mirror of
https://git.ffmpeg.org/ffmpeg.git
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264 lines
8.1 KiB
C
264 lines
8.1 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include "libavutil/mem.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "get_bits.h"
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#include "h2645_parse.h"
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#include "lcevc.h"
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#include "lcevc_parse.h"
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#include "lcevctab.h"
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#include "parser.h"
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#include "parser_internal.h"
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#define START_CODE 0x000001 ///< start_code_prefix_one_3bytes
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typedef struct LCEVCParserContext {
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ParseContext pc;
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H2645Packet pkt;
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int parsed_extradata;
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int is_lvcc;
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int nal_length_size;
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} LCEVCParserContext;
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static int lcevc_find_frame_end(AVCodecParserContext *s, const uint8_t *buf,
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int buf_size)
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{
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LCEVCParserContext *ctx = s->priv_data;
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ParseContext *pc = &ctx->pc;
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for (int i = 0; i < buf_size; i++) {
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int nut;
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pc->state = (pc->state << 8) | buf[i];
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if (((pc->state >> 8) & 0xFFFFFF) != START_CODE)
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continue;
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nut = (pc->state >> 1) & 0x1F;
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// Beginning of access unit
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if (nut == LCEVC_IDR_NUT || nut == LCEVC_NON_IDR_NUT) {
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if (!pc->frame_start_found)
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pc->frame_start_found = 1;
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else {
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pc->frame_start_found = 0;
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return i - 3;
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}
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}
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}
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return END_NOT_FOUND;
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}
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static const enum AVPixelFormat pix_fmts[4][4] = {
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{ AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, },
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{ AV_PIX_FMT_GRAY10, AV_PIX_FMT_YUV420P10,
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AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10, },
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{ AV_PIX_FMT_GRAY12, AV_PIX_FMT_YUV420P12,
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AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, },
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{ AV_PIX_FMT_GRAY14, AV_PIX_FMT_YUV420P14,
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AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14, },
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};
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static int parse_nal_unit(AVCodecParserContext *s, AVCodecContext *avctx,
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const H2645NAL *nal)
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{
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GetByteContext gbc;
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bytestream2_init(&gbc, nal->data, nal->size);
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bytestream2_skip(&gbc, 2);
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while (bytestream2_get_bytes_left(&gbc) > 1) {
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GetBitContext gb;
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uint64_t payload_size;
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int payload_size_type, payload_type;
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int block_size;
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int ret = init_get_bits8(&gb, gbc.buffer, bytestream2_get_bytes_left(&gbc));
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if (ret < 0)
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return ret;
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payload_size_type = get_bits(&gb, 3);
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payload_type = get_bits(&gb, 5);
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payload_size = payload_size_type;
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if (payload_size_type == 6)
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return AVERROR_PATCHWELCOME;
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if (payload_size_type == 7)
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payload_size = get_mb(&gb);
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if (payload_size > INT_MAX - (get_bits_count(&gb) >> 3))
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return AVERROR_INVALIDDATA;
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block_size = payload_size + (get_bits_count(&gb) >> 3);
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if (block_size >= bytestream2_get_bytes_left(&gbc))
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return AVERROR_INVALIDDATA;
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switch (payload_type) {
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case LCEVC_PAYLOAD_TYPE_SEQUENCE_CONFIG:
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avctx->profile = get_bits(&gb, 4);
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avctx->level = get_bits(&gb, 4);
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break;
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case LCEVC_PAYLOAD_TYPE_GLOBAL_CONFIG: {
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int resolution_type, chroma_format_idc, bit_depth;
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int processed_planes_type_flag;
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processed_planes_type_flag = get_bits1(&gb);
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resolution_type = get_bits(&gb, 6);
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skip_bits1(&gb);
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chroma_format_idc = get_bits(&gb, 2);
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skip_bits(&gb, 2);
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bit_depth = get_bits(&gb, 2); // enhancement_depth_type
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s->format = pix_fmts[bit_depth][chroma_format_idc];
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if (resolution_type < 63) {
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s->width = ff_lcevc_resolution_type[resolution_type].width;
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s->height = ff_lcevc_resolution_type[resolution_type].height;
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} else {
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int upsample_type, tile_dimensions_type;
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int temporal_step_width_modifier_signalled_flag, level1_filtering_signalled_flag;
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// Skip syntax elements until we get to the custom dimension ones
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temporal_step_width_modifier_signalled_flag = get_bits1(&gb);
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skip_bits(&gb, 3);
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upsample_type = get_bits(&gb, 3);
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level1_filtering_signalled_flag = get_bits1(&gb);
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skip_bits(&gb, 4);
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tile_dimensions_type = get_bits(&gb, 2);
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skip_bits(&gb, 4);
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if (processed_planes_type_flag)
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skip_bits(&gb, 4);
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if (temporal_step_width_modifier_signalled_flag)
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skip_bits(&gb, 8);
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if (upsample_type)
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skip_bits_long(&gb, 64);
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if (level1_filtering_signalled_flag)
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skip_bits(&gb, 8);
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if (tile_dimensions_type) {
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if (tile_dimensions_type == 3)
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skip_bits_long(&gb, 32);
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skip_bits(&gb, 8);
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}
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s->width = get_bits(&gb, 16);
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s->height = get_bits(&gb, 16);
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}
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break;
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}
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default:
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break;
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}
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bytestream2_skip(&gbc, block_size);
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}
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return 0;
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}
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static int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
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int buf_size, AVCodecContext *avctx)
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{
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LCEVCParserContext *ctx = s->priv_data;
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int flags = (H2645_FLAG_IS_NALFF * !!ctx->is_lvcc) | H2645_FLAG_SMALL_PADDING;
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int ret, i;
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/* set some sane default values */
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s->pict_type = AV_PICTURE_TYPE_NONE;
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s->key_frame = 0;
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s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
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ret = ff_h2645_packet_split(&ctx->pkt, buf, buf_size, avctx,
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ctx->nal_length_size, AV_CODEC_ID_LCEVC, flags);
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if (ret < 0)
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return ret;
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for (i = 0; i < ctx->pkt.nb_nals; i++) {
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H2645NAL *nal = &ctx->pkt.nals[i];
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switch (nal->type) {
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case LCEVC_IDR_NUT:
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s->key_frame = 1;
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// fall-through
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case LCEVC_NON_IDR_NUT:
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parse_nal_unit(s, avctx, nal);
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break;
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default:
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break;
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}
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}
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return 0;
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}
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static int lcevc_parse(AVCodecParserContext *s,
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AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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LCEVCParserContext *ctx = s->priv_data;
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ParseContext *pc = &ctx->pc;
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int next;
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if (!ctx->parsed_extradata && avctx->extradata_size > 4) {
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ctx->parsed_extradata = 1;
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ctx->is_lvcc = !!avctx->extradata[0];
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if (ctx->is_lvcc)
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ctx->nal_length_size = (avctx->extradata[4] >> 6) + 1;
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}
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if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
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next = buf_size;
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} else {
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next = lcevc_find_frame_end(s, buf, buf_size);
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if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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}
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parse_nal_units(s, buf, buf_size, avctx);
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return next;
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}
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static void lcevc_parser_close(AVCodecParserContext *s)
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{
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LCEVCParserContext *ctx = s->priv_data;
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ff_h2645_packet_uninit(&ctx->pkt);
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av_freep(&ctx->pc.buffer);
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}
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const FFCodecParser ff_lcevc_parser = {
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PARSER_CODEC_LIST(AV_CODEC_ID_LCEVC),
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.priv_data_size = sizeof(LCEVCParserContext),
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.parse = lcevc_parse,
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.close = lcevc_parser_close,
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};
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