Created
October 9, 2014 07:10
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scale
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// scale video | |
static AVFrame* scale_encode_write_frame(AVFrame *frame, int src_w, int src_h, | |
int dst_w, int dst_h) { | |
int ret = 0; | |
AVFrame *scale_frame; | |
scale_frame = av_frame_alloc(); | |
if (!scale_frame) { | |
av_log(NULL, AV_LOG_DEBUG, "Cannot get allocate scale frame\n"); | |
return frame; | |
} | |
struct SwsContext *scale_context = NULL; | |
scale_context = sws_getContext(src_w, src_h, | |
AV_PIX_FMT_YUV420P, | |
dst_w, dst_h, | |
AV_PIX_FMT_YUV420P, SWS_BILINEAR, NULL, NULL, NULL); | |
if (!scale_context) { | |
av_log(NULL, AV_LOG_DEBUG, "Cannot get scaling context\n"); | |
av_frame_free(&scale_frame); | |
return frame; | |
} | |
if ((ret = av_image_alloc(scale_frame->data, scale_frame->linesize, | |
dst_w, dst_h, AV_PIX_FMT_YUV420P, 1)) < 0) { | |
fprintf(stderr, "Could not allocate destination image\n"); | |
av_frame_free(&scale_frame); | |
return frame; | |
} | |
ret = sws_scale(scale_context, (const uint8_t* const*) frame->data, | |
//ret = sws_scale(scale_context, frame->data, | |
frame->linesize, 0, src_h, | |
scale_frame->data, scale_frame->linesize); | |
sws_freeContext(scale_context); | |
if (ret < 0) { | |
av_frame_free(&scale_frame); | |
return frame; | |
} else { | |
printf("Using scale frame\n"); | |
scale_frame->pts = av_frame_get_best_effort_timestamp(scale_frame); | |
scale_frame->pict_type = AV_PICTURE_TYPE_NONE; | |
av_frame_free(&frame); | |
return scale_frame; | |
} | |
} |
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