[libav.git] / libavcodec / h264_parser.c

/*
 * H.26L/H.264/AVC/JVT/14496-10/... parser
 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; 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>
 */

#include "parser.h"
#include "h264data.h"
#include "golomb.h"

#include <assert.h>


static int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
{
    int i;
    uint32_t state;
    ParseContext *pc = &(h->s.parse_context);
//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
//    mb_addr= pc->mb_addr - 1;
    state= pc->state;
    if(state>13)
        state= 7;

    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;
                    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){
                if(pc->frame_start_found){
                    state+=8;
                    continue;
                }else
                    pc->frame_start_found = 1;
            }
            state= 7;
        }else{
            if(buf[i] & 0x80)
                goto found;
            state= 7;
        }
    }
    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 = AV_PICTURE_TYPE_I;
    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;

    if (!buf_size)
        return 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 = 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;
            }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,
                      AVCodecContext *avctx,
                      const uint8_t **poutbuf, int *poutbuf_size,
                      const uint8_t *buf, int buf_size)
{
    H264Context *h = s->priv_data;
    ParseContext *pc = &h->s.parse_context;
    int next;

    if (!h->got_first) {
        h->got_first = 1;
        if (avctx->extradata_size) {
            h->s.avctx = avctx;
            ff_h264_decode_extradata(h);
        }
    }

    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){
            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;
        }
        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->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 ff_h264_parser = {
    { CODEC_ID_H264 },
    sizeof(H264Context),
    init,
    h264_parse,
    close,
    h264_split,
};
Commit	Line	Data
26b4fe82 AJ	1	/*
	2	* H.26L/H.264/AVC/JVT/14496-10/... parser
	3	* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
	4	*
2912e87a	5	* This file is part of Libav.
26b4fe82	6	*
2912e87a	7	* Libav is free software; you can redistribute it and/or
26b4fe82 AJ	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
2912e87a	12	* Libav is distributed in the hope that it will be useful,
26b4fe82 AJ	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
2912e87a	18	* License along with Libav; if not, write to the Free Software
26b4fe82	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26b4fe82 AJ	20	*/
	21
	22	/**
ba87f080	23	* @file
26b4fe82 AJ	24	* H.264 / AVC / MPEG4 part10 parser.
	25	* @author Michael Niedermayer <michaelni@gmx.at>
	26	*/
	27
	28	#include "parser.h"
ff6474dd IS	29	#include "h264data.h"
ff6474dd IS	30	#include "golomb.h"
26b4fe82 AJ	31
	32	#include <assert.h>
	33
	34
13eb6b90	35	static int ff_h264_find_frame_end(H264Context h, const uint8_t buf, int buf_size)
26b4fe82 AJ	36	{
	37	int i;
	38	uint32_t state;
	39	ParseContext *pc = &(h->s.parse_context);
	40	//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
	41	// mb_addr= pc->mb_addr - 1;
	42	state= pc->state;
	43	if(state>13)
	44	state= 7;
	45
	46	for(i=0; i<buf_size; i++){
	47	if(state==7){
b250f9c6	48	#if HAVE_FAST_UNALIGNED
e4f1ec3a MN	49	/* we check i<buf_size instead of i+3/7 because its simpler
	50	* and there should be FF_INPUT_BUFFER_PADDING_SIZE bytes at the end
	51	*/
b250f9c6	52	# if HAVE_FAST_64BIT
4d8eb2e8	53	while(i<buf_size && !((~(const uint64_t)(buf+i) & ((const uint64_t)(buf+i) - 0x0101010101010101ULL)) & 0x8080808080808080ULL))
5cb5023c MN	54	i+=8;
5cb5023c MN	55	# else
4d8eb2e8	56	while(i<buf_size && !((~(const uint32_t)(buf+i) & ((const uint32_t)(buf+i) - 0x01010101U)) & 0x80808080U))
5cb5023c MN	57	i+=4;
	58	# endif
	59	#endif
26b4fe82 AJ	60	for(; i<buf_size; i++){
	61	if(!buf[i]){
	62	state=2;
	63	break;
	64	}
	65	}
	66	}else if(state<=2){
	67	if(buf[i]==1) state^= 5; //2->7, 1->4, 0->5
	68	else if(buf[i]) state = 7;
	69	else state>>=1; //2->1, 1->0, 0->0
	70	}else if(state<=5){
	71	int v= buf[i] & 0x1F;
9e85f9c5	72	if(v==6 \|\| v==7 \|\| v==8 \|\| v==9){
26b4fe82 AJ	73	if(pc->frame_start_found){
26b4fe82 AJ	74	i++;
9aa1cfec	75	goto found;
26b4fe82 AJ	76	}
	77	}else if(v==1 \|\| v==2 \|\| v==5){
	78	if(pc->frame_start_found){
	79	state+=8;
	80	continue;
	81	}else
	82	pc->frame_start_found = 1;
	83	}
	84	state= 7;
	85	}else{
	86	if(buf[i] & 0x80)
	87	goto found;
	88	state= 7;
	89	}
	90	}
	91	pc->state= state;
	92	return END_NOT_FOUND;
9aa1cfec DP	93
	94	found:
	95	pc->state=7;
	96	pc->frame_start_found= 0;
	97	return i-(state&5);
26b4fe82 AJ	98	}
26b4fe82 AJ	99
ff6474dd IS	100	/*!
	101	* Parse NAL units of found picture and decode some basic information.
	102	*
	103	* @param s parser context.
	104	* @param avctx codec context.
	105	* @param buf buffer with field/frame data.
	106	* @param buf_size size of the buffer.
	107	*/
	108	static inline int parse_nal_units(AVCodecParserContext *s,
	109	AVCodecContext *avctx,
	110	const uint8_t *buf, int buf_size)
	111	{
	112	H264Context *h = s->priv_data;
	113	const uint8_t *buf_end = buf + buf_size;
96c3da93	114	unsigned int pps_id;
ff6474dd	115	unsigned int slice_type;
8fa0ae06	116	int state = -1;
ff6474dd IS	117	const uint8_t *ptr;
	118
	119	/* set some sane default values */
975a1447	120	s->pict_type = AV_PICTURE_TYPE_I;
0ed260c7	121	s->key_frame = 0;
ff6474dd IS	122
ff6474dd IS	123	h->s.avctx= avctx;
0ed260c7	124	h->sei_recovery_frame_cnt = -1;
c733922e IS	125	h->sei_dpb_output_delay = 0;
	126	h->sei_cpb_removal_delay = -1;
	127	h->sei_buffering_period_present = 0;
ff6474dd	128
9479415e BC	129	if (!buf_size)
	130	return 0;
	131
ff6474dd IS	132	for(;;) {
	133	int src_length, dst_length, consumed;
	134	buf = ff_find_start_code(buf, buf_end, &state);
	135	if(buf >= buf_end)
	136	break;
	137	--buf;
	138	src_length = buf_end - buf;
	139	switch (state & 0x1f) {
	140	case NAL_SLICE:
	141	case NAL_IDR_SLICE:
	142	// Do not walk the whole buffer just to decode slice header
	143	if (src_length > 20)
	144	src_length = 20;
	145	break;
	146	}
	147	ptr= ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length);
	148	if (ptr==NULL \|\| dst_length < 0)
	149	break;
	150
	151	init_get_bits(&h->s.gb, ptr, 8*dst_length);
	152	switch(h->nal_unit_type) {
	153	case NAL_SPS:
	154	ff_h264_decode_seq_parameter_set(h);
	155	break;
	156	case NAL_PPS:
	157	ff_h264_decode_picture_parameter_set(h, h->s.gb.size_in_bits);
	158	break;
	159	case NAL_SEI:
	160	ff_h264_decode_sei(h);
	161	break;
	162	case NAL_IDR_SLICE:
0ed260c7 IS	163	s->key_frame = 1;
0ed260c7 IS	164	/* fall through */
ff6474dd IS	165	case NAL_SLICE:
	166	get_ue_golomb(&h->s.gb); // skip first_mb_in_slice
	167	slice_type = get_ue_golomb_31(&h->s.gb);
	168	s->pict_type = golomb_to_pict_type[slice_type % 5];
0ed260c7 IS	169	if (h->sei_recovery_frame_cnt >= 0) {
	170	/* key frame, since recovery_frame_cnt is set */
	171	s->key_frame = 1;
	172	}
96c3da93 IS	173	pps_id= get_ue_golomb(&h->s.gb);
	174	if(pps_id>=MAX_PPS_COUNT) {
	175	av_log(h->s.avctx, AV_LOG_ERROR, "pps_id out of range\n");
	176	return -1;
	177	}
	178	if(!h->pps_buffers[pps_id]) {
	179	av_log(h->s.avctx, AV_LOG_ERROR, "non-existing PPS referenced\n");
	180	return -1;
	181	}
	182	h->pps= *h->pps_buffers[pps_id];
	183	if(!h->sps_buffers[h->pps.sps_id]) {
	184	av_log(h->s.avctx, AV_LOG_ERROR, "non-existing SPS referenced\n");
	185	return -1;
	186	}
	187	h->sps = *h->sps_buffers[h->pps.sps_id];
	188	h->frame_num = get_bits(&h->s.gb, h->sps.log2_max_frame_num);
	189
fe9a3fbe	190	avctx->profile = ff_h264_get_profile(&h->sps);
dd0cd3d2 RC	191	avctx->level = h->sps.level_idc;
dd0cd3d2 RC	192
96c3da93 IS	193	if(h->sps.frame_mbs_only_flag){
	194	h->s.picture_structure= PICT_FRAME;
	195	}else{
	196	if(get_bits1(&h->s.gb)) { //field_pic_flag
	197	h->s.picture_structure= PICT_TOP_FIELD + get_bits1(&h->s.gb); //bottom_field_flag
	198	} else {
	199	h->s.picture_structure= PICT_FRAME;
	200	}
	201	}
	202
346db3ef IS	203	if(h->sps.pic_struct_present_flag) {
	204	switch (h->sei_pic_struct) {
	205	case SEI_PIC_STRUCT_TOP_FIELD:
	206	case SEI_PIC_STRUCT_BOTTOM_FIELD:
fc9fe428	207	s->repeat_pict = 0;
346db3ef IS	208	break;
	209	case SEI_PIC_STRUCT_FRAME:
	210	case SEI_PIC_STRUCT_TOP_BOTTOM:
	211	case SEI_PIC_STRUCT_BOTTOM_TOP:
fc9fe428	212	s->repeat_pict = 1;
346db3ef IS	213	break;
	214	case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
	215	case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
fc9fe428	216	s->repeat_pict = 2;
346db3ef IS	217	break;
346db3ef IS	218	case SEI_PIC_STRUCT_FRAME_DOUBLING:
fc9fe428	219	s->repeat_pict = 3;
346db3ef IS	220	break;
346db3ef IS	221	case SEI_PIC_STRUCT_FRAME_TRIPLING:
fc9fe428	222	s->repeat_pict = 5;
346db3ef IS	223	break;
346db3ef IS	224	default:
fc9fe428	225	s->repeat_pict = h->s.picture_structure == PICT_FRAME ? 1 : 0;
346db3ef IS	226	break;
	227	}
	228	} else {
fc9fe428	229	s->repeat_pict = h->s.picture_structure == PICT_FRAME ? 1 : 0;
346db3ef IS	230	}
346db3ef IS	231
ff6474dd IS	232	return 0; /* no need to evaluate the rest */
	233	}
	234	buf += consumed;
	235	}
	236	/* didn't find a picture! */
	237	av_log(h->s.avctx, AV_LOG_ERROR, "missing picture in access unit\n");
	238	return -1;
	239	}
	240
26b4fe82 AJ	241	static int h264_parse(AVCodecParserContext *s,
	242	AVCodecContext *avctx,
	243	const uint8_t *poutbuf, int poutbuf_size,
	244	const uint8_t *buf, int buf_size)
	245	{
	246	H264Context *h = s->priv_data;
	247	ParseContext *pc = &h->s.parse_context;
	248	int next;
	249
82f1ffc7 HC	250	if (!h->got_first) {
82f1ffc7 HC	251	h->got_first = 1;
23584bec HC	252	if (avctx->extradata_size) {
	253	h->s.avctx = avctx;
	254	ff_h264_decode_extradata(h);
	255	}
	256	}
	257
26b4fe82 AJ	258	if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
	259	next= buf_size;
	260	}else{
	261	next= ff_h264_find_frame_end(h, buf, buf_size);
	262
	263	if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
	264	*poutbuf = NULL;
	265	*poutbuf_size = 0;
	266	return buf_size;
	267	}
	268
	269	if(next<0 && next != END_NOT_FOUND){
	270	assert(pc->last_index + next >= 0 );
	271	ff_h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); //update state
	272	}
a26ce1e2	273	}
ff6474dd IS	274
ff6474dd IS	275	parse_nal_units(s, avctx, buf, buf_size);
c733922e	276
2c0c5e12	277	if (h->sei_cpb_removal_delay >= 0) {
26aedb4a CEH	278	s->dts_sync_point = h->sei_buffering_period_present;
	279	s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
	280	s->pts_dts_delta = h->sei_dpb_output_delay;
2c0c5e12 IS	281	} else {
	282	s->dts_sync_point = INT_MIN;
	283	s->dts_ref_dts_delta = INT_MIN;
	284	s->pts_dts_delta = INT_MIN;
	285	}
74a6df59 AC	286	if (s->flags & PARSER_FLAG_ONCE) {
	287	s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
	288	}
26b4fe82 AJ	289
	290	*poutbuf = buf;
	291	*poutbuf_size = buf_size;
	292	return next;
	293	}
	294
	295	static int h264_split(AVCodecContext *avctx,
	296	const uint8_t *buf, int buf_size)
	297	{
	298	int i;
	299	uint32_t state = -1;
	300	int has_sps= 0;
	301
	302	for(i=0; i<=buf_size; i++){
	303	if((state&0xFFFFFF1F) == 0x107)
	304	has_sps=1;
	305	/* if((state&0xFFFFFF1F) == 0x101 \|\| (state&0xFFFFFF1F) == 0x102 \|\| (state&0xFFFFFF1F) == 0x105){
	306	}*/
	307	if((state&0xFFFFFF00) == 0x100 && (state&0xFFFFFF1F) != 0x107 && (state&0xFFFFFF1F) != 0x108 && (state&0xFFFFFF1F) != 0x109){
	308	if(has_sps){
	309	while(i>4 && buf[i-5]==0) i--;
	310	return i-4;
	311	}
	312	}
	313	if (i<buf_size)
	314	state= (state<<8) \| buf[i];
	315	}
	316	return 0;
	317	}
	318
dd990075	319	static void close(AVCodecParserContext *s)
3ee4f5e4 MN	320	{
	321	H264Context *h = s->priv_data;
	322	ParseContext *pc = &h->s.parse_context;
	323
	324	av_free(pc->buffer);
15861962	325	ff_h264_free_context(h);
3ee4f5e4 MN	326	}
3ee4f5e4 MN	327
e9ca315d RC	328	static int init(AVCodecParserContext *s)
	329	{
	330	H264Context *h = s->priv_data;
	331	h->thread_context[0] = h;
	332	return 0;
	333	}
26b4fe82	334
d36beb3f	335	AVCodecParser ff_h264_parser = {
0d3d172f	336	{ CODEC_ID_H264 },
26b4fe82	337	sizeof(H264Context),
e9ca315d	338	init,
26b4fe82	339	h264_parse,
3ee4f5e4	340	close,
26b4fe82 AJ	341	h264_split,
26b4fe82 AJ	342	};