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resample: implement flushing

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This commit is contained in:
Anton Khirnov 2014-03-04 22:38:47 +01:00
parent 801c39e1e3
commit f7c5fd8151
2 changed files with 40 additions and 8 deletions
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46
libavresample/resample.c
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@ -52,6 +52,8 @@ struct ResampleContext {
int padding_size;
int initial_padding_filled;
int initial_padding_samples;
int final_padding_filled;
int final_padding_samples;
};
@ -433,27 +435,57 @@ int ff_audio_resample(ResampleContext *c, AudioData *dst, AudioData *src)
ret = ff_audio_data_combine(c->buffer, in_leftover, src, 0, in_samples);
if (ret < 0)
return ret;
} else if (!in_leftover) {
} else if (in_leftover <= c->final_padding_samples) {
/* no remaining samples to flush */
return 0;
} else {
/* TODO: pad buffer to flush completely */
}
if (!c->initial_padding_filled) {
int bps = av_get_bytes_per_sample(c->avr->internal_sample_fmt);
int i;
if (c->buffer->nb_samples < 2 * c->padding_size)
if (src && c->buffer->nb_samples < 2 * c->padding_size)
return 0;
for (i = 0; i < c->padding_size; i++)
for (ch = 0; ch < c->buffer->channels; ch++)
memcpy(c->buffer->data[ch] + bps * i,
c->buffer->data[ch] + bps * (2 * c->padding_size - i), bps);
for (ch = 0; ch < c->buffer->channels; ch++) {
if (c->buffer->nb_samples > 2 * c->padding_size - i) {
memcpy(c->buffer->data[ch] + bps * i,
c->buffer->data[ch] + bps * (2 * c->padding_size - i), bps);
} else {
memset(c->buffer->data[ch] + bps * i, 0, bps);
}
}
c->initial_padding_filled = 1;
}
if (!src && !c->final_padding_filled) {
int bps = av_get_bytes_per_sample(c->avr->internal_sample_fmt);
int i;
ret = ff_audio_data_realloc(c->buffer, in_samples + c->padding_size);
if (ret < 0) {
av_log(c->avr, AV_LOG_ERROR, "Error reallocating resampling buffer\n");
return AVERROR(ENOMEM);
}
for (i = 0; i < c->padding_size; i++)
for (ch = 0; ch < c->buffer->channels; ch++) {
if (in_leftover > i) {
memcpy(c->buffer->data[ch] + bps * (in_leftover + i),
c->buffer->data[ch] + bps * (in_leftover - i - 1),
bps);
} else {
memset(c->buffer->data[ch] + bps * (in_leftover + i),
0, bps);
}
}
c->buffer->nb_samples += c->padding_size;
c->final_padding_samples = c->padding_size;
c->final_padding_filled = 1;
}
/* calculate output size and reallocate output buffer if needed */
/* TODO: try to calculate this without the dummy resample() run */
if (!dst->read_only && dst->allow_realloc) {

2
tests/fate/libavresample.mak
View File

@ -38,7 +38,7 @@ fate-lavr-resample-$(3)-$(1)-$(2): CMD = avconv -i $(TARGET_PATH)/tests/data/asy
fate-lavr-resample-$(3)-$(1)-$(2): CMP = oneoff
fate-lavr-resample-$(3)-$(1)-$(2): CMP_UNIT = $(5)
fate-lavr-resample-$(3)-$(1)-$(2): FUZZ = 6
fate-lavr-resample-$(3)-$(1)-$(2): REF = $(SAMPLES)/lavr/lavr-resample-$(3)-$(1)-$(2)
fate-lavr-resample-$(3)-$(1)-$(2): REF = $(SAMPLES)/lavr/lavr-resample-$(3)-$(1)-$(2)-v2
endef
$(call CROSS_TEST,$(SAMPLERATES),RESAMPLE,s16p,s16le,s16)