libavcodec/hevc_parser.c - manifest_repos/ffmpeg - Git at Google

 /*
  * 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 "golomb.h"
 #include "hevc.h"
 #include "hevc_parse.h"
 #include "hevc_ps.h"
 #include "hevc_sei.h"
 #include "h2645_parse.h"
 #include "internal.h"
 #include "parser.h"

 #define START_CODE 0x000001 ///< start_code_prefix_one_3bytes

 #define IS_IRAP_NAL(nal) (nal->type >= 16 && nal->type <= 23)
 #define IS_IDR_NAL(nal) (nal->type == HEVC_NAL_IDR_W_RADL || nal->type == HEVC_NAL_IDR_N_LP)

 typedef struct HEVCParserContext {
     ParseContext pc;

     H2645Packet pkt;
     HEVCParamSets ps;
     HEVCSEI sei;

     int is_avc;
     int nal_length_size;
     int parsed_extradata;

     int poc;
     int pocTid0;
 } HEVCParserContext;

 static int hevc_parse_slice_header(AVCodecParserContext *s, H2645NAL *nal,
                                    AVCodecContext *avctx)
 {
     HEVCParserContext *ctx = s->priv_data;
     HEVCParamSets *ps = &ctx->ps;
     HEVCSEI *sei = &ctx->sei;
     GetBitContext *gb = &nal->gb;
     const HEVCWindow *ow;
     int i, num = 0, den = 0;

     unsigned int pps_id, first_slice_in_pic_flag, dependent_slice_segment_flag;
     enum HEVCSliceType slice_type;

     first_slice_in_pic_flag = get_bits1(gb);
     s->picture_structure = sei->picture_timing.picture_struct;
     s->field_order = sei->picture_timing.picture_struct;

     if (IS_IRAP_NAL(nal)) {
         s->key_frame = 1;
         skip_bits1(gb); // no_output_of_prior_pics_flag
     }

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

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

     s->coded_width  = ps->sps->width;
     s->coded_height = ps->sps->height;
     s->width        = ps->sps->width  - ow->left_offset - ow->right_offset;
     s->height       = ps->sps->height - ow->top_offset  - ow->bottom_offset;
     s->format       = ps->sps->pix_fmt;
     avctx->profile  = ps->sps->ptl.general_ptl.profile_idc;
     avctx->level    = ps->sps->ptl.general_ptl.level_idc;

     if (ps->vps->vps_timing_info_present_flag) {
         num = ps->vps->vps_num_units_in_tick;
         den = ps->vps->vps_time_scale;
     } else if (ps->sps->vui.vui_timing_info_present_flag) {
         num = ps->sps->vui.vui_num_units_in_tick;
         den = ps->sps->vui.vui_time_scale;
     }

     if (num != 0 && den != 0)
         av_reduce(&avctx->framerate.den, &avctx->framerate.num,
                   num, den, 1 << 30);

     if (!first_slice_in_pic_flag) {
         unsigned int slice_segment_addr;
         int slice_address_length;

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

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

     if (dependent_slice_segment_flag)
         return 0; /* break; */

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

     slice_type = get_ue_golomb_31(gb);
     if (!(slice_type == HEVC_SLICE_I || slice_type == HEVC_SLICE_P ||
           slice_type == HEVC_SLICE_B)) {
         av_log(avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
                slice_type);
         return AVERROR_INVALIDDATA;
     }
     s->pict_type = slice_type == HEVC_SLICE_B ? AV_PICTURE_TYPE_B :
                    slice_type == HEVC_SLICE_P ? AV_PICTURE_TYPE_P :
                                                 AV_PICTURE_TYPE_I;

     if (ps->pps->output_flag_present_flag)
         skip_bits1(gb); // pic_output_flag

     if (ps->sps->separate_colour_plane_flag)
         skip_bits(gb, 2);   // colour_plane_id

     if (!IS_IDR_NAL(nal)) {
         int pic_order_cnt_lsb = get_bits(gb, ps->sps->log2_max_poc_lsb);
         s->output_picture_number = ctx->poc =
             ff_hevc_compute_poc(ps->sps, ctx->pocTid0, pic_order_cnt_lsb, nal->type);
     } else
         s->output_picture_number = ctx->poc = 0;

     if (nal->temporal_id == 0 &&
         nal->type != HEVC_NAL_TRAIL_N &&
         nal->type != HEVC_NAL_TSA_N &&
         nal->type != HEVC_NAL_STSA_N &&
         nal->type != HEVC_NAL_RADL_N &&
         nal->type != HEVC_NAL_RASL_N &&
         nal->type != HEVC_NAL_RADL_R &&
         nal->type != HEVC_NAL_RASL_R)
         ctx->pocTid0 = ctx->poc;

     return 1; /* no need to evaluate the rest */
 }

 /**
  * 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 int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
                            int buf_size, AVCodecContext *avctx)
 {
     HEVCParserContext *ctx = s->priv_data;
     HEVCParamSets *ps = &ctx->ps;
     HEVCSEI *sei = &ctx->sei;
     int ret, i;

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

     ff_hevc_reset_sei(sei);

     ret = ff_h2645_packet_split(&ctx->pkt, buf, buf_size, avctx, ctx->is_avc,
                                 ctx->nal_length_size, AV_CODEC_ID_HEVC, 1, 0);
     if (ret < 0)
         return ret;

     for (i = 0; i < ctx->pkt.nb_nals; i++) {
         H2645NAL *nal = &ctx->pkt.nals[i];
         GetBitContext *gb = &nal->gb;

         if (nal->nuh_layer_id > 0)
             continue;

         switch (nal->type) {
         case HEVC_NAL_VPS:
             ff_hevc_decode_nal_vps(gb, avctx, ps);
             break;
         case HEVC_NAL_SPS:
             ff_hevc_decode_nal_sps(gb, avctx, ps, 1);
             break;
         case HEVC_NAL_PPS:
             ff_hevc_decode_nal_pps(gb, avctx, ps);
             break;
         case HEVC_NAL_SEI_PREFIX:
         case HEVC_NAL_SEI_SUFFIX:
             ff_hevc_decode_nal_sei(gb, avctx, sei, ps, nal->type);
             break;
         case HEVC_NAL_TRAIL_N:
         case HEVC_NAL_TRAIL_R:
         case HEVC_NAL_TSA_N:
         case HEVC_NAL_TSA_R:
         case HEVC_NAL_STSA_N:
         case HEVC_NAL_STSA_R:
         case HEVC_NAL_BLA_W_LP:
         case HEVC_NAL_BLA_W_RADL:
         case HEVC_NAL_BLA_N_LP:
         case HEVC_NAL_IDR_W_RADL:
         case HEVC_NAL_IDR_N_LP:
         case HEVC_NAL_CRA_NUT:
         case HEVC_NAL_RADL_N:
         case HEVC_NAL_RADL_R:
         case HEVC_NAL_RASL_N:
         case HEVC_NAL_RASL_R:
             if (ctx->sei.picture_timing.picture_struct == HEVC_SEI_PIC_STRUCT_FRAME_DOUBLING) {
                 s->repeat_pict = 1;
             } else if (ctx->sei.picture_timing.picture_struct == HEVC_SEI_PIC_STRUCT_FRAME_TRIPLING) {
                 s->repeat_pict = 2;
             }
             ret = hevc_parse_slice_header(s, nal, avctx);
             if (ret)
                 return ret;
             break;
         }
     }
     /* didn't find a picture! */
     av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
     return -1;
 }

 /**
  * 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)
 {
     HEVCParserContext *ctx = s->priv_data;
     ParseContext       *pc = &ctx->pc;
     int i;

     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 >= HEVC_NAL_VPS && nut <= HEVC_NAL_EOB_NUT) || nut == HEVC_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 <= HEVC_NAL_RASL_R ||
                    (nut >= HEVC_NAL_BLA_W_LP && nut <= HEVC_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;
 }

 static int hevc_parse(AVCodecParserContext *s, AVCodecContext *avctx,
                       const uint8_t **poutbuf, int *poutbuf_size,
                       const uint8_t *buf, int buf_size)
 {
     int next;
     HEVCParserContext *ctx = s->priv_data;
     ParseContext *pc = &ctx->pc;
     int is_dummy_buf = !buf_size;
     const uint8_t *dummy_buf = buf;

     if (avctx->extradata && !ctx->parsed_extradata) {
         ff_hevc_decode_extradata(avctx->extradata, avctx->extradata_size, &ctx->ps, &ctx->sei,
                                  &ctx->is_avc, &ctx->nal_length_size, avctx->err_recognition,
                                  1, avctx);
         ctx->parsed_extradata = 1;
     }

     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;
         }
     }

     is_dummy_buf &= (dummy_buf == buf);

     if (!is_dummy_buf)
         parse_nal_units(s, buf, buf_size, avctx);

     *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)
 {
     const uint8_t *ptr = buf, *end = buf + buf_size;
     uint32_t state = -1;
     int has_vps = 0;
     int has_sps = 0;
     int has_pps = 0;
     int nut;

     while (ptr < end) {
         ptr = avpriv_find_start_code(ptr, end, &state);
         if ((state >> 8) != START_CODE)
             break;
         nut = (state >> 1) & 0x3F;
         if (nut == HEVC_NAL_VPS)
             has_vps = 1;
         else if (nut == HEVC_NAL_SPS)
             has_sps = 1;
         else if (nut == HEVC_NAL_PPS)
             has_pps = 1;
         else if ((nut != HEVC_NAL_SEI_PREFIX || has_pps) &&
                   nut != HEVC_NAL_AUD) {
             if (has_vps && has_sps) {
                 while (ptr - 4 > buf && ptr[-5] == 0)
                     ptr--;
                 return ptr - 4 - buf;
             }
         }
     }
     return 0;
 }

 static void hevc_parser_close(AVCodecParserContext *s)
 {
     HEVCParserContext *ctx = s->priv_data;

     ff_hevc_ps_uninit(&ctx->ps);
     ff_h2645_packet_uninit(&ctx->pkt);
     ff_hevc_reset_sei(&ctx->sei);

     av_freep(&ctx->pc.buffer);
 }

 AVCodecParser ff_hevc_parser = {
     .codec_ids      = { AV_CODEC_ID_HEVC },
     .priv_data_size = sizeof(HEVCParserContext),
     .parser_parse   = hevc_parse,
     .parser_close   = hevc_parser_close,
     .split          = hevc_split,
 };
	/*
	* 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 "golomb.h"
	#include "hevc.h"
	#include "hevc_parse.h"
	#include "hevc_ps.h"
	#include "hevc_sei.h"
	#include "h2645_parse.h"
	#include "internal.h"
	#include "parser.h"

	#define START_CODE 0x000001 ///< start_code_prefix_one_3bytes

	#define IS_IRAP_NAL(nal) (nal->type >= 16 && nal->type <= 23)
	#define IS_IDR_NAL(nal) (nal->type == HEVC_NAL_IDR_W_RADL \|\| nal->type == HEVC_NAL_IDR_N_LP)

	typedef struct HEVCParserContext {
	ParseContext pc;

	H2645Packet pkt;
	HEVCParamSets ps;
	HEVCSEI sei;

	int is_avc;
	int nal_length_size;
	int parsed_extradata;

	int poc;
	int pocTid0;
	} HEVCParserContext;

	static int hevc_parse_slice_header(AVCodecParserContext s, H2645NAL nal,
	AVCodecContext *avctx)
	{
	HEVCParserContext *ctx = s->priv_data;
	HEVCParamSets *ps = &ctx->ps;
	HEVCSEI *sei = &ctx->sei;
	GetBitContext *gb = &nal->gb;
	const HEVCWindow *ow;
	int i, num = 0, den = 0;

	unsigned int pps_id, first_slice_in_pic_flag, dependent_slice_segment_flag;
	enum HEVCSliceType slice_type;

	first_slice_in_pic_flag = get_bits1(gb);
	s->picture_structure = sei->picture_timing.picture_struct;
	s->field_order = sei->picture_timing.picture_struct;

	if (IS_IRAP_NAL(nal)) {
	s->key_frame = 1;
	skip_bits1(gb); // no_output_of_prior_pics_flag
	}

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

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

	s->coded_width = ps->sps->width;
	s->coded_height = ps->sps->height;
	s->width = ps->sps->width - ow->left_offset - ow->right_offset;
	s->height = ps->sps->height - ow->top_offset - ow->bottom_offset;
	s->format = ps->sps->pix_fmt;
	avctx->profile = ps->sps->ptl.general_ptl.profile_idc;
	avctx->level = ps->sps->ptl.general_ptl.level_idc;

	if (ps->vps->vps_timing_info_present_flag) {
	num = ps->vps->vps_num_units_in_tick;
	den = ps->vps->vps_time_scale;
	} else if (ps->sps->vui.vui_timing_info_present_flag) {
	num = ps->sps->vui.vui_num_units_in_tick;
	den = ps->sps->vui.vui_time_scale;
	}

	if (num != 0 && den != 0)
	av_reduce(&avctx->framerate.den, &avctx->framerate.num,
	num, den, 1 << 30);

	if (!first_slice_in_pic_flag) {
	unsigned int slice_segment_addr;
	int slice_address_length;

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

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

	if (dependent_slice_segment_flag)
	return 0; /* break; */

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

	slice_type = get_ue_golomb_31(gb);
	if (!(slice_type == HEVC_SLICE_I \|\| slice_type == HEVC_SLICE_P \|\|
	slice_type == HEVC_SLICE_B)) {
	av_log(avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
	slice_type);
	return AVERROR_INVALIDDATA;
	}
	s->pict_type = slice_type == HEVC_SLICE_B ? AV_PICTURE_TYPE_B :
	slice_type == HEVC_SLICE_P ? AV_PICTURE_TYPE_P :
	AV_PICTURE_TYPE_I;

	if (ps->pps->output_flag_present_flag)
	skip_bits1(gb); // pic_output_flag

	if (ps->sps->separate_colour_plane_flag)
	skip_bits(gb, 2); // colour_plane_id

	if (!IS_IDR_NAL(nal)) {
	int pic_order_cnt_lsb = get_bits(gb, ps->sps->log2_max_poc_lsb);
	s->output_picture_number = ctx->poc =
	ff_hevc_compute_poc(ps->sps, ctx->pocTid0, pic_order_cnt_lsb, nal->type);
	} else
	s->output_picture_number = ctx->poc = 0;

	if (nal->temporal_id == 0 &&
	nal->type != HEVC_NAL_TRAIL_N &&
	nal->type != HEVC_NAL_TSA_N &&
	nal->type != HEVC_NAL_STSA_N &&
	nal->type != HEVC_NAL_RADL_N &&
	nal->type != HEVC_NAL_RASL_N &&
	nal->type != HEVC_NAL_RADL_R &&
	nal->type != HEVC_NAL_RASL_R)
	ctx->pocTid0 = ctx->poc;

	return 1; /* no need to evaluate the rest */
	}

	/**
	* 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 int parse_nal_units(AVCodecParserContext s, const uint8_t buf,
	int buf_size, AVCodecContext *avctx)
	{
	HEVCParserContext *ctx = s->priv_data;
	HEVCParamSets *ps = &ctx->ps;
	HEVCSEI *sei = &ctx->sei;
	int ret, i;

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

	ff_hevc_reset_sei(sei);

	ret = ff_h2645_packet_split(&ctx->pkt, buf, buf_size, avctx, ctx->is_avc,
	ctx->nal_length_size, AV_CODEC_ID_HEVC, 1, 0);
	if (ret < 0)
	return ret;

	for (i = 0; i < ctx->pkt.nb_nals; i++) {
	H2645NAL *nal = &ctx->pkt.nals[i];
	GetBitContext *gb = &nal->gb;

	if (nal->nuh_layer_id > 0)
	continue;

	switch (nal->type) {
	case HEVC_NAL_VPS:
	ff_hevc_decode_nal_vps(gb, avctx, ps);
	break;
	case HEVC_NAL_SPS:
	ff_hevc_decode_nal_sps(gb, avctx, ps, 1);
	break;
	case HEVC_NAL_PPS:
	ff_hevc_decode_nal_pps(gb, avctx, ps);
	break;
	case HEVC_NAL_SEI_PREFIX:
	case HEVC_NAL_SEI_SUFFIX:
	ff_hevc_decode_nal_sei(gb, avctx, sei, ps, nal->type);
	break;
	case HEVC_NAL_TRAIL_N:
	case HEVC_NAL_TRAIL_R:
	case HEVC_NAL_TSA_N:
	case HEVC_NAL_TSA_R:
	case HEVC_NAL_STSA_N:
	case HEVC_NAL_STSA_R:
	case HEVC_NAL_BLA_W_LP:
	case HEVC_NAL_BLA_W_RADL:
	case HEVC_NAL_BLA_N_LP:
	case HEVC_NAL_IDR_W_RADL:
	case HEVC_NAL_IDR_N_LP:
	case HEVC_NAL_CRA_NUT:
	case HEVC_NAL_RADL_N:
	case HEVC_NAL_RADL_R:
	case HEVC_NAL_RASL_N:
	case HEVC_NAL_RASL_R:
	if (ctx->sei.picture_timing.picture_struct == HEVC_SEI_PIC_STRUCT_FRAME_DOUBLING) {
	s->repeat_pict = 1;
	} else if (ctx->sei.picture_timing.picture_struct == HEVC_SEI_PIC_STRUCT_FRAME_TRIPLING) {
	s->repeat_pict = 2;
	}
	ret = hevc_parse_slice_header(s, nal, avctx);
	if (ret)
	return ret;
	break;
	}
	}
	/* didn't find a picture! */
	av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
	return -1;
	}

	/**
	* 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)
	{
	HEVCParserContext *ctx = s->priv_data;
	ParseContext *pc = &ctx->pc;
	int i;

	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 >= HEVC_NAL_VPS && nut <= HEVC_NAL_EOB_NUT) \|\| nut == HEVC_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 <= HEVC_NAL_RASL_R \|\|
	(nut >= HEVC_NAL_BLA_W_LP && nut <= HEVC_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;
	}

	static int hevc_parse(AVCodecParserContext s, AVCodecContext avctx,
	const uint8_t *poutbuf, int poutbuf_size,
	const uint8_t *buf, int buf_size)
	{
	int next;
	HEVCParserContext *ctx = s->priv_data;
	ParseContext *pc = &ctx->pc;
	int is_dummy_buf = !buf_size;
	const uint8_t *dummy_buf = buf;

	if (avctx->extradata && !ctx->parsed_extradata) {
	ff_hevc_decode_extradata(avctx->extradata, avctx->extradata_size, &ctx->ps, &ctx->sei,
	&ctx->is_avc, &ctx->nal_length_size, avctx->err_recognition,
	1, avctx);
	ctx->parsed_extradata = 1;
	}

	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;
	}
	}

	is_dummy_buf &= (dummy_buf == buf);

	if (!is_dummy_buf)
	parse_nal_units(s, buf, buf_size, avctx);

	*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)
	{
	const uint8_t ptr = buf, end = buf + buf_size;
	uint32_t state = -1;
	int has_vps = 0;
	int has_sps = 0;
	int has_pps = 0;
	int nut;

	while (ptr < end) {
	ptr = avpriv_find_start_code(ptr, end, &state);
	if ((state >> 8) != START_CODE)
	break;
	nut = (state >> 1) & 0x3F;
	if (nut == HEVC_NAL_VPS)
	has_vps = 1;
	else if (nut == HEVC_NAL_SPS)
	has_sps = 1;
	else if (nut == HEVC_NAL_PPS)
	has_pps = 1;
	else if ((nut != HEVC_NAL_SEI_PREFIX \|\| has_pps) &&
	nut != HEVC_NAL_AUD) {
	if (has_vps && has_sps) {
	while (ptr - 4 > buf && ptr[-5] == 0)
	ptr--;
	return ptr - 4 - buf;
	}
	}
	}
	return 0;
	}

	static void hevc_parser_close(AVCodecParserContext *s)
	{
	HEVCParserContext *ctx = s->priv_data;

	ff_hevc_ps_uninit(&ctx->ps);
	ff_h2645_packet_uninit(&ctx->pkt);
	ff_hevc_reset_sei(&ctx->sei);

	av_freep(&ctx->pc.buffer);
	}

	AVCodecParser ff_hevc_parser = {
	.codec_ids = { AV_CODEC_ID_HEVC },
	.priv_data_size = sizeof(HEVCParserContext),
	.parser_parse = hevc_parse,
	.parser_close = hevc_parser_close,
	.split = hevc_split,
	};