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Code Issues Releases Activity

10l (keyframes and context resets)

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Originally committed as revision 3426 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-08-31 16:28:49 +00:00
parent 39c61bbbd3
commit 19aa028dc5
1 changed files with 13 additions and 10 deletions
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23
libavcodec/snow.c
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@ -400,6 +400,7 @@ typedef struct SnowContext{
uint8_t header_state[32];
uint8_t block_state[128 + 32*128];
int keyframe;
int always_reset;
int version;
int spatial_decomposition_type;
int temporal_decomposition_type;
@ -1526,7 +1527,7 @@ static inline void decode_subband(SnowContext *s, SubBand *b, DWTELEM *src, DWTE
static void reset_contexts(SnowContext *s){
int plane_index, level, orientation;
for(plane_index=0; plane_index<2; plane_index++){
for(plane_index=0; plane_index<3; plane_index++){
for(level=0; level<s->spatial_decomposition_count; level++){
for(orientation=level ? 1:0; orientation<4; orientation++){
memset(s->plane[plane_index].band[level][orientation].state, 0, sizeof(s->plane[plane_index].band[level][orientation].state));
@ -2261,10 +2262,14 @@ static void correlate(SnowContext *s, SubBand *b, DWTELEM *src, int stride, int
static void encode_header(SnowContext *s){
int plane_index, level, orientation;
uint8_t kstate[32]={0};
put_cabac(&s->c, s->header_state, s->keyframe); // state clearing stuff?
put_cabac(&s->c, kstate, s->keyframe);
if(s->keyframe || s->always_reset)
reset_contexts(s);
if(s->keyframe){
put_symbol(&s->c, s->header_state, s->version, 0);
put_cabac(&s->c, s->header_state, s->always_reset);
put_symbol(&s->c, s->header_state, s->temporal_decomposition_type, 0);
put_symbol(&s->c, s->header_state, s->temporal_decomposition_count, 0);
put_symbol(&s->c, s->header_state, s->spatial_decomposition_count, 0);
@ -2292,14 +2297,18 @@ static void encode_header(SnowContext *s){
static int decode_header(SnowContext *s){
int plane_index, level, orientation;
uint8_t kstate[32]={0};
s->keyframe= get_cabac(&s->c, s->header_state);
s->keyframe= get_cabac(&s->c, kstate);
if(s->keyframe || s->always_reset)
reset_contexts(s);
if(s->keyframe){
s->version= get_symbol(&s->c, s->header_state, 0);
if(s->version>0){
av_log(s->avctx, AV_LOG_ERROR, "version %d not supported", s->version);
return -1;
}
s->always_reset= get_cabac(&s->c, s->header_state);
s->temporal_decomposition_type= get_symbol(&s->c, s->header_state, 0);
s->temporal_decomposition_count= get_symbol(&s->c, s->header_state, 0);
s->spatial_decomposition_count= get_symbol(&s->c, s->header_state, 0);
@ -2522,9 +2531,6 @@ static int frame_start(SnowContext *s){
int w= s->avctx->width; //FIXME round up to x16 ?
int h= s->avctx->height;
if(s->keyframe)
reset_contexts(s);
if(s->current_picture.data[0]){
draw_edges(s->current_picture.data[0], s->current_picture.linesize[0], w , h , EDGE_WIDTH );
draw_edges(s->current_picture.data[1], s->current_picture.linesize[1], w>>1, h>>1, EDGE_WIDTH/2);
@ -2557,8 +2563,6 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
s->input_picture = *pict;
memset(s->header_state, 0, sizeof(s->header_state));
s->keyframe=avctx->gop_size==0 || avctx->frame_number % avctx->gop_size == 0;
pict->pict_type= s->keyframe ? FF_I_TYPE : FF_P_TYPE;
@ -2571,6 +2575,7 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
}
frame_start(s);
s->current_picture.key_frame= s->keyframe;
if(pict->pict_type == P_TYPE){
int block_width = (width +15)>>4;
@ -2777,8 +2782,6 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8
ff_init_cabac_decoder(c, buf, buf_size);
ff_init_cabac_states(c, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64);
memset(s->header_state, 0, sizeof(s->header_state));
s->current_picture.pict_type= FF_I_TYPE; //FIXME I vs. P
decode_header(s);
if(!s->block) alloc_blocks(s);