static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
{
OutputStream *ost = ofilter->ost;
OutputFile *of = output_files[ost->file_index];
AVCodecContext *codec = ost->enc_ctx;
AVFilterContext *last_filter = out->filter_ctx;
int pad_idx = out->pad_idx;
char *sample_fmts, *sample_rates, *channel_layouts;
char name[255];
int ret;
snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
ret = avfilter_graph_create_filter(&ofilter->filter,
avfilter_get_by_name("abuffersink"),
name, NULL, NULL, fg->graph);
if (ret < 0)
return ret;
if (codec->channels && !codec->channel_layout)
codec->channel_layout = av_get_default_channel_layout(codec->channels);
sample_fmts = choose_sample_fmts(ost);
sample_rates = choose_sample_rates(ost);
channel_layouts = choose_channel_layouts(ost);
if (sample_fmts || sample_rates || channel_layouts) {
AVFilterContext *format;
char args[256];
int len = 0;
if (sample_fmts)
len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
sample_fmts);
if (sample_rates)
len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
sample_rates);
if (channel_layouts)
len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
channel_layouts);
args[len - 1] = 0;
av_freep(&sample_fmts);
av_freep(&sample_rates);
av_freep(&channel_layouts);
snprintf(name, sizeof(name), "audio format for output stream %d:%d",
ost->file_index, ost->index);
ret = avfilter_graph_create_filter(&format,
avfilter_get_by_name("aformat"),
name, args, NULL, fg->graph);
if (ret < 0)
return ret;
ret = avfilter_link(last_filter, pad_idx, format, 0);
if (ret < 0)
return ret;
last_filter = format;
pad_idx = 0;
}
snprintf(name, sizeof(name), "trim for output stream %d:%d",
ost->file_index, ost->index);
ret = insert_trim(of->start_time, of->recording_time,
&last_filter, &pad_idx, name);
if (ret < 0)
return ret;
if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
return ret;
return 0;
}
static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
{
OutputStream *ost = ofilter->ost;
OutputFile *of = output_files[ost->file_index];
AVCodecContext *codec = ost->enc_ctx;
AVFilterContext *last_filter = out->filter_ctx;
int pad_idx = out->pad_idx;
char *sample_fmts, *sample_rates, *channel_layouts;
char name[255];
int ret;
snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
ret = avfilter_graph_create_filter(&ofilter->filter,
avfilter_get_by_name("abuffersink"),
name, NULL, NULL, fg->graph);
if (ret < 0)
return ret;
if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
return ret;
#define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do { \
AVFilterContext *filt_ctx; \
\
av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
"similarly to -af " filter_name "=%s.\n", arg); \
\
ret = avfilter_graph_create_filter(&filt_ctx, \
avfilter_get_by_name(filter_name), \
filter_name, arg, NULL, fg->graph); \
if (ret < 0) \
return ret; \
\
ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0); \
if (ret < 0) \
return ret; \
\
last_filter = filt_ctx; \
pad_idx = 0; \
} while (0)
if (ost->audio_channels_mapped) {
int i;
AVBPrint pan_buf;
av_bprint_init(&pan_buf, 256, 8192);
av_bprintf(&pan_buf, "0x%"PRIx64,
av_get_default_channel_layout(ost->audio_channels_mapped));
for (i = 0; i < ost->audio_channels_mapped; i++)
if (ost->audio_channels_map[i] != -1)
av_bprintf(&pan_buf, "|c%d=c%d", i, ost->audio_channels_map[i]);
AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
av_bprint_finalize(&pan_buf, NULL);
}
if (codec->channels && !codec->channel_layout)
codec->channel_layout = av_get_default_channel_layout(codec->channels);
sample_fmts = choose_sample_fmts(ost);
sample_rates = choose_sample_rates(ost);
channel_layouts = choose_channel_layouts(ost);
if (sample_fmts || sample_rates || channel_layouts) {
AVFilterContext *format;
char args[256];
args[0] = 0;
if (sample_fmts)
av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
sample_fmts);
if (sample_rates)
av_strlcatf(args, sizeof(args), "sample_rates=%s:",
sample_rates);
if (channel_layouts)
av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
channel_layouts);
av_freep(&sample_fmts);
av_freep(&sample_rates);
av_freep(&channel_layouts);
snprintf(name, sizeof(name), "audio format for output stream %d:%d",
ost->file_index, ost->index);
ret = avfilter_graph_create_filter(&format,
avfilter_get_by_name("aformat"),
name, args, NULL, fg->graph);
if (ret < 0)
return ret;
ret = avfilter_link(last_filter, pad_idx, format, 0);
if (ret < 0)
return ret;
last_filter = format;
pad_idx = 0;
}
if (audio_volume != 256 && 0) {
char args[256];
snprintf(args, sizeof(args), "%f", audio_volume / 256.);
AUTO_INSERT_FILTER("-vol", "volume", args);
}
if (ost->apad && of->shortest) {
char args[256];
int i;
for (i=0; i<of->ctx->nb_streams; i++)
if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
break;
if (i<of->ctx->nb_streams) {
snprintf(args, sizeof(args), "%s", ost->apad);
AUTO_INSERT_FILTER("-apad", "apad", args);
}
}
snprintf(name, sizeof(name), "trim for output stream %d:%d",
ost->file_index, ost->index);
ret = insert_trim(of->start_time, of->recording_time,
&last_filter, &pad_idx, name);
if (ret < 0)
return ret;
if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
return ret;
return 0;
}
