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output example: store the scaling context in the stream context

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This commit is contained in:
Anton Khirnov 2014-06-24 10:21:07 +02:00
parent 6a927d7aaf
commit a7fcd4122b
1 changed files with 11 additions and 9 deletions
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20
doc/examples/output.c
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@ -55,6 +55,8 @@ typedef struct OutputStream {
AVFrame *tmp_frame;
float t, tincr, tincr2;
struct SwsContext *sws_ctx;
} OutputStream;
/**************************************************************/
@ -327,7 +329,6 @@ static void write_video_frame(AVFormatContext *oc, OutputStream *ost)
{
int ret;
AVCodecContext *c;
static struct SwsContext *img_convert_ctx;
c = ost->st->codec;
@ -339,20 +340,20 @@ static void write_video_frame(AVFormatContext *oc, OutputStream *ost)
if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
/* as we only generate a YUV420P picture, we must convert it
* to the codec pixel format if needed */
if (img_convert_ctx == NULL) {
img_convert_ctx = sws_getContext(c->width, c->height,
AV_PIX_FMT_YUV420P,
c->width, c->height,
c->pix_fmt,
SCALE_FLAGS, NULL, NULL, NULL);
if (img_convert_ctx == NULL) {
if (!ost->sws_ctx) {
ost->sws_ctx = sws_getContext(c->width, c->height,
AV_PIX_FMT_YUV420P,
c->width, c->height,
c->pix_fmt,
SCALE_FLAGS, NULL, NULL, NULL);
if (!ost->sws_ctx) {
fprintf(stderr,
"Cannot initialize the conversion context\n");
exit(1);
}
}
fill_yuv_image(ost->tmp_frame, frame_count, c->width, c->height);
sws_scale(img_convert_ctx, ost->tmp_frame->data, ost->tmp_frame->linesize,
sws_scale(ost->sws_ctx, ost->tmp_frame->data, ost->tmp_frame->linesize,
0, c->height, ost->frame->data, ost->frame->linesize);
} else {
fill_yuv_image(ost->frame, frame_count, c->width, c->height);
@ -401,6 +402,7 @@ static void close_stream(AVFormatContext *oc, OutputStream *ost)
avcodec_close(ost->st->codec);
av_frame_free(&ost->frame);
av_frame_free(&ost->tmp_frame);
sws_freeContext(ost->sws_ctx);
}
/**************************************************************/