making act segmenter

1 files changed, 398 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/h264_parser.c b/ffmpeg/libavcodec/h264_parser.c
new file mode 100644
index 0000000..44b92b7
--- /dev/null
+++ b/ffmpeg/libavcodec/h264_parser.c
@@ -0,0 +1,398 @@
+/*
+ * H.26L/H.264/AVC/JVT/14496-10/... parser
+ * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * H.264 / AVC / MPEG4 part10 parser.
+ * @author Michael Niedermayer <michaelni@gmx.at>
+ */
+
+#define UNCHECKED_BITSTREAM_READER 1
+
+#include "parser.h"
+#include "h264data.h"
+#include "golomb.h"
+
+
+static int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
+{
+    int i, j;
+    uint32_t state;
+    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<next_avc && !((~*(const uint64_t*)(buf+i) & (*(const uint64_t*)(buf+i) - 0x0101010101010101ULL)) & 0x8080808080808080ULL))
+                i+=8;
+#    else
+            while(i<next_avc && !((~*(const uint32_t*)(buf+i) & (*(const uint32_t*)(buf+i) - 0x01010101U)) & 0x80808080U))
+                i+=4;
+#    endif
+#endif
+            for(; i<next_avc; i++){
+                if(!buf[i]){
+                    state=2;
+                    break;
+                }
+            }
+        }else if(state<=2){
+            if(buf[i]==1)   state^= 5; //2->7, 1->4, 0->5
+            else if(buf[i]) state = 7;
+            else            state>>=1; //2->1, 1->0, 0->0
+        }else if(state<=5){
+            int v= buf[i] & 0x1F;
+            if(v==6 || v==7 || v==8 || v==9){
+                if(pc->frame_start_found){
+                    i++;
+                    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){
+                    if(mb <= last_mb)
+                        goto found;
+                }else
+                    pc->frame_start_found = 1;
+                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;
+    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.
+ * @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;
+    int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
+
+    /* set some sane default values */
+    s->pict_type = AV_PICTURE_TYPE_I;
+    s->key_frame = 0;
+
+    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, 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_mpv_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->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->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_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->gb);
+            if(pps_id>=MAX_PPS_COUNT) {
+                av_log(h->avctx, AV_LOG_ERROR, "pps_id out of range\n");
+                return -1;
+            }
+            if(!h->pps_buffers[pps_id]) {
+                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->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->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->picture_structure= PICT_FRAME;
+            }else{
+                if(get_bits1(&h->gb)) { //field_pic_flag
+                    h->picture_structure= PICT_TOP_FIELD + get_bits1(&h->gb); //bottom_field_flag
+                } else {
+                    h->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->picture_structure == PICT_FRAME ? 1 : 0;
+                        break;
+                }
+            } else {
+                s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
+            }
+
+            return 0; /* no need to evaluate the rest */
+        }
+        buf += h->is_avc ? nalsize : consumed;
+    }
+    if (q264)
+        return 0;
+    /* didn't find a picture! */
+    av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
+    return -1;
+}
+
+static int h264_parse(AVCodecParserContext *s,
+                      AVCodecContext *avctx,
+                      const uint8_t **poutbuf, int *poutbuf_size,
+                      const uint8_t *buf, int buf_size)
+{
+    H264Context *h = s->priv_data;
+    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);
+
+        if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
+            *poutbuf = NULL;
+            *poutbuf_size = 0;
+            return buf_size;
+        }
+
+        if(next<0 && next != END_NOT_FOUND){
+            av_assert1(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;
+    }
+
+    if (s->flags & PARSER_FLAG_ONCE) {
+        s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
+    }
+
+    *poutbuf = buf;
+    *poutbuf_size = buf_size;
+    return next;
+}
+
+static int h264_split(AVCodecContext *avctx,
+                      const uint8_t *buf, int buf_size)
+{
+    int i;
+    uint32_t state = -1;
+    int has_sps= 0;
+
+    for(i=0; i<=buf_size; i++){
+        if((state&0xFFFFFF1F) == 0x107)
+            has_sps=1;
+/*        if((state&0xFFFFFF1F) == 0x101 || (state&0xFFFFFF1F) == 0x102 || (state&0xFFFFFF1F) == 0x105){
+        }*/
+        if((state&0xFFFFFF00) == 0x100 && (state&0xFFFFFF1F) != 0x107 && (state&0xFFFFFF1F) != 0x108 && (state&0xFFFFFF1F) != 0x109){
+            if(has_sps){
+                while(i>4 && buf[i-5]==0) i--;
+                return i-4;
+            }
+        }
+        if (i<buf_size)
+            state= (state<<8) | buf[i];
+    }
+    return 0;
+}
+
+static void close(AVCodecParserContext *s)
+{
+    H264Context *h = s->priv_data;
+    ParseContext *pc = &h->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;
+    h->slice_context_count = 1;
+    return 0;
+}
+
+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,
+};