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Added support for instances where linesize[0] is negative.

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Based on patch by Jason Askew, jason dot askew at gmail dot com.

Originally committed as revision 9006 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Benjamin Larsson 2007-05-12 19:37:26 +00:00
parent 7f58baa8ca
commit d2bc04738b
1 changed files with 12 additions and 3 deletions
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15
libavcodec/flashsvenc.c
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@ -234,6 +234,7 @@ static int flashsv_encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_siz
FlashSVContext * const s = avctx->priv_data;
AVFrame *pict = data;
AVFrame * const p = &s->frame;
uint8_t *pfptr;
int res;
int I_frame = 0;
int opt_w, opt_h;
@ -242,7 +243,7 @@ static int flashsv_encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_siz
/* First frame needs to be a keyframe */
if (avctx->frame_number == 0) {
s->previous_frame = av_mallocz(p->linesize[0]*s->image_height);
s->previous_frame = av_mallocz(abs(p->linesize[0])*s->image_height);
if (!s->previous_frame) {
av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
return -1;
@ -250,6 +251,11 @@ static int flashsv_encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_siz
I_frame = 1;
}
if (p->linesize[0] < 0)
pfptr = s->previous_frame - ((s->image_height-1) * p->linesize[0]);
else
pfptr = s->previous_frame;
/* Check the placement of keyframes */
if (avctx->gop_size > 0) {
if (avctx->frame_number >= s->last_key_frame + avctx->gop_size) {
@ -298,10 +304,13 @@ static int flashsv_encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_siz
return -1;
}
res = encode_bitstream(s, p, buf, buf_size, opt_w*16, opt_h*16, s->previous_frame, &I_frame);
res = encode_bitstream(s, p, buf, buf_size, opt_w*16, opt_h*16, pfptr, &I_frame);
#endif
//save the current frame
memcpy(s->previous_frame, p->data[0], s->image_height*p->linesize[0]);
if(p->linesize[0] > 0)
memcpy(s->previous_frame, p->data[0], s->image_height*p->linesize[0]);
else
memcpy(s->previous_frame, p->data[0] + p->linesize[0] * (s->image_height-1), s->image_height*abs(p->linesize[0]));
//mark the frame type so the muxer can mux it correctly
if (I_frame) {