#include <math.h>
+#include "libavutil/channel_layout.h"
#include "libavutil/mem.h"
#include "dsputil.h"
#include "avcodec.h"
2 * (s->block_conv_table[1] - 2 * s->min_pitch_val);
s->block_pitch_nbits = av_ceil_log2(s->block_pitch_range);
+ ctx->channels = 1;
+ ctx->channel_layout = AV_CH_LAYOUT_MONO;
ctx->sample_fmt = AV_SAMPLE_FMT_FLT;
avcodec_get_frame_defaults(&s->frame);