mirror of https://git.ffmpeg.org/ffmpeg.git
Corrections to channel coupling code to attain conformance for appropriate
streams. Slightly reworked from a patch by Alex Converse (alex converse gmail com) Originally committed as revision 15573 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -967,7 +967,7 @@ static int decode_cce(AACContext * ac, GetBitContext * gb, ChannelElement * che)
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if (coup->ch_select[c] == 3)
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num_gain++;
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} else
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coup->ch_select[c] = 1;
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coup->ch_select[c] = 2;
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}
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coup->coupling_point += get_bits1(gb);
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@ -992,7 +992,7 @@ static int decode_cce(AACContext * ac, GetBitContext * gb, ChannelElement * che)
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if (c) {
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cge = coup->coupling_point == AFTER_IMDCT ? 1 : get_bits1(gb);
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gain = cge ? get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60: 0;
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gain_cache = pow(scale, gain);
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gain_cache = pow(scale, -gain);
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}
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for (g = 0; g < sce->ics.num_window_groups; g++) {
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for (sfb = 0; sfb < sce->ics.max_sfb; sfb++, idx++) {
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@ -1001,12 +1001,12 @@ static int decode_cce(AACContext * ac, GetBitContext * gb, ChannelElement * che)
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int t = get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
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if (t) {
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int s = 1;
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t = gain += t;
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if (sign) {
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s -= 2 * (t & 0x1);
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t >>= 1;
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}
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gain += t;
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gain_cache = pow(scale, gain) * s;
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gain_cache = pow(scale, -t) * s;
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}
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}
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coup->gain[c][idx] = gain_cache;
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@ -1292,25 +1292,30 @@ static void apply_independent_coupling(AACContext * ac, SingleChannelElement * s
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* @param apply_coupling_method pointer to (in)dependent coupling function
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*/
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static void apply_channel_coupling(AACContext * ac, ChannelElement * cc,
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enum RawDataBlockType type, int elem_id, enum CouplingPoint coupling_point,
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void (*apply_coupling_method)(AACContext * ac, SingleChannelElement * sce, ChannelElement * cc, int index))
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{
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int c;
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int i, c;
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for (i = 0; i < MAX_ELEM_ID; i++) {
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ChannelElement *cce = ac->che[TYPE_CCE][i];
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int index = 0;
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ChannelCoupling * coup = &cc->coup;
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if (cce && cce->coup.coupling_point == coupling_point) {
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ChannelCoupling * coup = &cce->coup;
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for (c = 0; c <= coup->num_coupled; c++) {
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if (ac->che[coup->type[c]][coup->id_select[c]]) {
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if (coup->ch_select[c] != 2) {
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apply_coupling_method(ac, &ac->che[coup->type[c]][coup->id_select[c]]->ch[0], cc, index);
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if (coup->type[c] == type && coup->id_select[c] == elem_id) {
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if (coup->ch_select[c] != 1) {
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apply_coupling_method(ac, &cc->ch[0], cce, index);
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if (coup->ch_select[c] != 0)
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index++;
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}
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if (coup->ch_select[c] != 1)
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apply_coupling_method(ac, &ac->che[coup->type[c]][coup->id_select[c]]->ch[1], cc, index++);
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} else {
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av_log(ac->avccontext, AV_LOG_ERROR,
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"coupling target %sE[%d] not available\n",
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coup->type[c] == TYPE_CPE ? "CP" : "SC", coup->id_select[c]);
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break;
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if (coup->ch_select[c] != 2)
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apply_coupling_method(ac, &cc->ch[1], cce, index++);
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} else
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index += 1 + (coup->ch_select[c] == 3);
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}
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}
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}
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}
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@ -1320,23 +1325,24 @@ static void apply_channel_coupling(AACContext * ac, ChannelElement * cc,
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*/
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static void spectral_to_sample(AACContext * ac) {
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int i, type;
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for(type = 3; type >= 0; type--) {
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for (i = 0; i < MAX_ELEM_ID; i++) {
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for(type = 0; type < 4; type++) {
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ChannelElement *che = ac->che[type][i];
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if(che) {
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if(che->coup.coupling_point == BEFORE_TNS)
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apply_channel_coupling(ac, che, apply_dependent_coupling);
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if(type <= TYPE_CPE)
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apply_channel_coupling(ac, che, type, i, BEFORE_TNS, apply_dependent_coupling);
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if(che->ch[0].tns.present)
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apply_tns(che->ch[0].coeffs, &che->ch[0].tns, &che->ch[0].ics, 1);
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if(che->ch[1].tns.present)
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apply_tns(che->ch[1].coeffs, &che->ch[1].tns, &che->ch[1].ics, 1);
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if(che->coup.coupling_point == BETWEEN_TNS_AND_IMDCT)
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apply_channel_coupling(ac, che, apply_dependent_coupling);
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if(type <= TYPE_CPE)
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apply_channel_coupling(ac, che, type, i, BETWEEN_TNS_AND_IMDCT, apply_dependent_coupling);
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if(type != TYPE_CCE || che->coup.coupling_point == AFTER_IMDCT)
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imdct_and_windowing(ac, &che->ch[0]);
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if(type == TYPE_CPE)
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imdct_and_windowing(ac, &che->ch[1]);
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if(che->coup.coupling_point == AFTER_IMDCT)
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apply_channel_coupling(ac, che, apply_independent_coupling);
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if(type <= TYPE_CCE)
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apply_channel_coupling(ac, che, type, i, AFTER_IMDCT, apply_independent_coupling);
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}
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}
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}
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