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screenshot, vo_png: fix dependency on sizeof(AVFrame)

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In order to stay binary compatible with libavcodec, applications should
not dependent on sizeof(AVFrame). This means allocating AVFrame on the
stack is not allowed, and the function avcodec_alloc_frame() must be
used to allocate an AVFrame instead.

Partially based on a patch by uau.
This commit is contained in:
wm4 2012-04-29 07:32:57 +02:00
parent 97ac824124
commit 4add4f708e
2 changed files with 22 additions and 11 deletions
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15
libvo/vo_png.c
View File

@ -50,6 +50,7 @@ static int z_compression;
static int framenum;
static int use_alpha;
static AVCodecContext *avctx;
static AVFrame *pic;
static uint8_t *outbuffer;
int outbuffer_size;
@ -70,6 +71,9 @@ config(uint32_t width, uint32_t height, uint32_t d_width, uint32_t d_height, uin
avctx = avcodec_alloc_context3(png_codec);
if (!avctx)
goto error;
pic = avcodec_alloc_frame();
if (!pic)
goto error;
avctx->width = width;
avctx->height = height;
avctx->pix_fmt = imgfmt2pixfmt(format);
@ -85,7 +89,6 @@ config(uint32_t width, uint32_t height, uint32_t d_width, uint32_t d_height, uin
static uint32_t draw_image(mp_image_t* mpi){
AVFrame pic;
int buffersize;
int res;
char buf[100];
@ -101,15 +104,17 @@ static uint32_t draw_image(mp_image_t* mpi){
return 1;
}
pic.data[0] = mpi->planes[0];
pic.linesize[0] = mpi->stride[0];
avcodec_get_frame_defaults(pic);
pic->data[0] = mpi->planes[0];
pic->linesize[0] = mpi->stride[0];
buffersize = mpi->w * mpi->h * 8;
if (outbuffer_size < buffersize) {
av_freep(&outbuffer);
outbuffer = av_malloc(buffersize);
outbuffer_size = buffersize;
}
res = avcodec_encode_video(avctx, outbuffer, outbuffer_size, &pic);
res = avcodec_encode_video(avctx, outbuffer, outbuffer_size, pic);
if(res < 0){
mp_msg(MSGT_VO,MSGL_WARN, "[VO_PNG] Error in create_png.\n");
@ -156,6 +161,8 @@ static void uninit(void)
avcodec_close(avctx);
av_freep(&avctx);
av_freep(&outbuffer);
av_free(pic);
pic = NULL;
outbuffer_size = 0;
}

18
screenshot.c
View File

@ -23,8 +23,6 @@
#include <setjmp.h>
#include <time.h>
#include "osdep/io.h"
#include <libswscale/swscale.h>
#include <libavcodec/avcodec.h>
@ -34,6 +32,8 @@
#include <jpeglib.h>
#endif
#include "osdep/io.h"
#include "talloc.h"
#include "screenshot.h"
#include "mp_core.h"
@ -82,6 +82,7 @@ static int write_png(screenshot_ctx *ctx, struct mp_image *image, FILE *fp)
{
void *outbuffer = NULL;
int success = 0;
AVFrame *pic = NULL;
struct AVCodec *png_codec = avcodec_find_encoder(CODEC_ID_PNG);
AVCodecContext *avctx = NULL;
@ -109,13 +110,15 @@ static int write_png(screenshot_ctx *ctx, struct mp_image *image, FILE *fp)
if (!outbuffer)
goto error_exit;
AVFrame pic;
avcodec_get_frame_defaults(&pic);
pic = avcodec_alloc_frame();
if (!pic)
goto error_exit;
avcodec_get_frame_defaults(pic);
for (int n = 0; n < 4; n++) {
pic.data[n] = image->planes[n];
pic.linesize[n] = image->stride[n];
pic->data[n] = image->planes[n];
pic->linesize[n] = image->stride[n];
}
int size = avcodec_encode_video(avctx, outbuffer, outbuffer_size, &pic);
int size = avcodec_encode_video(avctx, outbuffer, outbuffer_size, pic);
if (size < 1)
goto error_exit;
@ -126,6 +129,7 @@ error_exit:
if (avctx)
avcodec_close(avctx);
av_free(avctx);
av_free(pic);
free(outbuffer);
return success;
}