static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter, AVFilterInOut *in) { AVFilterContext *last_filter; const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer"); InputStream *ist = ifilter->ist; InputFile *f = input_files[ist->file_index]; char args[255], name[255]; int ret, pad_idx = 0; snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s" ":channel_layout=0x%"PRIx64, 1, ist->st->codec->sample_rate, ist->st->codec->sample_rate, av_get_sample_fmt_name(ist->st->codec->sample_fmt), ist->st->codec->channel_layout); snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index, ist->file_index, ist->st->index); if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt, name, args, NULL, fg->graph)) < 0) return ret; last_filter = ifilter->filter; if (audio_sync_method > 0) { AVFilterContext *async; int len = 0; av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the " "asyncts audio filter instead.\n"); if (audio_sync_method > 1) len += snprintf(args + len, sizeof(args) - len, "compensate=1:" "max_comp=%d:", audio_sync_method); snprintf(args + len, sizeof(args) - len, "min_delta=%f", audio_drift_threshold); snprintf(name, sizeof(name), "graph %d audio sync for input stream %d:%d", fg->index, ist->file_index, ist->st->index); ret = avfilter_graph_create_filter(&async, avfilter_get_by_name("asyncts"), name, args, NULL, fg->graph); if (ret < 0) return ret; ret = avfilter_link(last_filter, 0, async, 0); if (ret < 0) return ret; last_filter = async; } if (audio_volume != 256) { AVFilterContext *volume; av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume " "audio filter instead.\n"); snprintf(args, sizeof(args), "volume=%f", audio_volume / 256.0); snprintf(name, sizeof(name), "graph %d volume for input stream %d:%d", fg->index, ist->file_index, ist->st->index); ret = avfilter_graph_create_filter(&volume, avfilter_get_by_name("volume"), name, args, NULL, fg->graph); if (ret < 0) return ret; ret = avfilter_link(last_filter, 0, volume, 0); if (ret < 0) return ret; last_filter = volume; } snprintf(name, sizeof(name), "trim for input stream %d:%d", ist->file_index, ist->st->index); ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ? AV_NOPTS_VALUE : 0, INT64_MAX, &last_filter, &pad_idx, name); if (ret < 0) return ret; if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0) return ret; return 0; }