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audio: add mp_audio_make_writeable()

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wm4 2014-11-10 20:52:30 +01:00
parent c1b034f2aa
commit 46d6fb9dc1
2 changed files with 28 additions and 0 deletions
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26
audio/audio.c
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@ -244,6 +244,32 @@ void mp_audio_skip_samples(struct mp_audio *data, int samples)
data->samples -= samples;
}
// Make sure the frame owns the audio data, and if not, copy the data.
// Return negative value on failure (which means it can't be made writeable).
// Non-refcounted frames are always considered writeable.
int mp_audio_make_writeable(struct mp_audio *data)
{
bool ok = true;
for (int n = 0; n < MP_NUM_CHANNELS; n++) {
if (data->allocated[n])
ok &= av_buffer_is_writable(data->allocated[n]);
}
if (!ok) {
struct mp_audio *new = talloc(NULL, struct mp_audio);
*new = *data;
mp_audio_set_null_data(new); // use format only
mp_audio_realloc(new, data->samples);
new->samples = data->samples;
mp_audio_copy(new, 0, data, 0, data->samples);
// "Transfer" the reference.
mp_audio_destructor(data);
*data = *new;
talloc_set_destructor(new, NULL);
talloc_free(new);
}
return 0;
}
struct mp_audio *mp_audio_from_avframe(struct AVFrame *avframe)
{
struct mp_audio *new = talloc_zero(NULL, struct mp_audio);

2
audio/audio.h
View File

@ -68,6 +68,8 @@ void mp_audio_copy(struct mp_audio *dst, int dst_offset,
struct mp_audio *src, int src_offset, int length);
void mp_audio_skip_samples(struct mp_audio *data, int samples);
int mp_audio_make_writeable(struct mp_audio *data);
struct AVFrame;
struct mp_audio *mp_audio_from_avframe(struct AVFrame *avframe);