aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/mpeg12.c
diff options
context:
space:
mode:
authorMichael Niedermayer <michaelni@gmx.at>2004-02-23 20:56:56 +0000
committerMichael Niedermayer <michaelni@gmx.at>2004-02-23 20:56:56 +0000
commitc62c07d3d7d204527bfa991bac1204cbb593747b (patch)
tree207c61727f1c992fe1a05eef9c96a7cc34f6d143 /libavcodec/mpeg12.c
parentc0a2c42f59329811fc08a2c982d394ab49204b01 (diff)
downloadffmpeg-c62c07d3d7d204527bfa991bac1204cbb593747b.tar.gz
multithreaded mpeg2 decoding
Originally committed as revision 2810 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/mpeg12.c')
-rw-r--r--libavcodec/mpeg12.c189
1 files changed, 127 insertions, 62 deletions
diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c
index 748c0fb9bb..be2209ce13 100644
--- a/libavcodec/mpeg12.c
+++ b/libavcodec/mpeg12.c
@@ -1707,6 +1707,7 @@ typedef struct Mpeg1Context {
int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
int repeat_field; /* true if we must repeat the field */
AVPanScan pan_scan; /** some temporary storage for the panscan */
+ int slice_count;
} Mpeg1Context;
static int mpeg_decode_init(AVCodecContext *avctx)
@@ -2015,43 +2016,14 @@ short * tmp;
s->pblocks[5] = tmp;
}
-#define DECODE_SLICE_FATAL_ERROR -2
-#define DECODE_SLICE_ERROR -1
-#define DECODE_SLICE_OK 0
-
-/**
- * decodes a slice.
- * @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
- * DECODE_SLICE_ERROR if the slice is damaged<br>
- * DECODE_SLICE_OK if this slice is ok<br>
- */
-static int mpeg_decode_slice(AVCodecContext *avctx,
- AVFrame *pict,
- int start_code,
- uint8_t **buf, int buf_size)
-{
- Mpeg1Context *s1 = avctx->priv_data;
- MpegEncContext *s = &s1->mpeg_enc_ctx;
- int ret;
- const int field_pic= s->picture_structure != PICT_FRAME;
+static int mpeg_field_start(MpegEncContext *s){
+ AVCodecContext *avctx= s->avctx;
+ Mpeg1Context *s1 = (Mpeg1Context*)s;
- s->resync_mb_x= s->mb_x =
- s->resync_mb_y= s->mb_y = -1;
-
- start_code = (start_code - 1) & 0xff;
- if (start_code >= s->mb_height){
- av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", start_code, s->mb_height);
- return -1;
- }
-
- ff_mpeg1_clean_buffers(s);
- s->interlaced_dct = 0;
-
/* start frame decoding */
- if (s->first_slice) {
- if(s->first_field || s->picture_structure==PICT_FRAME){
+ if(s->first_field || s->picture_structure==PICT_FRAME){
if(MPV_frame_start(s, avctx) < 0)
- return DECODE_SLICE_FATAL_ERROR;
+ return -1;
ff_er_frame_start(s);
@@ -2069,7 +2041,7 @@ static int mpeg_decode_slice(AVCodecContext *avctx,
}
*s->current_picture_ptr->pan_scan= s1->pan_scan;
- }else{ //second field
+ }else{ //second field
int i;
if(!s->current_picture_ptr){
@@ -2083,30 +2055,48 @@ static int mpeg_decode_slice(AVCodecContext *avctx,
s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
}
}
- }
+ }
#ifdef HAVE_XVMC
// MPV_frame_start will call this function too,
// but we need to call it on every field
- if(s->avctx->xvmc_acceleration)
+ if(s->avctx->xvmc_acceleration)
XVMC_field_start(s,avctx);
#endif
- }//fi(s->first_slice)
+ return 0;
+}
+
+#define DECODE_SLICE_ERROR -1
+#define DECODE_SLICE_OK 0
+
+/**
+ * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
+ * @return DECODE_SLICE_ERROR if the slice is damaged<br>
+ * DECODE_SLICE_OK if this slice is ok<br>
+ */
+static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
+ uint8_t **buf, int buf_size)
+{
+ MpegEncContext *s = &s1->mpeg_enc_ctx;
+ AVCodecContext *avctx= s->avctx;
+ int ret;
+ const int field_pic= s->picture_structure != PICT_FRAME;
+
+ s->resync_mb_x=
+ s->resync_mb_y= -1;
+
+ if (mb_y >= s->mb_height){
+ av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", s->mb_y, s->mb_height);
+ return -1;
+ }
+
init_get_bits(&s->gb, *buf, buf_size*8);
+ ff_mpeg1_clean_buffers(s);
+ s->interlaced_dct = 0;
+
s->qscale = get_qscale(s);
- if (s->first_slice && (s->first_field || s->picture_structure==PICT_FRAME)) {
- if(s->avctx->debug&FF_DEBUG_PICT_INFO){
- av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
- s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1],
- s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
- s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
- s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
- s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
- }
- }
- s->first_slice = 0;
if(s->qscale == 0){
av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
return -1;
@@ -2135,12 +2125,23 @@ static int mpeg_decode_slice(AVCodecContext *avctx,
break;
}
}
-
+
s->resync_mb_x= s->mb_x;
- s->resync_mb_y= s->mb_y = start_code;
+ s->resync_mb_y= s->mb_y= mb_y;
s->mb_skip_run= 0;
ff_init_block_index(s);
+ if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
+ if(s->avctx->debug&FF_DEBUG_PICT_INFO){
+ av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
+ s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1],
+ s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
+ s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
+ s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
+ s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
+ }
+ }
+
for(;;) {
#ifdef HAVE_XVMC
//one 1 we memcpy blocks in xvmcvideo
@@ -2268,6 +2269,39 @@ eos: // end of slice
return 0;
}
+static int slice_decode_thread(AVCodecContext *c, void *arg){
+ MpegEncContext *s= arg;
+ uint8_t *buf= s->gb.buffer;
+ int mb_y= s->start_mb_y;
+
+ s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
+
+ for(;;){
+ int start_code, ret;
+
+ ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
+ emms_c();
+//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
+//ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
+ if(ret < 0){
+ if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
+ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
+ }else{
+ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
+ }
+
+ if(s->mb_y == s->end_mb_y)
+ return 0;
+
+ start_code = find_start_code(&buf, s->gb.buffer_end);
+ mb_y= start_code - SLICE_MIN_START_CODE;
+ if(mb_y < 0 || mb_y >= s->end_mb_y)
+ return -1;
+ }
+
+ return 0; //not reached
+}
+
/**
* handles slice ends.
* @return 1 if it seems to be the last slice of
@@ -2621,12 +2655,21 @@ static int mpeg_decode_frame(AVCodecContext *avctx,
if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
vcr2_init_sequence(avctx);
-
+
+ s->slice_count= 0;
+
for(;;) {
/* find start next code */
start_code = find_start_code(&buf_ptr, buf_end);
if (start_code < 0){
if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
+ if(avctx->thread_count > 1){
+ int i;
+
+ avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count);
+ for(i=0; i<s->slice_count; i++)
+ s2->error_count += s2->thread_context[i]->error_count;
+ }
if (slice_end(avctx, picture)) {
if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
*data_size = sizeof(AVPicture);
@@ -2667,6 +2710,7 @@ static int mpeg_decode_frame(AVCodecContext *avctx,
default:
if (start_code >= SLICE_MIN_START_CODE &&
start_code <= SLICE_MAX_START_CODE) {
+ int mb_y= start_code - SLICE_MIN_START_CODE;
/* skip b frames if we dont have reference frames */
if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
@@ -2676,17 +2720,38 @@ static int mpeg_decode_frame(AVCodecContext *avctx,
if(avctx->hurry_up>=5) break;
if (!s->mpeg_enc_ctx_allocated) break;
-
- ret = mpeg_decode_slice(avctx, picture,
- start_code, &buf_ptr, input_size);
- emms_c();
-
- if(ret < 0){
- if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
- ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
- if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
+
+ if(s2->first_slice){
+ s2->first_slice=0;
+ if(mpeg_field_start(s2) < 0)
+ return -1;
+ }
+
+ if(avctx->thread_count > 1){
+ int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
+ if(threshold <= mb_y){
+ MpegEncContext *thread_context= s2->thread_context[s->slice_count];
+
+ thread_context->start_mb_y= mb_y;
+ thread_context->end_mb_y = s2->mb_height;
+ if(s->slice_count){
+ s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
+ ff_update_duplicate_context(thread_context, s2);
+ }
+ init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
+ s->slice_count++;
+ }
+ buf_ptr += 2; //FIXME add minimum num of bytes per slice
}else{
- ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
+ ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
+ emms_c();
+
+ if(ret < 0){
+ if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
+ ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
+ }else{
+ ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
+ }
}
}
break;