*/
/**
- * @file h264_parser.c
+ * @file libavcodec/h264_parser.c
* H.264 / AVC / MPEG4 part10 parser.
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#include "parser.h"
#include "h264_parser.h"
+#include "h264data.h"
+#include "golomb.h"
#include <assert.h>
for(i=0; i<buf_size; i++){
if(state==7){
+#if HAVE_FAST_UNALIGNED
+ /* we check i<buf_size instead of i+3/7 because its simpler
+ * and there should be FF_INPUT_BUFFER_PADDING_SIZE bytes at the end
+ */
+# if HAVE_FAST_64BIT
+ while(i<buf_size && !((~*(const uint64_t*)(buf+i) & (*(const uint64_t*)(buf+i) - 0x0101010101010101ULL)) & 0x8080808080808080ULL))
+ i+=8;
+# else
+ while(i<buf_size && !((~*(const uint32_t*)(buf+i) & (*(const uint32_t*)(buf+i) - 0x01010101U)) & 0x80808080U))
+ i+=4;
+# endif
+#endif
for(; i<buf_size; i++){
if(!buf[i]){
state=2;
else state>>=1; //2->1, 1->0, 0->0
}else if(state<=5){
int v= buf[i] & 0x1F;
- if(v==7 || v==8 || v==9){
+ if(v==6 || v==7 || v==8 || v==9){
if(pc->frame_start_found){
i++;
-found:
- pc->state=7;
- pc->frame_start_found= 0;
- return i-(state&5);
+ goto found;
}
}else if(v==1 || v==2 || v==5){
if(pc->frame_start_found){
}
pc->state= state;
return END_NOT_FOUND;
+
+found:
+ pc->state=7;
+ pc->frame_start_found= 0;
+ return i-(state&5);
+}
+
+/*!
+ * Parse NAL units of found picture and decode some basic information.
+ *
+ * @param s parser context.
+ * @param avctx codec context.
+ * @param buf buffer with field/frame data.
+ * @param buf_size size of the buffer.
+ */
+static inline int parse_nal_units(AVCodecParserContext *s,
+ AVCodecContext *avctx,
+ const uint8_t *buf, int buf_size)
+{
+ H264Context *h = s->priv_data;
+ const uint8_t *buf_end = buf + buf_size;
+ unsigned int pps_id;
+ unsigned int slice_type;
+ int state = -1;
+ const uint8_t *ptr;
+
+ /* set some sane default values */
+ s->pict_type = FF_I_TYPE;
+ s->key_frame = 0;
+
+ h->s.avctx= avctx;
+ h->sei_recovery_frame_cnt = -1;
+ h->sei_dpb_output_delay = 0;
+ h->sei_cpb_removal_delay = -1;
+ h->sei_buffering_period_present = 0;
+
+ for(;;) {
+ int src_length, dst_length, consumed;
+ buf = ff_find_start_code(buf, buf_end, &state);
+ if(buf >= buf_end)
+ break;
+ --buf;
+ src_length = buf_end - buf;
+ switch (state & 0x1f) {
+ case NAL_SLICE:
+ case NAL_IDR_SLICE:
+ // Do not walk the whole buffer just to decode slice header
+ if (src_length > 20)
+ src_length = 20;
+ break;
+ }
+ ptr= ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length);
+ if (ptr==NULL || dst_length < 0)
+ break;
+
+ init_get_bits(&h->s.gb, ptr, 8*dst_length);
+ switch(h->nal_unit_type) {
+ case NAL_SPS:
+ ff_h264_decode_seq_parameter_set(h);
+ break;
+ case NAL_PPS:
+ ff_h264_decode_picture_parameter_set(h, h->s.gb.size_in_bits);
+ break;
+ case NAL_SEI:
+ ff_h264_decode_sei(h);
+ break;
+ case NAL_IDR_SLICE:
+ s->key_frame = 1;
+ /* fall through */
+ case NAL_SLICE:
+ get_ue_golomb(&h->s.gb); // skip first_mb_in_slice
+ slice_type = get_ue_golomb_31(&h->s.gb);
+ s->pict_type = golomb_to_pict_type[slice_type % 5];
+ if (h->sei_recovery_frame_cnt >= 0) {
+ /* key frame, since recovery_frame_cnt is set */
+ s->key_frame = 1;
+ }
+ pps_id= get_ue_golomb(&h->s.gb);
+ if(pps_id>=MAX_PPS_COUNT) {
+ av_log(h->s.avctx, AV_LOG_ERROR, "pps_id out of range\n");
+ return -1;
+ }
+ if(!h->pps_buffers[pps_id]) {
+ av_log(h->s.avctx, AV_LOG_ERROR, "non-existing PPS referenced\n");
+ return -1;
+ }
+ h->pps= *h->pps_buffers[pps_id];
+ if(!h->sps_buffers[h->pps.sps_id]) {
+ av_log(h->s.avctx, AV_LOG_ERROR, "non-existing SPS referenced\n");
+ return -1;
+ }
+ h->sps = *h->sps_buffers[h->pps.sps_id];
+ h->frame_num = get_bits(&h->s.gb, h->sps.log2_max_frame_num);
+
+ avctx->profile = h->sps.profile_idc;
+ avctx->level = h->sps.level_idc;
+
+ if(h->sps.frame_mbs_only_flag){
+ h->s.picture_structure= PICT_FRAME;
+ }else{
+ if(get_bits1(&h->s.gb)) { //field_pic_flag
+ h->s.picture_structure= PICT_TOP_FIELD + get_bits1(&h->s.gb); //bottom_field_flag
+ } else {
+ h->s.picture_structure= PICT_FRAME;
+ }
+ }
+
+ if(h->sps.pic_struct_present_flag) {
+ switch (h->sei_pic_struct) {
+ case SEI_PIC_STRUCT_TOP_FIELD:
+ case SEI_PIC_STRUCT_BOTTOM_FIELD:
+ s->repeat_pict = 0;
+ break;
+ case SEI_PIC_STRUCT_FRAME:
+ case SEI_PIC_STRUCT_TOP_BOTTOM:
+ case SEI_PIC_STRUCT_BOTTOM_TOP:
+ s->repeat_pict = 1;
+ break;
+ case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
+ case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
+ s->repeat_pict = 2;
+ break;
+ case SEI_PIC_STRUCT_FRAME_DOUBLING:
+ s->repeat_pict = 3;
+ break;
+ case SEI_PIC_STRUCT_FRAME_TRIPLING:
+ s->repeat_pict = 5;
+ break;
+ default:
+ s->repeat_pict = h->s.picture_structure == PICT_FRAME ? 1 : 0;
+ break;
+ }
+ } else {
+ s->repeat_pict = h->s.picture_structure == PICT_FRAME ? 1 : 0;
+ }
+
+ return 0; /* no need to evaluate the rest */
+ }
+ buf += consumed;
+ }
+ /* didn't find a picture! */
+ av_log(h->s.avctx, AV_LOG_ERROR, "missing picture in access unit\n");
+ return -1;
}
static int h264_parse(AVCodecParserContext *s,
assert(pc->last_index + next >= 0 );
ff_h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); //update state
}
+
+ parse_nal_units(s, avctx, buf, buf_size);
+
+ if (h->sei_cpb_removal_delay >= 0) {
+ s->dts_sync_point = h->sei_buffering_period_present;
+ s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
+ s->pts_dts_delta = h->sei_dpb_output_delay;
+ } else {
+ s->dts_sync_point = INT_MIN;
+ s->dts_ref_dts_delta = INT_MIN;
+ s->pts_dts_delta = INT_MIN;
+ }
}
*poutbuf = buf;
return 0;
}
+static void close(AVCodecParserContext *s)
+{
+ H264Context *h = s->priv_data;
+ ParseContext *pc = &h->s.parse_context;
+
+ av_free(pc->buffer);
+ ff_h264_free_context(h);
+}
+
+static int init(AVCodecParserContext *s)
+{
+ H264Context *h = s->priv_data;
+ h->thread_context[0] = h;
+ return 0;
+}
AVCodecParser h264_parser = {
{ CODEC_ID_H264 },
sizeof(H264Context),
- NULL,
+ init,
h264_parse,
- ff_parse_close,
+ close,
h264_split,
};
projects / ffmpeg / blobdiff