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audio: use AVBufferRef to allocate audio frames

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A first step towards refcounted audio frames.

Amazingly, the API just does what we want, and the code becomes
simpler. We will need to NIH allocation from a pool, though.
This commit is contained in:
wm4 2014-11-10 10:43:15 +01:00
parent 5f175b0bdc
commit 9388f69f67
2 changed files with 10 additions and 20 deletions
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28
audio/audio.c
View File

@ -20,7 +20,7 @@
#include <stdlib.h>
#include <assert.h>
#include <libavutil/mem.h>
#include <libavutil/buffer.h>
#include "talloc.h"
#include "common/common.h"
@ -124,11 +124,8 @@ void mp_audio_set_null_data(struct mp_audio *mpa)
static void mp_audio_destructor(void *ptr)
{
struct mp_audio *mpa = ptr;
for (int n = 0; n < MP_NUM_CHANNELS; n++) {
// Note: don't free if not allocated by mp_audio_realloc
if (mpa->allocated[n])
av_free(mpa->planes[n]);
}
for (int n = 0; n < MP_NUM_CHANNELS; n++)
av_buffer_unref(&mpa->allocated[n]);
}
/* Reallocate the data stored in mpa->planes[n] so that enough samples are
@ -152,22 +149,15 @@ void mp_audio_realloc(struct mp_audio *mpa, int samples)
abort(); // oom
int size = MPMAX(samples * mpa->sstride, 1);
for (int n = 0; n < mpa->num_planes; n++) {
if (size != mpa->allocated[n]) {
// Note: av_realloc() can't be used (see libavutil doxygen)
void *new = av_malloc(size);
if (!new)
abort();
if (mpa->allocated[n])
memcpy(new, mpa->planes[n], MPMIN(mpa->allocated[n], size));
av_free(mpa->planes[n]);
mpa->planes[n] = new;
mpa->allocated[n] = size;
if (!mpa->allocated[n] || size != mpa->allocated[n]->size) {
if (av_buffer_realloc(&mpa->allocated[n], size) < 0)
abort(); // OOM
mpa->planes[n] = mpa->allocated[n]->data;
}
}
for (int n = mpa->num_planes; n < MP_NUM_CHANNELS; n++) {
av_free(mpa->planes[n]);
av_buffer_unref(&mpa->allocated[n]);
mpa->planes[n] = NULL;
mpa->allocated[n] = 0;
}
talloc_set_destructor(mpa, mp_audio_destructor);
}
@ -194,7 +184,7 @@ int mp_audio_get_allocated_size(struct mp_audio *mpa)
{
int size = 0;
for (int n = 0; n < mpa->num_planes; n++) {
int s = mpa->allocated[n] / mpa->sstride;
int s = mpa->allocated[n] ? mpa->allocated[n]->size / mpa->sstride : 0;
size = n == 0 ? s : MPMIN(size, s);
}
return size;

2
audio/audio.h
View File

@ -38,7 +38,7 @@ struct mp_audio {
int bps; // size of sub-samples (af_fmt2bps(format))
// private
int allocated[MP_NUM_CHANNELS]; // use mp_audio_get_allocated_size()
struct AVBufferRef *allocated[MP_NUM_CHANNELS];
};
void mp_audio_set_format(struct mp_audio *mpa, int format);