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vda: Reuse the bitstream buffer and reallocate it only if needed

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Signed-off-by: Diego Biurrun <diego@biurrun.de>
This commit is contained in:
Sebastien Zwickert 2012-08-13 20:17:45 +02:00 committed by Diego Biurrun
parent ad08dfd594
commit cfc680ab39
3 changed files with 28 additions and 26 deletions
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2
libavcodec/vda.c
View File

@ -226,6 +226,8 @@ int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
pthread_mutex_destroy(&vda_ctx->queue_mutex);
av_freep(&vda_ctx->priv_bitstream);
if (kVDADecoderNoErr != status)
return status;

15
libavcodec/vda.h
View File

@ -138,6 +138,21 @@ struct vda_context {
* - decoding: Set/Unset by user.
*/
OSType cv_pix_fmt_type;
/**
* The current bitstream buffer.
*/
uint8_t *priv_bitstream;
/**
* The current size of the bitstream.
*/
int priv_bitstream_size;
/**
* The reference size used for fast reallocation.
*/
int priv_allocated_size;
};
/** Create the video decoder. */

37
libavcodec/vda_h264.c
View File

@ -21,29 +21,18 @@
*/
#include "h264.h"
#include "h264data.h"
#include "vda_internal.h"
/* This structure is used to store the bitstream of the current frame. */
struct vda_picture_context {
uint8_t *bitstream;
int bitstream_size;
};
static int start_frame(AVCodecContext *avctx,
av_unused const uint8_t *buffer,
av_unused uint32_t size)
{
const H264Context *h = avctx->priv_data;
struct vda_context *vda_ctx = avctx->hwaccel_context;
struct vda_picture_context *pic_ctx = h->s.current_picture_ptr->f.hwaccel_picture_private;
if (!vda_ctx->decoder)
return -1;
pic_ctx->bitstream = NULL;
pic_ctx->bitstream_size = 0;
vda_ctx->priv_bitstream_size = 0;
return 0;
}
@ -52,24 +41,24 @@ static int decode_slice(AVCodecContext *avctx,
const uint8_t *buffer,
uint32_t size)
{
H264Context *h = avctx->priv_data;
struct vda_context *vda_ctx = avctx->hwaccel_context;
struct vda_picture_context *pic_ctx = h->s.current_picture_ptr->f.hwaccel_picture_private;
void *tmp;
if (!vda_ctx->decoder)
return -1;
tmp = av_realloc(pic_ctx->bitstream, pic_ctx->bitstream_size+size+4);
tmp = av_fast_realloc(vda_ctx->priv_bitstream,
&vda_ctx->priv_allocated_size,
vda_ctx->priv_bitstream_size + size + 4);
if (!tmp)
return AVERROR(ENOMEM);
pic_ctx->bitstream = tmp;
vda_ctx->priv_bitstream = tmp;
AV_WB32(pic_ctx->bitstream + pic_ctx->bitstream_size, size);
memcpy(pic_ctx->bitstream + pic_ctx->bitstream_size + 4, buffer, size);
AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size);
memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size);
pic_ctx->bitstream_size += size + 4;
vda_ctx->priv_bitstream_size += size + 4;
return 0;
}
@ -78,22 +67,19 @@ static int end_frame(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
struct vda_context *vda_ctx = avctx->hwaccel_context;
struct vda_picture_context *pic_ctx = h->s.current_picture_ptr->f.hwaccel_picture_private;
AVFrame *frame = &h->s.current_picture_ptr->f;
int status;
if (!vda_ctx->decoder || !pic_ctx->bitstream)
if (!vda_ctx->decoder || !vda_ctx->priv_bitstream)
return -1;
status = ff_vda_decoder_decode(vda_ctx, pic_ctx->bitstream,
pic_ctx->bitstream_size,
status = ff_vda_decoder_decode(vda_ctx, vda_ctx->priv_bitstream,
vda_ctx->priv_bitstream_size,
frame->reordered_opaque);
if (status)
av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
av_freep(&pic_ctx->bitstream);
return status;
}
@ -105,5 +91,4 @@ AVHWAccel ff_h264_vda_hwaccel = {
.start_frame = start_frame,
.decode_slice = decode_slice,
.end_frame = end_frame,
.priv_data_size = sizeof(struct vda_picture_context),
};