[deb_ffmpeg.git] / ffmpeg / libavcodec / hevc_parser.c

/*
 * HEVC Annex B format parser
 *
 * Copyright (C) 2012 - 2013 Guillaume Martres
 *
 * 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
 */

#include "libavutil/common.h"

#include "parser.h"
#include "hevc.h"
#include "golomb.h"

#define START_CODE 0x000001 ///< start_code_prefix_one_3bytes

typedef struct HEVCParseContext {
    HEVCContext  h;
    ParseContext pc;
} HEVCParseContext;

/**
 * Find the end of the current frame in the bitstream.
 * @return the position of the first byte of the next frame, or END_NOT_FOUND
 */
static int hevc_find_frame_end(AVCodecParserContext *s, const uint8_t *buf,
                               int buf_size)
{
    int i;
    ParseContext *pc = &((HEVCParseContext *)s->priv_data)->pc;

    for (i = 0; i < buf_size; i++) {
        int nut;

        pc->state64 = (pc->state64 << 8) | buf[i];

        if (((pc->state64 >> 3 * 8) & 0xFFFFFF) != START_CODE)
            continue;

        nut = (pc->state64 >> 2 * 8 + 1) & 0x3F;
        // Beginning of access unit
        if ((nut >= NAL_VPS && nut <= NAL_AUD) || nut == NAL_SEI_PREFIX ||
            (nut >= 41 && nut <= 44) || (nut >= 48 && nut <= 55)) {
            if (pc->frame_start_found) {
                pc->frame_start_found = 0;
                return i - 5;
            }
        } else if (nut <= NAL_RASL_R ||
                   (nut >= NAL_BLA_W_LP && nut <= NAL_CRA_NUT)) {
            int first_slice_segment_in_pic_flag = buf[i] >> 7;
            if (first_slice_segment_in_pic_flag) {
                if (!pc->frame_start_found) {
                    pc->frame_start_found = 1;
                } else { // First slice of next frame found
                    pc->frame_start_found = 0;
                    return i - 5;
                }
            }
        }
    }

    return END_NOT_FOUND;
}

/**
 * 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)
{
    HEVCContext   *h  = &((HEVCParseContext *)s->priv_data)->h;
    GetBitContext *gb = &h->HEVClc->gb;
    SliceHeader   *sh = &h->sh;
    const uint8_t *buf_end = buf + buf_size;
    int state = -1, i;
    HEVCNAL *nal;

    /* set some sane default values */
    s->pict_type         = AV_PICTURE_TYPE_I;
    s->key_frame         = 0;
    s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;

    h->avctx = avctx;

    if (!buf_size)
        return 0;

    if (h->nals_allocated < 1) {
        HEVCNAL *tmp = av_realloc_array(h->nals, 1, sizeof(*tmp));
        if (!tmp)
            return AVERROR(ENOMEM);
        h->nals = tmp;
        memset(h->nals, 0, sizeof(*tmp));
        h->nals_allocated = 1;
    }

    nal = &h->nals[0];

    for (;;) {
        int src_length, consumed;
        buf = avpriv_find_start_code(buf, buf_end, &state);
        if (--buf + 2 >= buf_end)
            break;
        src_length = buf_end - buf;

        h->nal_unit_type = (*buf >> 1) & 0x3f;
        h->temporal_id   = (*(buf + 1) & 0x07) - 1;
        if (h->nal_unit_type <= NAL_CRA_NUT) {
            // Do not walk the whole buffer just to decode slice segment header
            if (src_length > 20)
                src_length = 20;
        }

        consumed = ff_hevc_extract_rbsp(h, buf, src_length, nal);
        if (consumed < 0)
            return consumed;

        init_get_bits8(gb, nal->data + 2, nal->size);
        switch (h->nal_unit_type) {
        case NAL_VPS:
            ff_hevc_decode_nal_vps(h);
            break;
        case NAL_SPS:
            ff_hevc_decode_nal_sps(h);
            break;
        case NAL_PPS:
            ff_hevc_decode_nal_pps(h);
            break;
        case NAL_SEI_PREFIX:
        case NAL_SEI_SUFFIX:
            ff_hevc_decode_nal_sei(h);
            break;
        case NAL_TRAIL_N:
        case NAL_TRAIL_R:
        case NAL_TSA_N:
        case NAL_TSA_R:
        case NAL_STSA_N:
        case NAL_STSA_R:
        case NAL_RADL_N:
        case NAL_RADL_R:
        case NAL_RASL_N:
        case NAL_RASL_R:
        case NAL_BLA_W_LP:
        case NAL_BLA_W_RADL:
        case NAL_BLA_N_LP:
        case NAL_IDR_W_RADL:
        case NAL_IDR_N_LP:
        case NAL_CRA_NUT:
            sh->first_slice_in_pic_flag = get_bits1(gb);
            s->picture_structure = h->picture_struct;
            s->field_order = h->picture_struct;

            if (IS_IRAP(h)) {
                s->key_frame = 1;
                sh->no_output_of_prior_pics_flag = get_bits1(gb);
            }

            sh->pps_id = get_ue_golomb(gb);
            if (sh->pps_id >= MAX_PPS_COUNT || !h->pps_list[sh->pps_id]) {
                av_log(h->avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", sh->pps_id);
                return AVERROR_INVALIDDATA;
            }
            h->pps = (HEVCPPS*)h->pps_list[sh->pps_id]->data;

            if (h->pps->sps_id >= MAX_SPS_COUNT || !h->sps_list[h->pps->sps_id]) {
                av_log(h->avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", h->pps->sps_id);
                return AVERROR_INVALIDDATA;
            }
            if (h->sps != (HEVCSPS*)h->sps_list[h->pps->sps_id]->data) {
                h->sps = (HEVCSPS*)h->sps_list[h->pps->sps_id]->data;
                h->vps = (HEVCVPS*)h->vps_list[h->sps->vps_id]->data;
            }

            if (!sh->first_slice_in_pic_flag) {
                int slice_address_length;

                if (h->pps->dependent_slice_segments_enabled_flag)
                    sh->dependent_slice_segment_flag = get_bits1(gb);
                else
                    sh->dependent_slice_segment_flag = 0;

                slice_address_length = av_ceil_log2_c(h->sps->ctb_width *
                                                      h->sps->ctb_height);
                sh->slice_segment_addr = get_bits(gb, slice_address_length);
                if (sh->slice_segment_addr >= h->sps->ctb_width * h->sps->ctb_height) {
                    av_log(h->avctx, AV_LOG_ERROR, "Invalid slice segment address: %u.\n",
                           sh->slice_segment_addr);
                    return AVERROR_INVALIDDATA;
                }
            } else
                sh->dependent_slice_segment_flag = 0;

            if (sh->dependent_slice_segment_flag)
                break;

            for (i = 0; i < h->pps->num_extra_slice_header_bits; i++)
                skip_bits(gb, 1); // slice_reserved_undetermined_flag[]

            sh->slice_type = get_ue_golomb(gb);
            if (!(sh->slice_type == I_SLICE || sh->slice_type == P_SLICE ||
                  sh->slice_type == B_SLICE)) {
                av_log(h->avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
                       sh->slice_type);
                return AVERROR_INVALIDDATA;
            }
            s->pict_type = sh->slice_type == B_SLICE ? AV_PICTURE_TYPE_B :
                           sh->slice_type == P_SLICE ? AV_PICTURE_TYPE_P :
                                                       AV_PICTURE_TYPE_I;

            if (h->pps->output_flag_present_flag)
                sh->pic_output_flag = get_bits1(gb);

            if (h->sps->separate_colour_plane_flag)
                sh->colour_plane_id = get_bits(gb, 2);

            if (!IS_IDR(h)) {
                sh->pic_order_cnt_lsb = get_bits(gb, h->sps->log2_max_poc_lsb);
                s->output_picture_number = h->poc = ff_hevc_compute_poc(h, sh->pic_order_cnt_lsb);
            } else
                s->output_picture_number = h->poc = 0;

            if (h->temporal_id == 0 &&
                h->nal_unit_type != NAL_TRAIL_N &&
                h->nal_unit_type != NAL_TSA_N &&
                h->nal_unit_type != NAL_STSA_N &&
                h->nal_unit_type != NAL_RADL_N &&
                h->nal_unit_type != NAL_RASL_N &&
                h->nal_unit_type != NAL_RADL_R &&
                h->nal_unit_type != NAL_RASL_R)
                h->pocTid0 = h->poc;

            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 hevc_parse(AVCodecParserContext *s,
                      AVCodecContext *avctx,
                      const uint8_t **poutbuf, int *poutbuf_size,
                      const uint8_t *buf, int buf_size)
{
    int next;
    ParseContext *pc = &((HEVCParseContext *)s->priv_data)->pc;

    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
        next = buf_size;
    } else {
        next = hevc_find_frame_end(s, buf, buf_size);
        if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
            *poutbuf      = NULL;
            *poutbuf_size = 0;
            return buf_size;
        }
    }

    parse_nal_units(s, avctx, buf, buf_size);

    *poutbuf      = buf;
    *poutbuf_size = buf_size;
    return next;
}

// Split after the parameter sets at the beginning of the stream if they exist.
static int hevc_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
{
    int i;
    uint32_t state = -1;
    int has_ps = 0;

    for (i = 0; i < buf_size; i++) {
        state = (state << 8) | buf[i];
        if (((state >> 8) & 0xFFFFFF) == START_CODE) {
            int nut = (state >> 1) & 0x3F;
            if (nut >= NAL_VPS && nut <= NAL_PPS)
                has_ps = 1;
            else if (has_ps)
                return i - 3;
            else // no parameter set at the beginning of the stream
                return 0;
        }
    }
    return 0;
}

static int hevc_init(AVCodecParserContext *s)
{
    HEVCContext  *h  = &((HEVCParseContext *)s->priv_data)->h;
    h->HEVClc = av_mallocz(sizeof(HEVCLocalContext));
    h->skipped_bytes_pos_size = INT_MAX;

    return 0;
}

static void hevc_close(AVCodecParserContext *s)
{
    int i;
    HEVCContext  *h  = &((HEVCParseContext *)s->priv_data)->h;
    ParseContext *pc = &((HEVCParseContext *)s->priv_data)->pc;

    av_freep(&h->skipped_bytes_pos);
    av_freep(&h->HEVClc);
    av_freep(&pc->buffer);

    for (i = 0; i < FF_ARRAY_ELEMS(h->vps_list); i++)
        av_buffer_unref(&h->vps_list[i]);
    for (i = 0; i < FF_ARRAY_ELEMS(h->sps_list); i++)
        av_buffer_unref(&h->sps_list[i]);
    for (i = 0; i < FF_ARRAY_ELEMS(h->pps_list); i++)
        av_buffer_unref(&h->pps_list[i]);

    av_buffer_unref(&h->current_sps);
    h->sps = NULL;

    for (i = 0; i < h->nals_allocated; i++)
        av_freep(&h->nals[i].rbsp_buffer);
    av_freep(&h->nals);
    h->nals_allocated = 0;
}

AVCodecParser ff_hevc_parser = {
    .codec_ids      = { AV_CODEC_ID_HEVC },
    .priv_data_size = sizeof(HEVCParseContext),
    .parser_init    = hevc_init,
    .parser_parse   = hevc_parse,
    .parser_close   = hevc_close,
    .split          = hevc_split,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* HEVC Annex B format parser
	3	*
	4	* Copyright (C) 2012 - 2013 Guillaume Martres
	5	*
	6	* This file is part of FFmpeg.
	7	*
	8	* FFmpeg is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2.1 of the License, or (at your option) any later version.
	12	*
	13	* FFmpeg is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with FFmpeg; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	#include "libavutil/common.h"
	24
	25	#include "parser.h"
	26	#include "hevc.h"
	27	#include "golomb.h"
	28
	29	#define START_CODE 0x000001 ///< start_code_prefix_one_3bytes
	30
	31	typedef struct HEVCParseContext {
	32	HEVCContext h;
	33	ParseContext pc;
	34	} HEVCParseContext;
	35
	36	/**
	37	* Find the end of the current frame in the bitstream.
	38	* @return the position of the first byte of the next frame, or END_NOT_FOUND
	39	*/
	40	static int hevc_find_frame_end(AVCodecParserContext s, const uint8_t buf,
	41	int buf_size)
	42	{
	43	int i;
	44	ParseContext pc = &((HEVCParseContext )s->priv_data)->pc;
	45
	46	for (i = 0; i < buf_size; i++) {
	47	int nut;
	48
	49	pc->state64 = (pc->state64 << 8) \| buf[i];
	50
	51	if (((pc->state64 >> 3 * 8) & 0xFFFFFF) != START_CODE)
	52	continue;
	53
	54	nut = (pc->state64 >> 2 * 8 + 1) & 0x3F;
	55	// Beginning of access unit
	56	if ((nut >= NAL_VPS && nut <= NAL_AUD) \|\| nut == NAL_SEI_PREFIX \|\|
	57	(nut >= 41 && nut <= 44) \|\| (nut >= 48 && nut <= 55)) {
	58	if (pc->frame_start_found) {
	59	pc->frame_start_found = 0;
	60	return i - 5;
	61	}
	62	} else if (nut <= NAL_RASL_R \|\|
	63	(nut >= NAL_BLA_W_LP && nut <= NAL_CRA_NUT)) {
	64	int first_slice_segment_in_pic_flag = buf[i] >> 7;
65	if (first_slice_segment_in_pic_flag) {
66	if (!pc->frame_start_found) {
67	pc->frame_start_found = 1;
68	} else { // First slice of next frame found
69	pc->frame_start_found = 0;
70	return i - 5;
71	}
72	}
73	}
74	}
75
76	return END_NOT_FOUND;
77	}
78
79	/**
80	* Parse NAL units of found picture and decode some basic information.
81	*
82	* @param s parser context.
83	* @param avctx codec context.
84	* @param buf buffer with field/frame data.
85	* @param buf_size size of the buffer.
86	*/
87	static inline int parse_nal_units(AVCodecParserContext s, AVCodecContext avctx,
88	const uint8_t *buf, int buf_size)
89	{
90	HEVCContext h = &((HEVCParseContext )s->priv_data)->h;
91	GetBitContext *gb = &h->HEVClc->gb;
92	SliceHeader *sh = &h->sh;
93	const uint8_t *buf_end = buf + buf_size;
94	int state = -1, i;
95	HEVCNAL *nal;
96
97	/* set some sane default values */
98	s->pict_type = AV_PICTURE_TYPE_I;
99	s->key_frame = 0;
100	s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
101
102	h->avctx = avctx;
103
104	if (!buf_size)
105	return 0;
106
107	if (h->nals_allocated < 1) {
108	HEVCNAL tmp = av_realloc_array(h->nals, 1, sizeof(tmp));
109	if (!tmp)
110	return AVERROR(ENOMEM);
111	h->nals = tmp;
112	memset(h->nals, 0, sizeof(*tmp));
113	h->nals_allocated = 1;
114	}
115
116	nal = &h->nals[0];
117
118	for (;;) {
119	int src_length, consumed;
120	buf = avpriv_find_start_code(buf, buf_end, &state);
121	if (--buf + 2 >= buf_end)
122	break;
123	src_length = buf_end - buf;
124
125	h->nal_unit_type = (*buf >> 1) & 0x3f;
126	h->temporal_id = (*(buf + 1) & 0x07) - 1;
127	if (h->nal_unit_type <= NAL_CRA_NUT) {
128	// Do not walk the whole buffer just to decode slice segment header
129	if (src_length > 20)
130	src_length = 20;
131	}
132
133	consumed = ff_hevc_extract_rbsp(h, buf, src_length, nal);
134	if (consumed < 0)
135	return consumed;
136
137	init_get_bits8(gb, nal->data + 2, nal->size);
138	switch (h->nal_unit_type) {
139	case NAL_VPS:
140	ff_hevc_decode_nal_vps(h);
141	break;
142	case NAL_SPS:
143	ff_hevc_decode_nal_sps(h);
144	break;
145	case NAL_PPS:
146	ff_hevc_decode_nal_pps(h);
147	break;
148	case NAL_SEI_PREFIX:
149	case NAL_SEI_SUFFIX:
150	ff_hevc_decode_nal_sei(h);
151	break;
152	case NAL_TRAIL_N:
153	case NAL_TRAIL_R:
154	case NAL_TSA_N:
155	case NAL_TSA_R:
156	case NAL_STSA_N:
157	case NAL_STSA_R:
158	case NAL_RADL_N:
159	case NAL_RADL_R:
160	case NAL_RASL_N:
161	case NAL_RASL_R:
162	case NAL_BLA_W_LP:
163	case NAL_BLA_W_RADL:
164	case NAL_BLA_N_LP:
165	case NAL_IDR_W_RADL:
166	case NAL_IDR_N_LP:
167	case NAL_CRA_NUT:
168	sh->first_slice_in_pic_flag = get_bits1(gb);
169	s->picture_structure = h->picture_struct;
170	s->field_order = h->picture_struct;
171
172	if (IS_IRAP(h)) {
173	s->key_frame = 1;
174	sh->no_output_of_prior_pics_flag = get_bits1(gb);
175	}
176
177	sh->pps_id = get_ue_golomb(gb);
178	if (sh->pps_id >= MAX_PPS_COUNT \|\| !h->pps_list[sh->pps_id]) {
179	av_log(h->avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", sh->pps_id);
180	return AVERROR_INVALIDDATA;
181	}
182	h->pps = (HEVCPPS*)h->pps_list[sh->pps_id]->data;
183
184	if (h->pps->sps_id >= MAX_SPS_COUNT \|\| !h->sps_list[h->pps->sps_id]) {
185	av_log(h->avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", h->pps->sps_id);
186	return AVERROR_INVALIDDATA;
187	}
188	if (h->sps != (HEVCSPS*)h->sps_list[h->pps->sps_id]->data) {
189	h->sps = (HEVCSPS*)h->sps_list[h->pps->sps_id]->data;
190	h->vps = (HEVCVPS*)h->vps_list[h->sps->vps_id]->data;
191	}
192
193	if (!sh->first_slice_in_pic_flag) {
194	int slice_address_length;
195
196	if (h->pps->dependent_slice_segments_enabled_flag)
197	sh->dependent_slice_segment_flag = get_bits1(gb);
198	else
199	sh->dependent_slice_segment_flag = 0;
200
201	slice_address_length = av_ceil_log2_c(h->sps->ctb_width *
202	h->sps->ctb_height);
203	sh->slice_segment_addr = get_bits(gb, slice_address_length);
204	if (sh->slice_segment_addr >= h->sps->ctb_width * h->sps->ctb_height) {
205	av_log(h->avctx, AV_LOG_ERROR, "Invalid slice segment address: %u.\n",
206	sh->slice_segment_addr);
207	return AVERROR_INVALIDDATA;
208	}
209	} else
210	sh->dependent_slice_segment_flag = 0;
211
212	if (sh->dependent_slice_segment_flag)
213	break;
214
215	for (i = 0; i < h->pps->num_extra_slice_header_bits; i++)
216	skip_bits(gb, 1); // slice_reserved_undetermined_flag[]
217
218	sh->slice_type = get_ue_golomb(gb);
219	if (!(sh->slice_type == I_SLICE \|\| sh->slice_type == P_SLICE \|\|
220	sh->slice_type == B_SLICE)) {
221	av_log(h->avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
222	sh->slice_type);
223	return AVERROR_INVALIDDATA;
224	}
225	s->pict_type = sh->slice_type == B_SLICE ? AV_PICTURE_TYPE_B :
226	sh->slice_type == P_SLICE ? AV_PICTURE_TYPE_P :
227	AV_PICTURE_TYPE_I;
228
229	if (h->pps->output_flag_present_flag)
230	sh->pic_output_flag = get_bits1(gb);
231
232	if (h->sps->separate_colour_plane_flag)
233	sh->colour_plane_id = get_bits(gb, 2);
234
235	if (!IS_IDR(h)) {
236	sh->pic_order_cnt_lsb = get_bits(gb, h->sps->log2_max_poc_lsb);
237	s->output_picture_number = h->poc = ff_hevc_compute_poc(h, sh->pic_order_cnt_lsb);
238	} else
239	s->output_picture_number = h->poc = 0;
240
241	if (h->temporal_id == 0 &&
242	h->nal_unit_type != NAL_TRAIL_N &&
243	h->nal_unit_type != NAL_TSA_N &&
244	h->nal_unit_type != NAL_STSA_N &&
245	h->nal_unit_type != NAL_RADL_N &&
246	h->nal_unit_type != NAL_RASL_N &&
247	h->nal_unit_type != NAL_RADL_R &&
248	h->nal_unit_type != NAL_RASL_R)
249	h->pocTid0 = h->poc;
250
251	return 0; /* no need to evaluate the rest */
252	}
253	buf += consumed;
254	}
255	/* didn't find a picture! */
256	av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit\n");
257	return -1;
258	}
259
260	static int hevc_parse(AVCodecParserContext *s,
261	AVCodecContext *avctx,
262	const uint8_t *poutbuf, int poutbuf_size,
263	const uint8_t *buf, int buf_size)
264	{
265	int next;
266	ParseContext pc = &((HEVCParseContext )s->priv_data)->pc;
267
268	if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
269	next = buf_size;
270	} else {
271	next = hevc_find_frame_end(s, buf, buf_size);
272	if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
273	*poutbuf = NULL;
274	*poutbuf_size = 0;
275	return buf_size;
276	}
277	}
278
279	parse_nal_units(s, avctx, buf, buf_size);
280
281	*poutbuf = buf;
282	*poutbuf_size = buf_size;
283	return next;
284	}
285
286	// Split after the parameter sets at the beginning of the stream if they exist.
287	static int hevc_split(AVCodecContext avctx, const uint8_t buf, int buf_size)
288	{
289	int i;
290	uint32_t state = -1;
291	int has_ps = 0;
292
293	for (i = 0; i < buf_size; i++) {
294	state = (state << 8) \| buf[i];
295	if (((state >> 8) & 0xFFFFFF) == START_CODE) {
296	int nut = (state >> 1) & 0x3F;
297	if (nut >= NAL_VPS && nut <= NAL_PPS)
298	has_ps = 1;
299	else if (has_ps)
300	return i - 3;
301	else // no parameter set at the beginning of the stream
302	return 0;
303	}
304	}
305	return 0;
306	}
307
308	static int hevc_init(AVCodecParserContext *s)
309	{
310	HEVCContext h = &((HEVCParseContext )s->priv_data)->h;
311	h->HEVClc = av_mallocz(sizeof(HEVCLocalContext));
312	h->skipped_bytes_pos_size = INT_MAX;
313
314	return 0;
315	}
316
317	static void hevc_close(AVCodecParserContext *s)
318	{
319	int i;
320	HEVCContext h = &((HEVCParseContext )s->priv_data)->h;
321	ParseContext pc = &((HEVCParseContext )s->priv_data)->pc;
322
323	av_freep(&h->skipped_bytes_pos);
324	av_freep(&h->HEVClc);
325	av_freep(&pc->buffer);
326
327	for (i = 0; i < FF_ARRAY_ELEMS(h->vps_list); i++)
328	av_buffer_unref(&h->vps_list[i]);
329	for (i = 0; i < FF_ARRAY_ELEMS(h->sps_list); i++)
330	av_buffer_unref(&h->sps_list[i]);
331	for (i = 0; i < FF_ARRAY_ELEMS(h->pps_list); i++)
332	av_buffer_unref(&h->pps_list[i]);
333
334	av_buffer_unref(&h->current_sps);
335	h->sps = NULL;
336
337	for (i = 0; i < h->nals_allocated; i++)
338	av_freep(&h->nals[i].rbsp_buffer);
339	av_freep(&h->nals);
340	h->nals_allocated = 0;
341	}
342
343	AVCodecParser ff_hevc_parser = {
344	.codec_ids = { AV_CODEC_ID_HEVC },
345	.priv_data_size = sizeof(HEVCParseContext),
346	.parser_init = hevc_init,
347	.parser_parse = hevc_parse,
348	.parser_close = hevc_close,
349	.split = hevc_split,
350	};