static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr) { WMACodecContext *s = avctx->priv_data; int i, total_gain, ret, error; s->block_len_bits= s->frame_len_bits; //required by non variable block len s->block_len = 1 << s->block_len_bits; apply_window_and_mdct(avctx, frame); if (s->ms_stereo) { float a, b; int i; for(i = 0; i < s->block_len; i++) { a = s->coefs[0][i]*0.5; b = s->coefs[1][i]*0.5; s->coefs[0][i] = a + b; s->coefs[1][i] = a - b; } } if ((ret = ff_alloc_packet2(avctx, avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE))) return ret; total_gain= 128; for(i=64; i; i>>=1){ error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain - i); if(error<=0) total_gain-= i; } while(total_gain <= 128 && error > 0) error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain++); av_assert0((put_bits_count(&s->pb) & 7) == 0); i= avctx->block_align - (put_bits_count(&s->pb)+7)/8; av_assert0(i>=0); while(i--) put_bits(&s->pb, 8, 'N'); flush_put_bits(&s->pb); av_assert0(put_bits_ptr(&s->pb) - s->pb.buf == avctx->block_align); if (frame->pts != AV_NOPTS_VALUE) avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->delay); avpkt->size = avctx->block_align; *got_packet_ptr = 1; return 0; }