| /* |
| * AVS3-P2/IEEE1857.10 video parser. |
| * Copyright (c) 2020 Zhenyu Wang <wangzhenyu@pkusz.edu.cn> |
| * Bingjie Han <hanbj@pkusz.edu.cn> |
| * Huiwen Ren <hwrenx@gmail.com> |
| * |
| * 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 "avs3.h" |
| #include "get_bits.h" |
| #include "parser.h" |
| |
| static int avs3_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) |
| { |
| int pic_found = pc->frame_start_found; |
| uint32_t state = pc->state; |
| int cur = 0; |
| |
| if (!pic_found) { |
| for (; cur < buf_size; ++cur) { |
| state = (state << 8) | buf[cur]; |
| if (AVS3_ISPIC(buf[cur])){ |
| cur++; |
| pic_found = 1; |
| break; |
| } |
| } |
| } |
| |
| if (pic_found) { |
| if (!buf_size) |
| return END_NOT_FOUND; |
| for (; cur < buf_size; ++cur) { |
| state = (state << 8) | buf[cur]; |
| if ((state & 0xFFFFFF00) == 0x100 && AVS3_ISUNIT(state & 0xFF)) { |
| pc->frame_start_found = 0; |
| pc->state = -1; |
| return cur - 3; |
| } |
| } |
| } |
| |
| pc->frame_start_found = pic_found; |
| pc->state = state; |
| |
| return END_NOT_FOUND; |
| } |
| |
| static void parse_avs3_nal_units(AVCodecParserContext *s, const uint8_t *buf, |
| int buf_size, AVCodecContext *avctx) |
| { |
| if (buf_size < 5) { |
| return; |
| } |
| |
| if (buf[0] == 0x0 && buf[1] == 0x0 && buf[2] == 0x1) { |
| if (buf[3] == AVS3_SEQ_START_CODE) { |
| GetBitContext gb; |
| int profile, ratecode; |
| |
| init_get_bits(&gb, buf + 4, buf_size - 4); |
| |
| s->key_frame = 1; |
| s->pict_type = AV_PICTURE_TYPE_I; |
| |
| profile = get_bits(&gb, 8); |
| // Skip bits: level(8) |
| // progressive(1) |
| // field(1) |
| // library(2) |
| // resv(1) |
| // width(14) |
| // resv(1) |
| // height(14) |
| // chroma(2) |
| // sampe_precision(3) |
| skip_bits(&gb, 47); |
| |
| if (profile == AVS3_PROFILE_BASELINE_MAIN10) { |
| int sample_precision = get_bits(&gb, 3); |
| if (sample_precision == 1) { |
| avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| } else if (sample_precision == 2) { |
| avctx->pix_fmt = AV_PIX_FMT_YUV420P10LE; |
| } else { |
| avctx->pix_fmt = AV_PIX_FMT_NONE; |
| } |
| } |
| |
| // Skip bits: resv(1) |
| // aspect(4) |
| skip_bits(&gb, 5); |
| |
| ratecode = get_bits(&gb, 4); |
| |
| // Skip bits: resv(1) |
| // bitrate_low(18) |
| // resv(1) |
| // bitrate_high(12) |
| skip_bits(&gb, 32); |
| |
| avctx->has_b_frames = !get_bits(&gb, 1); |
| |
| avctx->framerate.num = avctx->time_base.den = ff_avs3_frame_rate_tab[ratecode].num; |
| avctx->framerate.den = avctx->time_base.num = ff_avs3_frame_rate_tab[ratecode].den; |
| |
| s->width = s->coded_width = avctx->width; |
| s->height = s->coded_height = avctx->height; |
| |
| av_log(avctx, AV_LOG_DEBUG, |
| "AVS3 parse seq HDR: profile %d; coded size: %dx%d; frame rate code: %d\n", |
| profile, avctx->width, avctx->height, ratecode); |
| |
| } else if (buf[3] == AVS3_INTRA_PIC_START_CODE) { |
| s->key_frame = 1; |
| s->pict_type = AV_PICTURE_TYPE_I; |
| } else if (buf[3] == AVS3_INTER_PIC_START_CODE){ |
| s->key_frame = 0; |
| if (buf_size > 9) { |
| int pic_code_type = buf[8] & 0x3; |
| if (pic_code_type == 1 || pic_code_type == 3) { |
| s->pict_type = AV_PICTURE_TYPE_P; |
| } else { |
| s->pict_type = AV_PICTURE_TYPE_B; |
| } |
| } |
| } |
| } |
| } |
| |
| |
| static int avs3_parse(AVCodecParserContext *s, AVCodecContext *avctx, |
| const uint8_t **poutbuf, int *poutbuf_size, |
| const uint8_t *buf, int buf_size) |
| { |
| ParseContext *pc = s->priv_data; |
| int next; |
| |
| if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { |
| next = buf_size; |
| } else { |
| next = avs3_find_frame_end(pc, buf, buf_size); |
| if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
| *poutbuf = NULL; |
| *poutbuf_size = 0; |
| return buf_size; |
| } |
| } |
| |
| parse_avs3_nal_units(s, buf, buf_size, avctx); |
| |
| *poutbuf = buf; |
| *poutbuf_size = buf_size; |
| |
| return next; |
| } |
| |
| AVCodecParser ff_avs3_parser = { |
| .codec_ids = { AV_CODEC_ID_AVS3 }, |
| .priv_data_size = sizeof(ParseContext), |
| .parser_parse = avs3_parse, |
| .parser_close = ff_parse_close, |
| .split = ff_mpeg4video_split, |
| }; |