Merge commit '528daa399018af74d52192eb1861d2b59d256111'
[ffmpeg.git] / libavcodec / h264_parser.c
index 27f68d2..6e3e65b 100644 (file)
  */
 
 /**
- * @file libavcodec/h264_parser.c
+ * @file
  * H.264 / AVC / MPEG4 part10 parser.
  * @author Michael Niedermayer <michaelni@gmx.at>
  */
 
+#define UNCHECKED_BITSTREAM_READER 1
+
+#include "libavutil/attributes.h"
 #include "parser.h"
-#include "h264_parser.h"
 #include "h264data.h"
 #include "golomb.h"
-
-#include <assert.h>
+#include "internal.h"
 
 
-int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
+static int h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
 {
-    int i;
+    int i, j;
     uint32_t state;
-    ParseContext *pc = &(h->s.parse_context);
-//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
+    ParseContext *pc = &h->parse_context;
+    int next_avc= h->is_avc ? 0 : buf_size;
+
 //    mb_addr= pc->mb_addr - 1;
     state= pc->state;
     if(state>13)
         state= 7;
 
+    if(h->is_avc && !h->nal_length_size)
+        av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
+
     for(i=0; i<buf_size; i++){
+        if(i >= next_avc) {
+            int nalsize = 0;
+            i = next_avc;
+            for(j = 0; j < h->nal_length_size; j++)
+                nalsize = (nalsize << 8) | buf[i++];
+            if(nalsize <= 0 || nalsize > buf_size - i){
+                av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i);
+                return buf_size;
+            }
+            next_avc= i + nalsize;
+            state= 5;
+        }
+
         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))
+            while(i<next_avc && !((~*(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))
+            while(i<next_avc && !((~*(const uint32_t*)(buf+i) & (*(const uint32_t*)(buf+i) - 0x01010101U)) & 0x80808080U))
                 i+=4;
 #    endif
 #endif
-            for(; i<buf_size; i++){
+            for(; i<next_avc; i++){
                 if(!buf[i]){
                     state=2;
                     break;
@@ -76,29 +94,44 @@ int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
                     goto found;
                 }
             }else if(v==1 || v==2 || v==5){
+                state+=8;
+                continue;
+            }
+            state= 7;
+        }else{
+            h->parse_history[h->parse_history_count++]= buf[i];
+            if(h->parse_history_count>3){
+                unsigned int mb, last_mb= h->parse_last_mb;
+                GetBitContext gb;
+
+                init_get_bits(&gb, h->parse_history, 8*h->parse_history_count);
+                h->parse_history_count=0;
+                mb= get_ue_golomb_long(&gb);
+                last_mb= h->parse_last_mb;
+                h->parse_last_mb= mb;
                 if(pc->frame_start_found){
-                    state+=8;
-                    continue;
+                    if(mb <= last_mb)
+                        goto found;
                 }else
                     pc->frame_start_found = 1;
+                state= 7;
             }
-            state= 7;
-        }else{
-            if(buf[i] & 0x80)
-                goto found;
-            state= 7;
         }
     }
     pc->state= state;
+    if(h->is_avc)
+        return next_avc;
     return END_NOT_FOUND;
 
 found:
     pc->state=7;
     pc->frame_start_found= 0;
-    return i-(state&5);
+    if(h->is_avc)
+        return next_avc;
+    return i-(state&5) - 3*(state>7);
 }
 
-/*!
+/**
  * Parse NAL units of found picture and decode some basic information.
  *
  * @param s parser context.
@@ -114,26 +147,45 @@ static inline int parse_nal_units(AVCodecParserContext *s,
     const uint8_t *buf_end = buf + buf_size;
     unsigned int pps_id;
     unsigned int slice_type;
-    int state;
+    int state = -1;
     const uint8_t *ptr;
+    int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
+    int field_poc[2];
 
     /* set some sane default values */
-    s->pict_type = FF_I_TYPE;
+    s->pict_type = AV_PICTURE_TYPE_I;
     s->key_frame = 0;
+    s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
 
-    h->s.avctx= avctx;
+    h->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;
 
+    if (!buf_size)
+        return 0;
+
     for(;;) {
-        int src_length, dst_length, consumed;
-        buf = ff_find_start_code(buf, buf_end, &state);
+        int src_length, dst_length, consumed, nalsize = 0;
+        if (h->is_avc) {
+            int i;
+            if (h->nal_length_size >= buf_end - buf) break;
+            nalsize = 0;
+            for (i = 0; i < h->nal_length_size; i++)
+                nalsize = (nalsize << 8) | *buf++;
+            if (nalsize <= 0 || nalsize > buf_end - buf) {
+                av_log(h->avctx, AV_LOG_ERROR, "AVC: nal size %d\n", nalsize);
+                break;
+            }
+            src_length = nalsize;
+        } else {
+        buf = avpriv_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:
@@ -146,55 +198,81 @@ static inline int parse_nal_units(AVCodecParserContext *s,
         if (ptr==NULL || dst_length < 0)
             break;
 
-        init_get_bits(&h->s.gb, ptr, 8*dst_length);
+        init_get_bits(&h->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);
+            ff_h264_decode_picture_parameter_set(h, h->gb.size_in_bits);
             break;
         case NAL_SEI:
             ff_h264_decode_sei(h);
             break;
         case NAL_IDR_SLICE:
             s->key_frame = 1;
+
+            h->prev_frame_num        = 0;
+            h->prev_frame_num_offset = 0;
+            h->prev_poc_msb          =
+            h->prev_poc_lsb          = 0;
             /* 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);
+            get_ue_golomb_long(&h->gb);  // skip first_mb_in_slice
+            slice_type = get_ue_golomb_31(&h->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);
+            pps_id= get_ue_golomb(&h->gb);
             if(pps_id>=MAX_PPS_COUNT) {
-                av_log(h->s.avctx, AV_LOG_ERROR, "pps_id out of range\n");
+                av_log(h->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");
+                av_log(h->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");
+                av_log(h->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);
+            h->frame_num = get_bits(&h->gb, h->sps.log2_max_frame_num);
+
+            avctx->profile = ff_h264_get_profile(&h->sps);
+            avctx->level   = h->sps.level_idc;
 
             if(h->sps.frame_mbs_only_flag){
-                h->s.picture_structure= PICT_FRAME;
+                h->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
+                if(get_bits1(&h->gb)) { //field_pic_flag
+                    h->picture_structure= PICT_TOP_FIELD + get_bits1(&h->gb); //bottom_field_flag
                 } else {
-                    h->s.picture_structure= PICT_FRAME;
+                    h->picture_structure= PICT_FRAME;
                 }
             }
 
+            if (h->nal_unit_type == NAL_IDR_SLICE)
+                get_ue_golomb(&h->gb); /* idr_pic_id */
+            if (h->sps.poc_type == 0) {
+                h->poc_lsb = get_bits(&h->gb, h->sps.log2_max_poc_lsb);
+
+                if (h->pps.pic_order_present == 1 && h->picture_structure == PICT_FRAME)
+                    h->delta_poc_bottom = get_se_golomb(&h->gb);
+            }
+
+            if (h->sps.poc_type == 1 && !h->sps.delta_pic_order_always_zero_flag) {
+                h->delta_poc[0] = get_se_golomb(&h->gb);
+
+                if (h->pps.pic_order_present == 1 && h->picture_structure == PICT_FRAME)
+                    h->delta_poc[1] = get_se_golomb(&h->gb);
+            }
+
+            ff_init_poc(h, field_poc, NULL);
+
             if(h->sps.pic_struct_present_flag) {
                 switch (h->sei_pic_struct) {
                     case SEI_PIC_STRUCT_TOP_FIELD:
@@ -217,19 +295,53 @@ static inline int parse_nal_units(AVCodecParserContext *s,
                         s->repeat_pict = 5;
                         break;
                     default:
-                        s->repeat_pict = h->s.picture_structure == PICT_FRAME ? 1 : 0;
+                        s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
                         break;
                 }
             } else {
-                s->repeat_pict = h->s.picture_structure == PICT_FRAME ? 1 : 0;
+                s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
+            }
+
+            if (h->picture_structure == PICT_FRAME) {
+                s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
+                if (h->sps.pic_struct_present_flag) {
+                    switch (h->sei_pic_struct) {
+                        case SEI_PIC_STRUCT_TOP_BOTTOM:
+                        case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
+                            s->field_order = AV_FIELD_TT;
+                            break;
+                        case SEI_PIC_STRUCT_BOTTOM_TOP:
+                        case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
+                            s->field_order = AV_FIELD_BB;
+                            break;
+                        default:
+                            s->field_order = AV_FIELD_PROGRESSIVE;
+                            break;
+                    }
+                } else {
+                    if (field_poc[0] < field_poc[1])
+                        s->field_order = AV_FIELD_TT;
+                    else if (field_poc[0] > field_poc[1])
+                        s->field_order = AV_FIELD_BB;
+                    else
+                        s->field_order = AV_FIELD_PROGRESSIVE;
+                }
+            } else {
+                if (h->picture_structure == PICT_TOP_FIELD)
+                    s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
+                else
+                    s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
+                s->field_order = AV_FIELD_UNKNOWN;
             }
 
             return 0; /* no need to evaluate the rest */
         }
-        buf += consumed;
+        buf += h->is_avc ? nalsize : consumed;
     }
+    if (q264)
+        return 0;
     /* didn't find a picture! */
-    av_log(h->s.avctx, AV_LOG_ERROR, "missing picture in access unit\n");
+    av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
     return -1;
 }
 
@@ -239,13 +351,27 @@ static int h264_parse(AVCodecParserContext *s,
                       const uint8_t *buf, int buf_size)
 {
     H264Context *h = s->priv_data;
-    ParseContext *pc = &h->s.parse_context;
+    ParseContext *pc = &h->parse_context;
     int next;
 
+    if (!h->got_first) {
+        h->got_first = 1;
+        if (avctx->extradata_size) {
+            h->avctx = avctx;
+            // must be done like in decoder, otherwise opening the parser,
+            // letting it create extradata and then closing and opening again
+            // will cause has_b_frames to be always set.
+            // Note that estimate_timings_from_pts does exactly this.
+            if (!avctx->has_b_frames)
+                h->low_delay = 1;
+            ff_h264_decode_extradata(h, avctx->extradata, avctx->extradata_size);
+        }
+    }
+
     if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
         next= buf_size;
     }else{
-        next= ff_h264_find_frame_end(h, buf, buf_size);
+        next = h264_find_frame_end(h, buf, buf_size);
 
         if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
             *poutbuf = NULL;
@@ -254,21 +380,25 @@ static int h264_parse(AVCodecParserContext *s,
         }
 
         if(next<0 && next != END_NOT_FOUND){
-            assert(pc->last_index + next >= 0 );
-            ff_h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); //update state
+            av_assert1(pc->last_index + next >= 0 );
+            h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); // update state
         }
+    }
 
-        parse_nal_units(s, avctx, buf, buf_size);
+    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;
-        }
+    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;
+    }
+
+    if (s->flags & PARSER_FLAG_ONCE) {
+        s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
     }
 
     *poutbuf = buf;
@@ -303,18 +433,25 @@ static int h264_split(AVCodecContext *avctx,
 static void close(AVCodecParserContext *s)
 {
     H264Context *h = s->priv_data;
-    ParseContext *pc = &h->s.parse_context;
+    ParseContext *pc = &h->parse_context;
 
     av_free(pc->buffer);
     ff_h264_free_context(h);
 }
 
+static av_cold int init(AVCodecParserContext *s)
+{
+    H264Context *h = s->priv_data;
+    h->thread_context[0] = h;
+    h->slice_context_count = 1;
+    return 0;
+}
 
-AVCodecParser h264_parser = {
-    CODEC_ID_H264 },
-    sizeof(H264Context),
-    NULL,
-    h264_parse,
-    close,
-    h264_split,
+AVCodecParser ff_h264_parser = {
+    .codec_ids      = { AV_CODEC_ID_H264 },
+    .priv_data_size = sizeof(H264Context),
+    .parser_init    = init,
+    .parser_parse   = h264_parse,
+    .parser_close   = close,
+    .split          = h264_split,
 };