch] == 0) {
/* adaptive fir */
predictor_decompress_fir_adapt(alac->predicterror_buffer[chan],
alac->outputsamples_buffer[chan],
predictor_decompress_fir_adapt(alac->predicterror_buffer[ch],
alac->outputsamples_buffer[ch],
outputsamples,
readsamplesize,
predictor_coef_table[chan],
predictor_coef_num[chan],
prediction_quantitization[chan]);
predictor_coef_table[ch],
predictor_coef_num[ch],
prediction_quantitization[ch]);
} else {
av_log(avctx, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type[chan]);
av_log(avctx, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type[ch]);
/* I think the only other prediction type (or perhaps this is
* just a boolean?) runs adaptive fir twice.. like:
* predictor_decompress_fir_adapt(predictor_error, tempout, ...)
@ -480,11 +479,10 @@ static int alac_decode_frame(AVCodecContext *avctx,
}
} else {
/* not compressed, easy case */
int i, chan;
for (i = 0; i < outputsamples; i++) {
for (chan = 0; chan < channels; chan++) {
alac->outputsamples_buffer[chan][i] = get_sbits_long(&alac->gb,
alac->setinfo_sample_size);
for (ch = 0; ch < channels; ch++) {
alac->outputsamples_buffer[ch][i] = get_sbits_long(&alac->gb,
alac->setinfo_sample_size);
}
}
alac->extra_bits = 0;
@ -510,7 +508,6 @@ static int alac_decode_frame(AVCodecContext *avctx,
interleave_stereo_16(alac->outputsamples_buffer, outbuffer,
outputsamples);
} else {
int i;
for (i = 0; i < outputsamples; i++) {
((int16_t*)outbuffer)[i] = alac->outputsamples_buffer[0][i];
}
@ -521,7 +518,6 @@ static int alac_decode_frame(AVCodecContext *avctx,
interleave_stereo_24(alac->outputsamples_buffer, outbuffer,
outputsamples);
} else {
int i;
for (i = 0; i < outputsamples; i++)
((int32_t *)outbuffer)[i] = alac->outputsamples_buffer[0][i] << 8;
}