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Original Commit: r70 | ods15 | 2006-09-28 19:07:36 +0300 (Thu, 28 Sep 2006) | 2 lines

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channel coupling

Originally committed as revision 6475 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Oded Shimon 2006-10-02 06:08:09 +00:00
parent 90a09b69d7
commit 9d74ff0e55
1 changed files with 38 additions and 1 deletions
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39
libavcodec/vorbis_enc.c
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@ -92,6 +92,9 @@ typedef struct {
int * mux;
int * floor;
int * residue;
int coupling_steps;
int * magnitude;
int * angle;
} mapping_t;
typedef struct {
@ -389,6 +392,13 @@ static void create_vorbis_context(venc_context_t * venc, AVCodecContext * avccon
mc->floor[i] = 0;
mc->residue[i] = 0;
}
mc->coupling_steps = venc->channels == 2 ? 1 : 0;
mc->magnitude = av_malloc(sizeof(int) * mc->coupling_steps);
mc->angle = av_malloc(sizeof(int) * mc->coupling_steps);
if (mc->coupling_steps) {
mc->magnitude[0] = 0;
mc->angle[0] = 1;
}
venc->nmodes = 1;
venc->modes = av_malloc(sizeof(vorbis_mode_t) * venc->nmodes);
@ -602,7 +612,15 @@ static int put_main_header(venc_context_t * venc, uint8_t ** out) {
put_bits(&pb, 1, mc->submaps > 1);
if (mc->submaps > 1) put_bits(&pb, 4, mc->submaps - 1);
put_bits(&pb, 1, 0); // channel coupling
put_bits(&pb, 1, !!mc->coupling_steps);
if (mc->coupling_steps) {
put_bits(&pb, 8, mc->coupling_steps - 1);
for (j = 0; j < mc->coupling_steps; j++) {
av_log(NULL, AV_LOG_ERROR, "%d %d %d %d\n", venc->channels, ilog(venc->channels - 1), mc->magnitude[j], mc->angle[j]);
put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
}
}
put_bits(&pb, 2, 0); // reserved
@ -932,6 +950,25 @@ static int vorbis_encode_frame(AVCodecContext * avccontext, unsigned char * pack
}
}
for (i = 0; i < mapping->coupling_steps; i++) {
float * mag = venc->coeffs + mapping->magnitude[i] * samples;
float * ang = venc->coeffs + mapping->angle[i] * samples;
int j;
for (j = 0; j < samples; j++) {
float m = mag[j];
float a = ang[j];
if (m > 0) {
ang[j] = m - a;
if (a > m) mag[j] = a;
else mag[j] = m;
} else {
ang[j] = a - m;
if (a > m) mag[j] = m;
else mag[j] = a;
}
}
}
residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]], &pb, venc->coeffs, samples, venc->channels);
return (put_bits_count(&pb) + 7) / 8;