int swr_init(struct SwrContext *s){ s->in_buffer_index= 0; s->in_buffer_count= 0; s->resample_in_constraint= 0; free_temp(&s->postin); free_temp(&s->midbuf); free_temp(&s->preout); free_temp(&s->in_buffer); swri_audio_convert_free(&s-> in_convert); swri_audio_convert_free(&s->out_convert); swri_audio_convert_free(&s->full_convert); s-> in.planar= av_sample_fmt_is_planar(s-> in_sample_fmt); s->out.planar= av_sample_fmt_is_planar(s->out_sample_fmt); s-> in_sample_fmt= av_get_alt_sample_fmt(s-> in_sample_fmt, 0); s->out_sample_fmt= av_get_alt_sample_fmt(s->out_sample_fmt, 0); if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){ av_log(s, AV_LOG_ERROR, "Requested sample format %s is invalid\n", av_get_sample_fmt_name(s->in_sample_fmt)); return AVERROR(EINVAL); } if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){ av_log(s, AV_LOG_ERROR, "Requested sample format %s is invalid\n", av_get_sample_fmt_name(s->out_sample_fmt)); return AVERROR(EINVAL); } if( s->int_sample_fmt != AV_SAMPLE_FMT_S16 &&s->int_sample_fmt != AV_SAMPLE_FMT_FLT){ av_log(s, AV_LOG_ERROR, "Requested sample format %s is not supported internally, only float & S16 is supported\n", av_get_sample_fmt_name(s->int_sample_fmt)); return AVERROR(EINVAL); } //FIXME should we allow/support using FLT on material that doesnt need it ? if(s->in_sample_fmt <= AV_SAMPLE_FMT_S16 || s->int_sample_fmt==AV_SAMPLE_FMT_S16){ s->int_sample_fmt= AV_SAMPLE_FMT_S16; }else s->int_sample_fmt= AV_SAMPLE_FMT_FLT; if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){ s->resample = swri_resample_init(s->resample, s->out_sample_rate, s->in_sample_rate, 16, 10, 0, 0.8); }else swri_resample_free(&s->resample); if(s->int_sample_fmt != AV_SAMPLE_FMT_S16 && s->resample){ av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16 currently\n"); //FIXME return -1; } if(!s->used_ch_count) s->used_ch_count= s->in.ch_count; if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){ av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n"); s-> in_ch_layout= 0; } if(!s-> in_ch_layout) s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count); if(!s->out_ch_layout) s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count); s->rematrix= s->out_ch_layout !=s->in_ch_layout || s->rematrix_volume!=1.0; #define RSC 1 //FIXME finetune if(!s-> in.ch_count) s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout); if(!s->used_ch_count) s->used_ch_count= s->in.ch_count; if(!s->out.ch_count) s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout); av_assert0(s-> in.ch_count); av_assert0(s->used_ch_count); av_assert0(s->out.ch_count); s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0; s-> in.bps= av_get_bytes_per_sample(s-> in_sample_fmt); s->int_bps= av_get_bytes_per_sample(s->int_sample_fmt); s->out.bps= av_get_bytes_per_sample(s->out_sample_fmt); if(!s->resample && !s->rematrix && !s->channel_map){ s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt, s-> in_sample_fmt, s-> in.ch_count, NULL, 0); return 0; } s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt, s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0); s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt, s->int_sample_fmt, s->out.ch_count, NULL, 0); s->postin= s->in; s->preout= s->out; s->midbuf= s->in; s->in_buffer= s->in; if(s->channel_map){ s->postin.ch_count= s->midbuf.ch_count= s->in_buffer.ch_count= s->used_ch_count; } if(!s->resample_first){ s->midbuf.ch_count= s->out.ch_count; s->in_buffer.ch_count = s->out.ch_count; } s->in_buffer.bps = s->postin.bps = s->midbuf.bps = s->preout.bps = s->int_bps; s->in_buffer.planar = s->postin.planar = s->midbuf.planar = s->preout.planar = 1; if(s->rematrix) return swri_rematrix_init(s); return 0; }