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Code Issues Releases Activity

Correct reference buffer switching in Indeo 5 decoder.

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Patch by Maxim ($indeo5decauthor)

Originally committed as revision 22580 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Maxim Poliakovski 2010-03-17 07:53:12 +00:00 committed by Kostya Shishkov
parent 6eec969d54
commit ace38c36bf
1 changed files with 27 additions and 39 deletions
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66
libavcodec/indeo5.c
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@ -57,8 +57,10 @@ typedef struct {
IVIPlaneDesc planes[3]; ///< color planes
const uint8_t *frame_data; ///< input frame data pointer
int buf_switch; ///< used to switch between three buffers
int inter_scal; ///< signals a sequence of scalable inter frames
int dst_buf; ///< buffer index for the currently decoded frame
int ref_buf; ///< inter frame reference buffer index
int ref2_buf; ///< temporal storage for switching buffers
uint32_t frame_size; ///< frame size in bytes
int frame_type;
int prev_frame_type; ///< frame type of the previous frame
@ -648,53 +650,38 @@ static int decode_band(IVI5DecContext *ctx, int plane_num,
*/
static void switch_buffers(IVI5DecContext *ctx, AVCodecContext *avctx)
{
switch (ctx->frame_type) {
switch (ctx->prev_frame_type) {
case FRAMETYPE_INTRA:
ctx->buf_switch = 0;
ctx->dst_buf = 0;
ctx->ref_buf = 0;
break;
case FRAMETYPE_INTER:
ctx->buf_switch &= 1;
/* swap buffers only if there were no droppable frames */
if (ctx->prev_frame_type != FRAMETYPE_INTER_NOREF &&
ctx->prev_frame_type != FRAMETYPE_INTER_SCAL)
ctx->buf_switch ^= 1;
ctx->buf_switch ^= 1;
ctx->dst_buf = ctx->buf_switch;
ctx->ref_buf = ctx->buf_switch ^ 1;
break;
case FRAMETYPE_INTER_SCAL:
if (ctx->prev_frame_type == FRAMETYPE_INTER_NOREF)
break;
if (ctx->prev_frame_type != FRAMETYPE_INTER_SCAL) {
ctx->buf_switch ^= 1;
ctx->dst_buf = ctx->buf_switch;
ctx->ref_buf = ctx->buf_switch ^ 1;
} else {
ctx->buf_switch ^= 2;
ctx->dst_buf = 2;
ctx->ref_buf = ctx->buf_switch & 1;
if (!(ctx->buf_switch & 2))
FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
if (!ctx->inter_scal) {
ctx->ref2_buf = 2;
ctx->inter_scal = 1;
}
FFSWAP(int, ctx->dst_buf, ctx->ref2_buf);
ctx->ref_buf = ctx->ref2_buf;
break;
case FRAMETYPE_INTER_NOREF:
if (ctx->prev_frame_type == FRAMETYPE_INTER_SCAL) {
ctx->buf_switch ^= 2;
ctx->dst_buf = 2;
ctx->ref_buf = ctx->buf_switch & 1;
if (!(ctx->buf_switch & 2))
FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
} else {
ctx->buf_switch ^= 1;
ctx->dst_buf = ctx->buf_switch & 1;
ctx->ref_buf = (ctx->buf_switch & 1) ^ 1;
}
break;
}
switch (ctx->frame_type) {
case FRAMETYPE_INTRA:
ctx->buf_switch = 0;
/* FALLTHROUGH */
case FRAMETYPE_INTER:
ctx->inter_scal = 0;
ctx->dst_buf = ctx->buf_switch;
ctx->ref_buf = ctx->buf_switch ^ 1;
break;
case FRAMETYPE_INTER_SCAL:
case FRAMETYPE_INTER_NOREF:
case FRAMETYPE_NULL:
return;
default:
av_log(avctx, AV_LOG_ERROR, "unsupported frame type: %d\n", ctx->frame_type);
break;
}
}
@ -729,6 +716,9 @@ static av_cold int decode_init(AVCodecContext *avctx)
return -1;
}
ctx->buf_switch = 0;
ctx->inter_scal = 0;
avctx->pix_fmt = PIX_FMT_YUV410P;
return 0;
@ -766,9 +756,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
//START_TIMER;
if (ctx->frame_type == FRAMETYPE_NULL) {
ctx->frame_type = ctx->prev_frame_type;
} else {
if (ctx->frame_type != FRAMETYPE_NULL) {
for (p = 0; p < 3; p++) {
for (b = 0; b < ctx->planes[p].num_bands; b++) {
result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);