[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 "libavutil/attributes.h"
#include "parser.h"
#include "h264data.h"
#include "golomb.h"
#include "internal.h"

#include <assert.h>


static int h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
{
    int i;
    uint32_t state;
    ParseContext *pc = &h->parse_context;
//    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->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 = 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:
            // 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(&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 += consumed;
    }
    /* didn't find a picture! */
    av_log(h->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->parse_context;
    int next;

    if (!h->got_first) {
        h->got_first = 1;
        if (avctx->extradata_size) {
            h->avctx = avctx;
            // must be done like in the decoder.
            // otherwise opening the parser, creating extradata,
            // and then closing and opening again
            // will cause has_b_frames to be always set.
            // NB: estimate_timings_from_pts behaves exactly like this.
            if (!avctx->has_b_frames)
                h->low_delay = 1;
            ff_h264_decode_extradata(h);
        }
    }

    if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
        next= buf_size;
    }else{
        next = 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 );
            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 av_cold 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,
};
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
6fee1b90	28	#include "libavutil/attributes.h"
26b4fe82	29	#include "parser.h"
ff6474dd IS	30	#include "h264data.h"
ff6474dd IS	31	#include "golomb.h"
f1e93986	32	#include "internal.h"
26b4fe82 AJ	33
	34	#include <assert.h>
	35
	36
088f38a4	37	static int h264_find_frame_end(H264Context h, const uint8_t buf, int buf_size)
26b4fe82 AJ	38	{
	39	int i;
	40	uint32_t state;
2c541554	41	ParseContext *pc = &h->parse_context;
26b4fe82 AJ	42	// mb_addr= pc->mb_addr - 1;
	43	state= pc->state;
	44	if(state>13)
	45	state= 7;
	46
	47	for(i=0; i<buf_size; i++){
	48	if(state==7){
b250f9c6	49	#if HAVE_FAST_UNALIGNED
e4f1ec3a MN	50	/* we check i<buf_size instead of i+3/7 because its simpler
	51	* and there should be FF_INPUT_BUFFER_PADDING_SIZE bytes at the end
	52	*/
b250f9c6	53	# if HAVE_FAST_64BIT
4d8eb2e8	54	while(i<buf_size && !((~(const uint64_t)(buf+i) & ((const uint64_t)(buf+i) - 0x0101010101010101ULL)) & 0x8080808080808080ULL))
5cb5023c MN	55	i+=8;
5cb5023c MN	56	# else
4d8eb2e8	57	while(i<buf_size && !((~(const uint32_t)(buf+i) & ((const uint32_t)(buf+i) - 0x01010101U)) & 0x80808080U))
5cb5023c MN	58	i+=4;
	59	# endif
	60	#endif
26b4fe82 AJ	61	for(; i<buf_size; i++){
	62	if(!buf[i]){
	63	state=2;
	64	break;
	65	}
	66	}
	67	}else if(state<=2){
	68	if(buf[i]==1) state^= 5; //2->7, 1->4, 0->5
	69	else if(buf[i]) state = 7;
	70	else state>>=1; //2->1, 1->0, 0->0
	71	}else if(state<=5){
	72	int v= buf[i] & 0x1F;
9e85f9c5	73	if(v==6 \|\| v==7 \|\| v==8 \|\| v==9){
26b4fe82 AJ	74	if(pc->frame_start_found){
26b4fe82 AJ	75	i++;
9aa1cfec	76	goto found;
26b4fe82 AJ	77	}
	78	}else if(v==1 \|\| v==2 \|\| v==5){
	79	if(pc->frame_start_found){
	80	state+=8;
	81	continue;
	82	}else
	83	pc->frame_start_found = 1;
	84	}
	85	state= 7;
	86	}else{
	87	if(buf[i] & 0x80)
	88	goto found;
	89	state= 7;
	90	}
	91	}
	92	pc->state= state;
	93	return END_NOT_FOUND;
9aa1cfec DP	94
	95	found:
	96	pc->state=7;
	97	pc->frame_start_found= 0;
	98	return i-(state&5);
26b4fe82 AJ	99	}
26b4fe82 AJ	100
adbfc605	101	/**
ff6474dd IS	102	* Parse NAL units of found picture and decode some basic information.
	103	*
	104	* @param s parser context.
	105	* @param avctx codec context.
	106	* @param buf buffer with field/frame data.
	107	* @param buf_size size of the buffer.
	108	*/
	109	static inline int parse_nal_units(AVCodecParserContext *s,
	110	AVCodecContext *avctx,
	111	const uint8_t *buf, int buf_size)
	112	{
	113	H264Context *h = s->priv_data;
	114	const uint8_t *buf_end = buf + buf_size;
96c3da93	115	unsigned int pps_id;
ff6474dd	116	unsigned int slice_type;
8fa0ae06	117	int state = -1;
ff6474dd IS	118	const uint8_t *ptr;
	119
	120	/* set some sane default values */
975a1447	121	s->pict_type = AV_PICTURE_TYPE_I;
0ed260c7	122	s->key_frame = 0;
ff6474dd	123
2c541554	124	h->avctx= avctx;
0ed260c7	125	h->sei_recovery_frame_cnt = -1;
c733922e IS	126	h->sei_dpb_output_delay = 0;
	127	h->sei_cpb_removal_delay = -1;
	128	h->sei_buffering_period_present = 0;
ff6474dd	129
9479415e BC	130	if (!buf_size)
	131	return 0;
	132
ff6474dd IS	133	for(;;) {
ff6474dd IS	134	int src_length, dst_length, consumed;
f1e93986	135	buf = avpriv_find_start_code(buf, buf_end, &state);
ff6474dd IS	136	if(buf >= buf_end)
	137	break;
	138	--buf;
	139	src_length = buf_end - buf;
	140	switch (state & 0x1f) {
	141	case NAL_SLICE:
	142	case NAL_IDR_SLICE:
	143	// Do not walk the whole buffer just to decode slice header
	144	if (src_length > 20)
	145	src_length = 20;
	146	break;
	147	}
358ea75e	148	ptr= ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length);
ff6474dd IS	149	if (ptr==NULL \|\| dst_length < 0)
	150	break;
	151
2c541554	152	init_get_bits(&h->gb, ptr, 8*dst_length);
ff6474dd IS	153	switch(h->nal_unit_type) {
	154	case NAL_SPS:
	155	ff_h264_decode_seq_parameter_set(h);
	156	break;
	157	case NAL_PPS:
2c541554	158	ff_h264_decode_picture_parameter_set(h, h->gb.size_in_bits);
ff6474dd IS	159	break;
	160	case NAL_SEI:
	161	ff_h264_decode_sei(h);
	162	break;
	163	case NAL_IDR_SLICE:
0ed260c7 IS	164	s->key_frame = 1;
0ed260c7 IS	165	/* fall through */
ff6474dd	166	case NAL_SLICE:
2c541554 AK	167	get_ue_golomb(&h->gb); // skip first_mb_in_slice
2c541554 AK	168	slice_type = get_ue_golomb_31(&h->gb);
ff6474dd	169	s->pict_type = golomb_to_pict_type[slice_type % 5];
0ed260c7 IS	170	if (h->sei_recovery_frame_cnt >= 0) {
	171	/* key frame, since recovery_frame_cnt is set */
	172	s->key_frame = 1;
	173	}
2c541554	174	pps_id= get_ue_golomb(&h->gb);
96c3da93	175	if(pps_id>=MAX_PPS_COUNT) {
2c541554	176	av_log(h->avctx, AV_LOG_ERROR, "pps_id out of range\n");
96c3da93 IS	177	return -1;
	178	}
	179	if(!h->pps_buffers[pps_id]) {
2c541554	180	av_log(h->avctx, AV_LOG_ERROR, "non-existing PPS referenced\n");
96c3da93 IS	181	return -1;
	182	}
	183	h->pps= *h->pps_buffers[pps_id];
	184	if(!h->sps_buffers[h->pps.sps_id]) {
2c541554	185	av_log(h->avctx, AV_LOG_ERROR, "non-existing SPS referenced\n");
96c3da93 IS	186	return -1;
	187	}
	188	h->sps = *h->sps_buffers[h->pps.sps_id];
2c541554	189	h->frame_num = get_bits(&h->gb, h->sps.log2_max_frame_num);
96c3da93	190
fe9a3fbe	191	avctx->profile = ff_h264_get_profile(&h->sps);
dd0cd3d2 RC	192	avctx->level = h->sps.level_idc;
dd0cd3d2 RC	193
96c3da93	194	if(h->sps.frame_mbs_only_flag){
2c541554	195	h->picture_structure= PICT_FRAME;
96c3da93	196	}else{
2c541554 AK	197	if(get_bits1(&h->gb)) { //field_pic_flag
2c541554 AK	198	h->picture_structure= PICT_TOP_FIELD + get_bits1(&h->gb); //bottom_field_flag
96c3da93	199	} else {
2c541554	200	h->picture_structure= PICT_FRAME;
96c3da93 IS	201	}
	202	}
	203
346db3ef IS	204	if(h->sps.pic_struct_present_flag) {
	205	switch (h->sei_pic_struct) {
	206	case SEI_PIC_STRUCT_TOP_FIELD:
	207	case SEI_PIC_STRUCT_BOTTOM_FIELD:
fc9fe428	208	s->repeat_pict = 0;
346db3ef IS	209	break;
	210	case SEI_PIC_STRUCT_FRAME:
	211	case SEI_PIC_STRUCT_TOP_BOTTOM:
	212	case SEI_PIC_STRUCT_BOTTOM_TOP:
fc9fe428	213	s->repeat_pict = 1;
346db3ef IS	214	break;
	215	case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
	216	case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
fc9fe428	217	s->repeat_pict = 2;
346db3ef IS	218	break;
346db3ef IS	219	case SEI_PIC_STRUCT_FRAME_DOUBLING:
fc9fe428	220	s->repeat_pict = 3;
346db3ef IS	221	break;
346db3ef IS	222	case SEI_PIC_STRUCT_FRAME_TRIPLING:
fc9fe428	223	s->repeat_pict = 5;
346db3ef IS	224	break;
346db3ef IS	225	default:
2c541554	226	s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
346db3ef IS	227	break;
	228	}
	229	} else {
2c541554	230	s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
346db3ef IS	231	}
346db3ef IS	232
ff6474dd IS	233	return 0; /* no need to evaluate the rest */
	234	}
	235	buf += consumed;
	236	}
	237	/* didn't find a picture! */
2c541554	238	av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit\n");
ff6474dd IS	239	return -1;
	240	}
	241
26b4fe82 AJ	242	static int h264_parse(AVCodecParserContext *s,
	243	AVCodecContext *avctx,
	244	const uint8_t *poutbuf, int poutbuf_size,
	245	const uint8_t *buf, int buf_size)
	246	{
	247	H264Context *h = s->priv_data;
2c541554	248	ParseContext *pc = &h->parse_context;
26b4fe82 AJ	249	int next;
26b4fe82 AJ	250
82f1ffc7 HC	251	if (!h->got_first) {
82f1ffc7 HC	252	h->got_first = 1;
23584bec	253	if (avctx->extradata_size) {
2c541554	254	h->avctx = avctx;
790a367d RT	255	// must be done like in the decoder.
	256	// otherwise opening the parser, creating extradata,
	257	// and then closing and opening again
	258	// will cause has_b_frames to be always set.
	259	// NB: estimate_timings_from_pts behaves exactly like this.
	260	if (!avctx->has_b_frames)
2c541554	261	h->low_delay = 1;
23584bec HC	262	ff_h264_decode_extradata(h);
	263	}
	264	}
	265
26b4fe82 AJ	266	if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
	267	next= buf_size;
	268	}else{
088f38a4	269	next = h264_find_frame_end(h, buf, buf_size);
26b4fe82 AJ	270
	271	if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
	272	*poutbuf = NULL;
	273	*poutbuf_size = 0;
	274	return buf_size;
	275	}
	276
	277	if(next<0 && next != END_NOT_FOUND){
	278	assert(pc->last_index + next >= 0 );
088f38a4	279	h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); // update state
26b4fe82	280	}
a26ce1e2	281	}
ff6474dd	282
25f05ddb	283	parse_nal_units(s, avctx, buf, buf_size);
c733922e	284
25f05ddb PL	285	if (h->sei_cpb_removal_delay >= 0) {
	286	s->dts_sync_point = h->sei_buffering_period_present;
	287	s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
	288	s->pts_dts_delta = h->sei_dpb_output_delay;
	289	} else {
	290	s->dts_sync_point = INT_MIN;
	291	s->dts_ref_dts_delta = INT_MIN;
	292	s->pts_dts_delta = INT_MIN;
	293	}
	294
	295	if (s->flags & PARSER_FLAG_ONCE) {
	296	s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
	297	}
26b4fe82 AJ	298
	299	*poutbuf = buf;
	300	*poutbuf_size = buf_size;
	301	return next;
	302	}
	303
	304	static int h264_split(AVCodecContext *avctx,
	305	const uint8_t *buf, int buf_size)
	306	{
	307	int i;
	308	uint32_t state = -1;
	309	int has_sps= 0;
	310
	311	for(i=0; i<=buf_size; i++){
	312	if((state&0xFFFFFF1F) == 0x107)
	313	has_sps=1;
	314	/* if((state&0xFFFFFF1F) == 0x101 \|\| (state&0xFFFFFF1F) == 0x102 \|\| (state&0xFFFFFF1F) == 0x105){
	315	}*/
	316	if((state&0xFFFFFF00) == 0x100 && (state&0xFFFFFF1F) != 0x107 && (state&0xFFFFFF1F) != 0x108 && (state&0xFFFFFF1F) != 0x109){
	317	if(has_sps){
	318	while(i>4 && buf[i-5]==0) i--;
	319	return i-4;
	320	}
	321	}
	322	if (i<buf_size)
	323	state= (state<<8) \| buf[i];
	324	}
	325	return 0;
	326	}
	327
dd990075	328	static void close(AVCodecParserContext *s)
3ee4f5e4 MN	329	{
3ee4f5e4 MN	330	H264Context *h = s->priv_data;
2c541554	331	ParseContext *pc = &h->parse_context;
3ee4f5e4 MN	332
3ee4f5e4 MN	333	av_free(pc->buffer);
15861962	334	ff_h264_free_context(h);
3ee4f5e4 MN	335	}
3ee4f5e4 MN	336
6fee1b90	337	static av_cold int init(AVCodecParserContext *s)
e9ca315d RC	338	{
	339	H264Context *h = s->priv_data;
	340	h->thread_context[0] = h;
2c541554	341	h->slice_context_count = 1;
e9ca315d RC	342	return 0;
e9ca315d RC	343	}
26b4fe82	344
d36beb3f	345	AVCodecParser ff_h264_parser = {
36ef5369	346	.codec_ids = { AV_CODEC_ID_H264 },
5511ad14 AK	347	.priv_data_size = sizeof(H264Context),
	348	.parser_init = init,
	349	.parser_parse = h264_parse,
	350	.parser_close = close,
	351	.split = h264_split,
26b4fe82	352	};