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explain extradata and pass avctx to av_log's 

Originally committed as revision 5042 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Beregszaszi 2006-02-21 00:03:10 +00:00
parent b0ca57356e
commit a1db1fc445
1 changed files with 29 additions and 13 deletions
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42
libavcodec/alac.c
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@ -32,6 +32,22 @@
* bytes 0-3 atom size (0x24), big-endian
* bytes 4-7 atom type ('alac', not the 'alac' tag from start of stsd)
* bytes 8-35 data bytes needed by decoder
*
* Extradata:
* 32bit size
* 32bit tag (=alac)
* 32bit zero?
* 32bit max sample per frame
* 8bit ?? (zero?)
* 8bit sample size
* 8bit history mult
* 8bit initial history
* 8bit kmodifier
* 8bit channels?
* 16bit ??
* 32bit max coded frame size
* 32bit bitrate?
* 32bit samplerate
*/
@ -99,14 +115,14 @@ static void alac_set_info(ALACContext *alac)
alac->setinfo_rice_historymult = *ptr++;
alac->setinfo_rice_initialhistory = *ptr++;
alac->setinfo_rice_kmodifier = *ptr++;
alac->setinfo_7f = *ptr++;
alac->setinfo_7f = *ptr++; // channels?
alac->setinfo_80 = BE_16(ptr);
ptr += 2;
alac->setinfo_82 = BE_32(ptr);
alac->setinfo_82 = BE_32(ptr); // max coded frame size
ptr += 4;
alac->setinfo_86 = BE_32(ptr);
alac->setinfo_86 = BE_32(ptr); // bitrate ?
ptr += 4;
alac->setinfo_8a_rate = BE_32(ptr);
alac->setinfo_8a_rate = BE_32(ptr); // samplerate
ptr += 4;
allocate_buffers(alac);
@ -444,7 +460,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
/* initialize from the extradata */
if (!alac->context_initialized) {
if (alac->avctx->extradata_size != ALAC_EXTRADATA_SIZE) {
av_log(NULL, AV_LOG_ERROR, "alac: expected %d extradata bytes\n",
av_log(avctx, AV_LOG_ERROR, "alac: expected %d extradata bytes\n",
ALAC_EXTRADATA_SIZE);
return input_buffer_size;
}
@ -500,7 +516,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
int prediction_quantitization;
int i;
/* skip 16 bits, not sure what they are. seem to be used in
/* FIXME: skip 16 bits, not sure what they are. seem to be used in
* two channel case */
get_bits(&alac->gb, 8);
get_bits(&alac->gb, 8);
@ -520,7 +536,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
/* these bytes seem to have something to do with
* > 2 channel files.
*/
av_log(NULL, AV_LOG_ERROR, "FIXME: unimplemented, unhandling of wasted_bytes\n");
av_log(avctx, AV_LOG_ERROR, "FIXME: unimplemented, unhandling of wasted_bytes\n");
}
bastardized_rice_decompress(alac,
@ -542,7 +558,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
predictor_coef_num,
prediction_quantitization);
} else {
av_log(NULL, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type);
av_log(avctx, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type);
/* 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, ...)
@ -594,7 +610,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
case 20:
case 24:
case 32:
av_log(NULL, AV_LOG_ERROR, "FIXME: unimplemented sample size %i\n", alac->setinfo_sample_size);
av_log(avctx, AV_LOG_ERROR, "FIXME: unimplemented sample size %i\n", alac->setinfo_sample_size);
break;
default:
break;
@ -679,7 +695,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
/*********************/
if (wasted_bytes) {
/* see mono case */
av_log(NULL, 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 */
@ -703,7 +719,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
prediction_quantitization_a);
} else {
/* see mono case */
av_log(NULL, 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_a);
}
/* channel 2 */
@ -726,7 +742,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
predictor_coef_num_b,
prediction_quantitization_b);
} else {
av_log(NULL, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type_b);
av_log(avctx, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type_b);
}
} else {
/* not compressed, easy case */
@ -782,7 +798,7 @@ static int alac_decode_frame(AVCodecContext *avctx,
case 20:
case 24:
case 32:
av_log(NULL, AV_LOG_ERROR, "FIXME: unimplemented sample size %i\n", alac->setinfo_sample_size);
av_log(avctx, AV_LOG_ERROR, "FIXME: unimplemented sample size %i\n", alac->setinfo_sample_size);
break;
default:
break;