static int vorbis_encode_frame(AVCodecContext *avccontext, unsigned char *packets, int buf_size, void *data) { vorbis_enc_context *venc = avccontext->priv_data; const signed short *audio = data; int samples = data ? avccontext->frame_size : 0; vorbis_enc_mode *mode; vorbis_enc_mapping *mapping; PutBitContext pb; int i; if (!apply_window_and_mdct(venc, audio, samples)) return 0; samples = 1 << (venc->log2_blocksize[0] - 1); init_put_bits(&pb, packets, buf_size); put_bits(&pb, 1, 0); // magic bit put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode mode = &venc->modes[0]; mapping = &venc->mappings[mode->mapping]; if (mode->blockflag) { put_bits(&pb, 1, 0); put_bits(&pb, 1, 0); } for (i = 0; i < venc->channels; i++) { vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]]; uint16_t posts[MAX_FLOOR_VALUES]; floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples); floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples); } for (i = 0; i < venc->channels * samples; i++) venc->coeffs[i] /= venc->floor[i]; 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 a = ang[j]; ang[j] -= mag[j]; if (mag[j] > 0) ang[j] = -ang[j]; if (ang[j] < 0) mag[j] = a; } } residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]], &pb, venc->coeffs, samples, venc->channels); avccontext->coded_frame->pts = venc->sample_count; venc->sample_count += avccontext->frame_size; flush_put_bits(&pb); return put_bits_count(&pb) >> 3; }