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Remove code duplication. Based on a patch by Matthieu Castet.

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Originally committed as revision 9724 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Vitor Sessak 18 years ago
parent 33ed2d843e
commit 7f26801668
1 changed files with 41 additions and 88 deletions
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  1. 125
      libavcodec/alac.c

125
libavcodec/alac.c
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@ -630,132 +630,85 @@ static int alac_decode_frame(AVCodecContext *avctx,
if (!isnotcompressed) { if (!isnotcompressed) {
/* compressed */ /* compressed */
int16_t predictor_coef_table_a[32]; int16_t predictor_coef_table[channels][32];
int predictor_coef_num_a; int predictor_coef_num[channels];
int prediction_type_a; int prediction_type[channels];
int prediction_quantitization_a; int prediction_quantitization[channels];
int ricemodifier_a; int ricemodifier[channels];
int16_t predictor_coef_table_b[32];
int predictor_coef_num_b;
int prediction_type_b;
int prediction_quantitization_b;
int ricemodifier_b;
int i; int i, chan;
interlacing_shift = get_bits(&alac->gb, 8); interlacing_shift = get_bits(&alac->gb, 8);
interlacing_leftweight = get_bits(&alac->gb, 8); interlacing_leftweight = get_bits(&alac->gb, 8);
/******** channel 1 ***********/ for (chan = 0; chan < channels; chan++) {
prediction_type_a = get_bits(&alac->gb, 4); prediction_type[chan] = get_bits(&alac->gb, 4);
prediction_quantitization_a = get_bits(&alac->gb, 4); prediction_quantitization[chan] = get_bits(&alac->gb, 4);
ricemodifier_a = get_bits(&alac->gb, 3); ricemodifier[chan] = get_bits(&alac->gb, 3);
predictor_coef_num_a = get_bits(&alac->gb, 5); predictor_coef_num[chan] = get_bits(&alac->gb, 5);
/* read the predictor table */ /* read the predictor table */
for (i = 0; i < predictor_coef_num_a; i++) { for (i = 0; i < predictor_coef_num[chan]; i++) {
predictor_coef_table_a[i] = (int16_t)get_bits(&alac->gb, 16); predictor_coef_table[chan][i] = (int16_t)get_bits(&alac->gb, 16);
} }
/******** channel 2 *********/
prediction_type_b = get_bits(&alac->gb, 4);
prediction_quantitization_b = get_bits(&alac->gb, 4);
ricemodifier_b = get_bits(&alac->gb, 3);
predictor_coef_num_b = get_bits(&alac->gb, 5);
/* read the predictor table */
for (i = 0; i < predictor_coef_num_b; i++) {
predictor_coef_table_b[i] = (int16_t)get_bits(&alac->gb, 16);
} }
/*********************/
if (wasted_bytes) { if (wasted_bytes) {
/* see mono case */ /* see mono case */
av_log(avctx, AV_LOG_ERROR, "FIXME: unimplemented, unhandling of wasted_bytes\n"); av_log(avctx, AV_LOG_ERROR, "FIXME: unimplemented, unhandling of wasted_bytes\n");
} }
/* channel 1 */ for (chan = 0; chan < channels; chan++) {
bastardized_rice_decompress(alac, bastardized_rice_decompress(alac,
alac->predicterror_buffer[0], alac->predicterror_buffer[chan],
outputsamples, outputsamples,
readsamplesize, readsamplesize,
alac->setinfo_rice_initialhistory, alac->setinfo_rice_initialhistory,
alac->setinfo_rice_kmodifier, alac->setinfo_rice_kmodifier,
ricemodifier_a * alac->setinfo_rice_historymult / 4, ricemodifier[chan] * alac->setinfo_rice_historymult / 4,
(1 << alac->setinfo_rice_kmodifier) - 1); (1 << alac->setinfo_rice_kmodifier) - 1);
if (prediction_type_a == 0) { if (prediction_type[chan] == 0) {
/* adaptive fir */ /* adaptive fir */
predictor_decompress_fir_adapt(alac->predicterror_buffer[0], predictor_decompress_fir_adapt(alac->predicterror_buffer[chan],
alac->outputsamples_buffer[0], alac->outputsamples_buffer[chan],
outputsamples, outputsamples,
readsamplesize, readsamplesize,
predictor_coef_table_a, predictor_coef_table[chan],
predictor_coef_num_a, predictor_coef_num[chan],
prediction_quantitization_a); prediction_quantitization[chan]);
} else { } else {
/* see mono case */ /* see mono case */
av_log(avctx, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type_a); av_log(avctx, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type[chan]);
} }
/* channel 2 */
bastardized_rice_decompress(alac,
alac->predicterror_buffer[1],
outputsamples,
readsamplesize,
alac->setinfo_rice_initialhistory,
alac->setinfo_rice_kmodifier,
ricemodifier_b * alac->setinfo_rice_historymult / 4,
(1 << alac->setinfo_rice_kmodifier) - 1);
if (prediction_type_b == 0) {
/* adaptive fir */
predictor_decompress_fir_adapt(alac->predicterror_buffer[1],
alac->outputsamples_buffer[1],
outputsamples,
readsamplesize,
predictor_coef_table_b,
predictor_coef_num_b,
prediction_quantitization_b);
} else {
av_log(avctx, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type_b);
} }
} else { } else {
/* not compressed, easy case */ /* not compressed, easy case */
if (alac->setinfo_sample_size <= 16) { if (alac->setinfo_sample_size <= 16) {
int i; int i, chan;
for (chan = 0; chan < channels; chan++) {
for (i = 0; i < outputsamples; i++) { for (i = 0; i < outputsamples; i++) {
int32_t audiobits_a, audiobits_b; int32_t audiobits;
audiobits_a = get_bits(&alac->gb, alac->setinfo_sample_size);
audiobits_b = get_bits(&alac->gb, alac->setinfo_sample_size);
audiobits_a = SIGN_EXTENDED32(audiobits_a, alac->setinfo_sample_size);
audiobits_b = SIGN_EXTENDED32(audiobits_b, alac->setinfo_sample_size);
alac->outputsamples_buffer[0][i] = audiobits_a; audiobits = get_bits(&alac->gb, alac->setinfo_sample_size);
alac->outputsamples_buffer[1][i] = audiobits_b; audiobits = SIGN_EXTENDED32(audiobits, alac->setinfo_sample_size);
alac->outputsamples_buffer[chan][i] = audiobits;
}
} }
} else { } else {
int i; int i, chan;
for (chan = 0; chan < channels; chan++) {
for (i = 0; i < outputsamples; i++) { for (i = 0; i < outputsamples; i++) {
int32_t audiobits_a, audiobits_b; int32_t audiobits;
audiobits_a = get_bits(&alac->gb, 16);
audiobits_a = audiobits_a << 16;
audiobits_a = audiobits_a >> (32 - alac->setinfo_sample_size);
audiobits_a |= get_bits(&alac->gb, alac->setinfo_sample_size - 16);
audiobits_b = get_bits(&alac->gb, 16); audiobits = get_bits(&alac->gb, 16);
audiobits_b = audiobits_b << 16; audiobits = audiobits << 16;
audiobits_b = audiobits_b >> (32 - alac->setinfo_sample_size); audiobits = audiobits >> (32 - alac->setinfo_sample_size);
audiobits_b |= get_bits(&alac->gb, alac->setinfo_sample_size - 16); audiobits |= get_bits(&alac->gb, alac->setinfo_sample_size - 16);
alac->outputsamples_buffer[0][i] = audiobits_a; alac->outputsamples_buffer[chan][i] = audiobits;
alac->outputsamples_buffer[1][i] = audiobits_b; }
} }
} }
/* wasted_bytes = 0; */ /* wasted_bytes = 0; */

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