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examples/decoding_encoding: prefer 'frame' over 'picture' for an AVFrame

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Decrease confusion.
This commit is contained in:
Stefano Sabatini 2012-10-20 11:07:16 +02:00
parent dd84efe3c7
commit d3b8d56e06
1 changed files with 19 additions and 19 deletions
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38
doc/examples/decoding_encoding.c
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@ -491,9 +491,9 @@ static void video_decode_example(const char *outfilename, const char *filename)
{
AVCodec *codec;
AVCodecContext *c= NULL;
int frame, got_picture, len;
int frame_count, got_frame, len;
FILE *f;
AVFrame *picture;
AVFrame *frame;
uint8_t inbuf[INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
char buf[1024];
AVPacket avpkt;
@ -537,13 +537,13 @@ static void video_decode_example(const char *outfilename, const char *filename)
exit(1);
}
picture = avcodec_alloc_frame();
if (!picture) {
frame = avcodec_alloc_frame();
if (!frame) {
fprintf(stderr, "Could not allocate video frame\n");
exit(1);
}
frame = 0;
frame_count = 0;
for(;;) {
avpkt.size = fread(inbuf, 1, INBUF_SIZE, f);
if (avpkt.size == 0)
@ -566,21 +566,21 @@ static void video_decode_example(const char *outfilename, const char *filename)
feed decoder and see if it could decode a frame */
avpkt.data = inbuf;
while (avpkt.size > 0) {
len = avcodec_decode_video2(c, picture, &got_picture, &avpkt);
len = avcodec_decode_video2(c, frame, &got_frame, &avpkt);
if (len < 0) {
fprintf(stderr, "Error while decoding frame %d\n", frame);
fprintf(stderr, "Error while decoding frame %d\n", frame_count);
exit(1);
}
if (got_picture) {
printf("Saving frame %3d\n", frame);
if (got_frame) {
printf("Saving frame %3d\n", frame_count);
fflush(stdout);
/* the picture is allocated by the decoder. no need to
free it */
snprintf(buf, sizeof(buf), outfilename, frame);
pgm_save(picture->data[0], picture->linesize[0],
snprintf(buf, sizeof(buf), outfilename, frame_count);
pgm_save(frame->data[0], frame->linesize[0],
c->width, c->height, buf);
frame++;
frame_count++;
}
avpkt.size -= len;
avpkt.data += len;
@ -592,24 +592,24 @@ static void video_decode_example(const char *outfilename, const char *filename)
chance to get the last frame of the video */
avpkt.data = NULL;
avpkt.size = 0;
len = avcodec_decode_video2(c, picture, &got_picture, &avpkt);
if (got_picture) {
printf("Saving last frame %3d\n", frame);
len = avcodec_decode_video2(c, frame, &got_frame, &avpkt);
if (got_frame) {
printf("Saving last frame %3d\n", frame_count);
fflush(stdout);
/* the picture is allocated by the decoder. no need to
free it */
snprintf(buf, sizeof(buf), outfilename, frame);
pgm_save(picture->data[0], picture->linesize[0],
snprintf(buf, sizeof(buf), outfilename, frame_count);
pgm_save(frame->data[0], frame->linesize[0],
c->width, c->height, buf);
frame++;
frame_count++;
}
fclose(f);
avcodec_close(c);
av_free(c);
avcodec_free_frame(&picture);
avcodec_free_frame(&frame);
printf("\n");
}