300 lines
8.3 KiB
C
300 lines
8.3 KiB
C
/*
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* Chinese AVS video (AVS1-P2, JiZhun profile) parser.
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* Copyright (c) 2006 Stefan Gehrer <[email protected]>
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*
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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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/**
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* @file
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* Chinese AVS video (AVS1-P2, JiZhun profile) parser
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* @author Stefan Gehrer <[email protected]>
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*/
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#include "parser.h"
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#include "cavs.h"
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#ifdef AMFFMPEG
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/**
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* Find the end of the current frame in the bitstream.
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* @return the position of the first byte of the next frame, or -1
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*/
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const AVRational avs2_fps_tab[] = {
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{ 0, 0},
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{1001, 24000},
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{ 1, 24},
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{ 1, 25},
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{1001, 30000},
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{ 1, 30},
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{ 1, 50},
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{1001, 60000},
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{ 1, 60},
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{ 1, 100},
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{ 1, 120},
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{ 1, 200},
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{ 1, 240},
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{ 1, 300},
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{ 0, 0},
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};
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#endif
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static int cavs_find_frame_end(ParseContext *pc, const uint8_t *buf,
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int buf_size) {
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int pic_found, i;
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uint32_t state;
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pic_found= pc->frame_start_found;
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state= pc->state;
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i=0;
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if(!pic_found){
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for(i=0; i<buf_size; i++){
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state= (state<<8) | buf[i];
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if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){
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i++;
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pic_found=1;
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break;
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}
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}
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}
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if(pic_found){
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/* EOF considered as end of frame */
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if (buf_size == 0)
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return 0;
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for(; i<buf_size; i++){
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state= (state<<8) | buf[i];
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if((state&0xFFFFFF00) == 0x100){
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#ifdef AMFFMPEG
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if (state == USER_START_CODE ||
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state == EXT_START_CODE) {
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/* skip */
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continue;
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}
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#endif
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if(state > SLICE_MAX_START_CODE){
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pc->frame_start_found=0;
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pc->state=-1;
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return i-3;
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}
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}
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}
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}
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pc->frame_start_found= pic_found;
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pc->state= state;
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return END_NOT_FOUND;
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}
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#ifdef AMFFMPEG
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const uint8_t *find_start_code(const uint8_t * restrict p, const uint8_t *end,
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uint32_t * restrict state)
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{
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int i;
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assert(p <= end);
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if (p >= end) {
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return end;
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}
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for (i=0; i<3; i++) {
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uint32_t tmp= *state << 8;
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*state= tmp + *(p++);
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if (tmp == 0x100 || p == end)
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return p;
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}
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while (p < end) {
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if (p[-1] > 1) p+= 3;
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else if (p[-2]) p+= 2;
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else if (p[-3]|(p[-1]-1)) p++;
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else {
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p++;
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break;
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}
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}
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p= FFMIN(p, end)-4;
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*state = AV_RB32(p);
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return p+4;
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}
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static void parse_avs_nal_units(AVCodecParserContext *s, const uint8_t *buf, int buf_size, AVCodecContext *avctx)
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{
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if (buf_size < 5) {
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return;
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}
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/* set default values */
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s->key_frame = 0;
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if (buf[0] == 0x0 && buf[1] == 0x0 && buf[2] == 0x1) {
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if (buf[3] == (CAVS_START_CODE & 0xff) || buf[3] == (PIC_I_START_CODE & 0xff)) {
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s->key_frame = 1;
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s->pict_type = AV_PICTURE_TYPE_I;
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} else if (buf[3] == (PIC_PB_START_CODE & 0xff)) {
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s->key_frame = 0;
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if (buf_size > 9) {
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int pic_code_type = buf[8] & 0x3;
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if (pic_code_type == 1 || pic_code_type == 3) {
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s->pict_type = AV_PICTURE_TYPE_P;
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} else {
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s->pict_type = AV_PICTURE_TYPE_B;
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}
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}
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}
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}
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}
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static void cavs2video_extract_headers(AVCodecParserContext *s,
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AVCodecContext *avctx,
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const uint8_t *buf, int buf_size)
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{
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// ParseContext1 *pc = s->priv_data;
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//uint8_t * buf = buf_in;
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const uint8_t *buf_end = buf + buf_size;
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int bytes_left;
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uint32_t start_code = -1;
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int profile_id, level_id, progressive_seq, field_coded_seq;
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int chroma_format, sample_precision, enc_precision;
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int aspect_ratio, frame_rate_code;
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while (buf < buf_end) {
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buf = find_start_code(buf, buf_end, &start_code);
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bytes_left = buf_end - buf;
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switch (start_code) {
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case CAVS_START_CODE:
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profile_id = AV_RB8(buf);
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level_id = AV_RB8(buf + 1);
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progressive_seq = AV_RB16(buf + 2) >> 15;
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field_coded_seq = AV_RB16(buf + 2) >> 14 & 0x1;
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chroma_format = AV_RB16(buf + 4) & 0x3;
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sample_precision = AV_RB16(buf + 6) >> 13;
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aspect_ratio = AV_RB16(buf + 6) >> 6 & 0xf;
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frame_rate_code = AV_RB16(buf + 6) >> 2 & 0xf;
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if (profile_id == 0x22)
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enc_precision = AV_RB16(buf + 6) >> 10 & 0x3;
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avctx->width = AV_RB16(buf + 2) & 0x3fff;
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avctx->height = AV_RB16(buf + 4) >> 2 & 0x3fff;
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avctx->time_base.den = avs2_fps_tab[frame_rate_code].den;
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avctx->time_base.num = avs2_fps_tab[frame_rate_code].num;
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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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}
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#endif
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static int cavsvideo_parse(AVCodecParserContext *s,
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AVCodecContext *avctx,
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const uint8_t **p_out_buf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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ParseContext *pc = s->priv_data;
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int next;
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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= cavs_find_frame_end(pc, buf, buf_size);
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if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
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*p_out_buf = 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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#ifdef AMFFMPEG
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parse_avs_nal_units(s, buf, buf_size, avctx);
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#endif
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*p_out_buf = buf;
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*poutbuf_size = buf_size;
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return next;
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}
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#ifdef AMFFMPEG
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static int cavs2video_parse(AVCodecParserContext *s,
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AVCodecContext *avctx,
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const uint8_t **p_out_buf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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ParseContext *pc = s->priv_data;
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int next;
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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= cavs_find_frame_end(pc, buf, buf_size);
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if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
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*p_out_buf = 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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/* set default values */
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s->key_frame = 0;
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if (buf[0] == 0x0 && buf[1] == 0x0 && buf[2] == 0x1) {
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if (buf[3] == (CAVS_START_CODE & 0xff) || buf[3] == (PIC_I_START_CODE & 0xff)
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|| buf[3] == 0xb1) {
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s->key_frame = 1;
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}else if (buf[3] == (PIC_PB_START_CODE & 0xff)) {
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s->key_frame = 0;
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if (buf_size > 9) {
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int pic_code_type = buf[8] & 0x3;
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if (pic_code_type == 1 || pic_code_type == 3) {
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s->pict_type = AV_PICTURE_TYPE_P;
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} else {
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s->pict_type = AV_PICTURE_TYPE_B;
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}
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}
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}
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}
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if (1) cavs2video_extract_headers(s, avctx, buf, buf_size);
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//avctx->time_base.den = 30000;
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//avctx->time_base.num = 1000;
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*p_out_buf = buf;
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*poutbuf_size = buf_size;
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return next;
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}
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#endif
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AVCodecParser ff_cavsvideo_parser = {
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.codec_ids = { AV_CODEC_ID_CAVS },
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.priv_data_size = sizeof(ParseContext),
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.parser_parse = cavsvideo_parse,
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.parser_close = ff_parse_close,
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.split = ff_mpeg4video_split,
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};
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#ifdef AMFFMPEG
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AVCodecParser ff_cavs2video_parser = {
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.codec_ids = { AV_CODEC_ID_CAVS2 },
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.priv_data_size = sizeof(ParseContext),
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.parser_parse = cavs2video_parse,
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.parser_close = ff_parse_close,
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.split = ff_mpeg4video_split,
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};
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#endif
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