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aacsbr: Add a debug check to sbr_mapping.

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There have been multiple bugs caused by inconsistencies here.

Based on an idea from Michael Niedermayer.

CC: libav-stable@libav.org
This commit is contained in:
Alex Converse 2012-03-21 12:20:58 -07:00
parent 0cb93dacee
commit b00307ecd0
1 changed files with 17 additions and 7 deletions
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14
libavcodec/aacsbr.c
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@ -1399,7 +1399,7 @@ static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
/** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
* (14496-3 sp04 p217)
*/
static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
SBRData *ch_data, int e_a[2])
{
int e, i, m;
@ -1410,6 +1410,12 @@ static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
int k;
if (sbr->kx[1] != table[0]) {
av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "
"Derived frequency tables were not regenerated.\n");
sbr_turnoff(sbr);
return AVERROR_BUG;
}
for (i = 0; i < ilim; i++)
for (m = table[i]; m < table[i + 1]; m++)
sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
@ -1444,6 +1450,7 @@ static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
}
memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
return 0;
}
/// Estimation of current envelope (14496-3 sp04 p218)
@ -1644,6 +1651,7 @@ void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate;
int ch;
int nch = (id_aac == TYPE_CPE) ? 2 : 1;
int err;
if (!sbr->kx_and_m_pushed) {
sbr->kx[0] = sbr->kx[1];
@ -1670,13 +1678,15 @@ void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
sbr->data[ch].bs_num_env);
// hf_adj
sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
if (!err) {
sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
sbr->X_high, sbr, &sbr->data[ch],
sbr->data[ch].e_a);
}
}
/* synthesis */
sbr_x_gen(sbr, sbr->X[ch],