videolan/ffmpeg
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fix decoder so that ffmpeg does not crash, at least not right away

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Originally committed as revision 1838 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson 2003-05-06 03:11:20 +00:00
parent 814b648c75
commit 61873c4a44
1 changed files with 16 additions and 17 deletions
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33
libavcodec/vp3.c
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@ -210,8 +210,6 @@ static int ModeAlphabet[7][CODING_MODE_COUNT] =
typedef struct Vp3DecodeContext {
AVCodecContext *avctx;
int width, height;
unsigned char *current_picture[3]; /* picture structure */
int linesize[3];
AVFrame golden_frame;
AVFrame last_frame;
AVFrame current_frame;
@ -1966,20 +1964,20 @@ static void render_fragments(Vp3DecodeContext *s,
if (plane == 0) {
dequantizer = s->intra_y_dequant;
output_plane = s->current_frame.data[0];
last_plane = s->current_frame.data[0];
golden_plane = s->current_frame.data[0];
last_plane = s->last_frame.data[0];
golden_plane = s->golden_frame.data[0];
stride = -s->current_frame.linesize[0];
} else if (plane == 1) {
dequantizer = s->intra_c_dequant;
output_plane = s->current_frame.data[1];
last_plane = s->current_frame.data[1];
golden_plane = s->current_frame.data[1];
last_plane = s->last_frame.data[1];
golden_plane = s->golden_frame.data[1];
stride = -s->current_frame.linesize[1];
} else {
dequantizer = s->intra_c_dequant;
output_plane = s->current_frame.data[2];
last_plane = s->current_frame.data[2];
golden_plane = s->current_frame.data[2];
last_plane = s->last_frame.data[2];
golden_plane = s->golden_frame.data[2];
stride = -s->current_frame.linesize[2];
}
@ -2189,6 +2187,12 @@ static int vp3_decode_init(AVCodecContext *avctx)
s->macroblock_coded = av_malloc(s->macroblock_count + 1);
init_block_mapping(s);
/* make sure that frames are available to be freed on the first decode */
if(avctx->get_buffer(avctx, &s->golden_frame) < 0) {
printf("vp3: get_buffer() failed\n");
return -1;
}
return 0;
}
@ -2220,8 +2224,7 @@ static int vp3_decode_frame(AVCodecContext *avctx,
if (s->keyframe) {
/* release the previous golden frame and get a new one */
if (counter > 1)
avctx->release_buffer(avctx, &s->golden_frame);
avctx->release_buffer(avctx, &s->golden_frame);
s->golden_frame.reference = 0;
if(avctx->get_buffer(avctx, &s->golden_frame) < 0) {
@ -2229,11 +2232,8 @@ static int vp3_decode_frame(AVCodecContext *avctx,
return -1;
}
/* last frame is hereby invalidated */
avctx->release_buffer(avctx, &s->last_frame);
/* golden frame is also the current frame */
s->current_frame = s->golden_frame;
memcpy(&s->current_frame, &s->golden_frame, sizeof(AVFrame));
/* time to figure out pixel addresses? */
if (!s->pixel_addresses_inited)
@ -2276,15 +2276,14 @@ static int vp3_decode_frame(AVCodecContext *avctx,
render_fragments(s, s->v_fragment_start,
s->fragment_width / 2, s->fragment_height / 2, 2);
*data_size=sizeof(AVFrame);
*(AVFrame*)data= s->current_frame;
/* release the last frame, if it was allocated */
avctx->release_buffer(avctx, &s->last_frame);
/* shuffle frames */
s->last_frame = s->current_frame;
/* shuffle frames (last = current) */
memcpy(&s->last_frame, &s->current_frame, sizeof(AVFrame));
return buf_size;
}