* Copyright (c) 2005 David Hammerton
* All rights reserved.
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
* 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
*/
alac->outputsamples_buffer_b = av_malloc(alac->setinfo_max_samples_per_frame * 4);
}
-void alac_set_info(ALACContext *alac)
+static int alac_set_info(ALACContext *alac)
{
unsigned char *ptr = alac->avctx->extradata;
ptr += 4; /* alac */
ptr += 4; /* 0 ? */
+ if(BE_32(ptr) >= UINT_MAX/4){
+ av_log(alac->avctx, AV_LOG_ERROR, "setinfo_max_samples_per_frame too large\n");
+ return -1;
+ }
alac->setinfo_max_samples_per_frame = BE_32(ptr); /* buffer size / 2 ? */
ptr += 4;
alac->setinfo_7a = *ptr++;
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);
+
+ return 0;
}
/* hideously inefficient. could use a bitmask search,
return i;
}
-void bastardized_rice_decompress(ALACContext *alac,
+static void bastardized_rice_decompress(ALACContext *alac,
int32_t *output_buffer,
int output_size,
int readsamplesize, /* arg_10 */
}
}
-void deinterlace_16(int32_t *buffer_a, int32_t *buffer_b,
+static void deinterlace_16(int32_t *buffer_a, int32_t *buffer_b,
int16_t *buffer_out,
int numchannels, int numsamples,
uint8_t interlacing_shift,
/* 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;
}
- alac_set_info(alac);
+ if (alac_set_info(alac)) {
+ av_log(avctx, AV_LOG_ERROR, "alac: set_info failed\n");
+ return input_buffer_size;
+ }
alac->context_initialized = 1;
}
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);
/* 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,
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, ...)
int i;
for (i = 0; i < outputsamples; i++) {
int16_t sample = alac->outputsamples_buffer_a[i];
- sample = be2me_16(sample);
((int16_t*)outbuffer)[i * alac->numchannels] = sample;
}
break;
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;
/*********************/
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 */
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 */
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 */
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;
projects / ffmpeg / blobdiff