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aacdec: Add support for Error Resilience syntax.

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This does not add support for any error resilience tools.
pull/36/head
Alex Converse 11 years ago
parent c4bfa09807
commit 5cdefc0207
2 changed files with 103 additions and 10 deletions
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  1. 1
      Changelog
  2. 112
      libavcodec/aacdec.c

1
Changelog
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@ -34,6 +34,7 @@ version 10:
data read from an input file
- incomplete Voxware MetaSound decoder
- WebP decoder
- Error Resilient AAC syntax (ER AAC LC) decoding
version 9:

112
libavcodec/aacdec.c
Unescape View File

@ -706,7 +706,7 @@ static int decode_ga_specific_config(AACContext *ac, AVCodecContext *avctx,
MPEG4AudioConfig *m4ac,
int channel_config)
{
int extension_flag, ret;
int extension_flag, ret, ep_config, res_flags;
uint8_t layout_map[MAX_ELEM_ID*4][3];
int tags = 0;
@ -752,14 +752,30 @@ static int decode_ga_specific_config(AACContext *ac, AVCodecContext *avctx,
case AOT_ER_AAC_LTP:
case AOT_ER_AAC_SCALABLE:
case AOT_ER_AAC_LD:
skip_bits(gb, 3); /* aacSectionDataResilienceFlag
* aacScalefactorDataResilienceFlag
* aacSpectralDataResilienceFlag
*/
res_flags = get_bits(gb, 3);
if (res_flags) {
av_log(avctx, AV_LOG_ERROR,
"AAC data resilience not supported (flags %x)\n",
res_flags);
return AVERROR_PATCHWELCOME;
}
break;
}
skip_bits1(gb); // extensionFlag3 (TBD in version 3)
}
switch (m4ac->object_type) {
case AOT_ER_AAC_LC:
case AOT_ER_AAC_LTP:
case AOT_ER_AAC_SCALABLE:
case AOT_ER_AAC_LD:
ep_config = get_bits(gb, 2);
if (ep_config) {
av_log(avctx, AV_LOG_ERROR,
"epConfig %d is not supported.\n",
ep_config);
return AVERROR_PATCHWELCOME;
}
}
return 0;
}
@ -808,6 +824,7 @@ static int decode_audio_specific_config(AACContext *ac,
case AOT_AAC_MAIN:
case AOT_AAC_LC:
case AOT_AAC_LTP:
case AOT_ER_AAC_LC:
if ((ret = decode_ga_specific_config(ac, avctx, &gb,
m4ac, m4ac->chan_config)) < 0)
return ret;
@ -1079,7 +1096,8 @@ static int decode_ics_info(AACContext *ac, IndividualChannelStream *ics,
if (decode_prediction(ac, ics, gb)) {
return AVERROR_INVALIDDATA;
}
} else if (ac->oc[1].m4ac.object_type == AOT_AAC_LC) {
} else if (ac->oc[1].m4ac.object_type == AOT_AAC_LC ||
ac->oc[1].m4ac.object_type == AOT_ER_AAC_LC) {
av_log(ac->avctx, AV_LOG_ERROR,
"Prediction is not allowed in AAC-LC.\n");
return AVERROR_INVALIDDATA;
@ -1701,7 +1719,7 @@ static int decode_ics(AACContext *ac, SingleChannelElement *sce,
TemporalNoiseShaping *tns = &sce->tns;
IndividualChannelStream *ics = &sce->ics;
float *out = sce->coeffs;
int global_gain, pulse_present = 0;
int global_gain, er_syntax, pulse_present = 0;
int ret;
/* This assignment is to silence a GCC warning about the variable being used
@ -1724,6 +1742,9 @@ static int decode_ics(AACContext *ac, SingleChannelElement *sce,
return ret;
pulse_present = 0;
er_syntax = ac->oc[1].m4ac.object_type == AOT_ER_AAC_LC ||
ac->oc[1].m4ac.object_type == AOT_ER_AAC_LTP ||
ac->oc[1].m4ac.object_type == AOT_ER_AAC_LD;
if (!scale_flag) {
if ((pulse_present = get_bits1(gb))) {
if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
@ -1737,12 +1758,19 @@ static int decode_ics(AACContext *ac, SingleChannelElement *sce,
return AVERROR_INVALIDDATA;
}
}
if ((tns->present = get_bits1(gb)) && decode_tns(ac, tns, gb, ics))
return AVERROR_INVALIDDATA;
tns->present = get_bits1(gb);
if (tns->present && !er_syntax)
if (decode_tns(ac, tns, gb, ics) < 0)
return AVERROR_INVALIDDATA;
if (get_bits1(gb)) {
avpriv_request_sample(ac->avctx, "SSR");
return AVERROR_PATCHWELCOME;
}
// I see no textual basis in the spec for this occuring after SSR gain
// control, but this is what both reference and real implmentations do
if (tns->present && er_syntax)
if (decode_tns(ac, tns, gb, ics) < 0)
return AVERROR_INVALIDDATA;
}
if (decode_spectrum_and_dequant(ac, out, gb, sce->sf, pulse_present,
@ -2466,6 +2494,61 @@ static int parse_adts_frame_header(AACContext *ac, GetBitContext *gb)
return size;
}
static int aac_decode_er_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, GetBitContext *gb)
{
AACContext *ac = avctx->priv_data;
ChannelElement *che;
int err, i;
int samples = 1024;
int chan_config = ac->oc[1].m4ac.chan_config;
ac->frame = data;
if ((err = frame_configure_elements(avctx)) < 0)
return err;
ac->tags_mapped = 0;
if (chan_config < 0 || chan_config >= 8) {
avpriv_request_sample(avctx, "Unknown ER channel configuration %d",
ac->oc[1].m4ac.chan_config);
return AVERROR_INVALIDDATA;
}
for (i = 0; i < tags_per_config[chan_config]; i++) {
const int elem_type = aac_channel_layout_map[chan_config-1][i][0];
const int elem_id = aac_channel_layout_map[chan_config-1][i][1];
if (!(che=get_che(ac, elem_type, elem_id))) {
av_log(ac->avctx, AV_LOG_ERROR,
"channel element %d.%d is not allocated\n",
elem_type, elem_id);
return AVERROR_INVALIDDATA;
}
skip_bits(gb, 4);
switch (elem_type) {
case TYPE_SCE:
err = decode_ics(ac, &che->ch[0], gb, 0, 0);
break;
case TYPE_CPE:
err = decode_cpe(ac, gb, che);
break;
case TYPE_LFE:
err = decode_ics(ac, &che->ch[0], gb, 0, 0);
break;
}
if (err < 0)
return err;
}
spectral_to_sample(ac);
ac->frame->nb_samples = samples;
*got_frame_ptr = 1;
skip_bits_long(gb, get_bits_left(gb));
return 0;
}
static int aac_decode_frame_int(AVCodecContext *avctx, void *data,
int *got_frame_ptr, GetBitContext *gb)
{
@ -2639,7 +2722,16 @@ static int aac_decode_frame(AVCodecContext *avctx, void *data,
if ((err = init_get_bits(&gb, buf, buf_size * 8)) < 0)
return err;
if ((err = aac_decode_frame_int(avctx, data, got_frame_ptr, &gb)) < 0)
switch (ac->oc[1].m4ac.object_type) {
case AOT_ER_AAC_LC:
case AOT_ER_AAC_LTP:
case AOT_ER_AAC_LD:
err = aac_decode_er_frame(avctx, data, got_frame_ptr, &gb);
break;
default:
err = aac_decode_frame_int(avctx, data, got_frame_ptr, &gb);
}
if (err < 0)
return err;
buf_consumed = (get_bits_count(&gb) + 7) >> 3;

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