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lavfi/avf_showwaves: fix extra gaps at end of waveform 

Fixes #5931.
This commit is contained in:
Paul B Mahol 2019-04-21 21:06:25 +02:00
parent 833ae5f4bf
commit dafcdeb258
1 changed files with 8 additions and 4 deletions
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12
libavfilter/avf_showwaves.c
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@ -559,7 +559,9 @@ static int push_single_pic(AVFilterLink *outlink)
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
ShowWavesContext *showwaves = ctx->priv;
int64_t n = 0, max_samples = showwaves->total_samples / outlink->w;
int64_t n = 0, column_max_samples = showwaves->total_samples / outlink->w;
int64_t remaining_samples = showwaves->total_samples - (column_max_samples * outlink->w);
int64_t last_column_samples = column_max_samples + remaining_samples;
AVFrame *out = showwaves->outpicref;
struct frame_node *node;
const int nb_channels = inlink->channels;
@ -569,12 +571,12 @@ static int push_single_pic(AVFilterLink *outlink)
int col = 0;
int64_t *sum = showwaves->sum;
if (max_samples == 0) {
if (column_max_samples == 0) {
av_log(ctx, AV_LOG_ERROR, "Too few samples\n");
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_DEBUG, "Create frame averaging %"PRId64" samples per column\n", max_samples);
av_log(ctx, AV_LOG_DEBUG, "Create frame averaging %"PRId64" samples per column\n", column_max_samples);
memset(sum, 0, nb_channels);
@ -584,11 +586,13 @@ static int push_single_pic(AVFilterLink *outlink)
const int16_t *p = (const int16_t *)frame->data[0];
for (i = 0; i < frame->nb_samples; i++) {
int64_t max_samples = col == outlink->w - 1 ? last_column_samples: column_max_samples;
int ch;
for (ch = 0; ch < nb_channels; ch++)
sum[ch] += abs(p[ch + i*nb_channels]) << 1;
if (n++ == max_samples) {
n++;
if (n == max_samples) {
for (ch = 0; ch < nb_channels; ch++) {
int16_t sample = sum[ch] / max_samples;
uint8_t *buf = out->data[0] + col * pixstep;