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now supports audio speeds outside of 0.5-2.0 when maintaining pitch

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This commit is contained in:
itsmattkc
2018-11-02 10:01:43 +11:00
parent a8c48e8c7e
commit e7505ac5b0
1 changed files with 28 additions and 6 deletions
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playback/cacher.cpp
+28 -6
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@@ -715,13 +715,35 @@ void open_clip_worker(Clip* clip) {
if (qFuzzyCompare(clip->speed, 1.0)) {
avfilter_link(clip->buffersrc_ctx, 0, clip->buffersink_ctx, 0);
} else if (clip->maintain_audio_pitch) {
char speed_param[10];
snprintf(speed_param, sizeof(speed_param), "%f", clip->speed);
AVFilterContext* previous_filter = clip->buffersrc_ctx;
AVFilterContext* last_filter = clip->buffersrc_ctx;
AVFilterContext* tempo_filter;
avfilter_graph_create_filter(&tempo_filter, avfilter_get_by_name("atempo"), "atempo", speed_param, NULL, clip->filter_graph);
avfilter_link(clip->buffersrc_ctx, 0, tempo_filter, 0);
avfilter_link(tempo_filter, 0, clip->buffersink_ctx, 0);
char speed_param[10];
if (clip->speed != 1.0) {
double base = (clip->speed > 1.0) ? 2.0 : 0.5;
double speedlog = log(clip->speed) / log(base);
int whole2 = qFloor(speedlog);
speedlog -= whole2;
if (whole2 > 0) {
snprintf(speed_param, sizeof(speed_param), "%f", base);
for (int i=0;i<whole2;i++) {
AVFilterContext* tempo_filter = NULL;
avfilter_graph_create_filter(&tempo_filter, avfilter_get_by_name("atempo"), "atempo", speed_param, NULL, clip->filter_graph);
avfilter_link(previous_filter, 0, tempo_filter, 0);
previous_filter = tempo_filter;
}
}
snprintf(speed_param, sizeof(speed_param), "%f", qPow(base, speedlog));
last_filter = NULL;
avfilter_graph_create_filter(&last_filter, avfilter_get_by_name("atempo"), "atempo", speed_param, NULL, clip->filter_graph);
avfilter_link(previous_filter, 0, last_filter, 0);
}
avfilter_link(last_filter, 0, clip->buffersink_ctx, 0);
} else {
target_sample_rate = qRound64(clip->sequence->audio_frequency / clip->speed);
avfilter_link(clip->buffersrc_ctx, 0, clip->buffersink_ctx, 0);