mirror of
https://github.com/FFmpeg/FFmpeg.git
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108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* FTR parser
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* Copyright (c) 2022 Paul B Mahol
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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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* FTR parser
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*/
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#include "parser.h"
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#include "get_bits.h"
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#include "adts_header.h"
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#include "adts_parser.h"
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#include "mpeg4audio.h"
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typedef struct FTRParseContext {
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ParseContext pc;
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int skip;
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int split;
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int frame_index;
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} FTRParseContext;
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static int ftr_parse(AVCodecParserContext *s, 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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uint8_t tmp[8 + AV_INPUT_BUFFER_PADDING_SIZE];
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FTRParseContext *ftr = s->priv_data;
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uint64_t state = ftr->pc.state64;
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int next = END_NOT_FOUND;
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GetBitContext bits;
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AACADTSHeaderInfo hdr;
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int size;
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*poutbuf_size = 0;
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*poutbuf = NULL;
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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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for (int i = 0; i < buf_size; i++) {
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if (ftr->skip > 0) {
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ftr->skip--;
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if (ftr->skip == 0 && ftr->split) {
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ftr->split = 0;
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next = i;
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s->duration = 1024;
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s->key_frame = 1;
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break;
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} else if (ftr->skip > 0) {
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continue;
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}
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}
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state = (state << 8) | buf[i];
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AV_WB64(tmp, state);
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init_get_bits(&bits, tmp + 8 - AV_AAC_ADTS_HEADER_SIZE,
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AV_AAC_ADTS_HEADER_SIZE * 8);
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if ((size = ff_adts_header_parse(&bits, &hdr)) > 0) {
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ftr->skip = size - 6;
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ftr->frame_index += ff_mpeg4audio_channels[hdr.chan_config];
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if (ftr->frame_index >= avctx->ch_layout.nb_channels) {
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ftr->frame_index = 0;
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ftr->split = 1;
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}
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}
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}
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ftr->pc.state64 = state;
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if (ff_combine_frame(&ftr->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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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return next;
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}
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const AVCodecParser ff_ftr_parser = {
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.codec_ids = { AV_CODEC_ID_FTR },
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.priv_data_size = sizeof(FTRParseContext),
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.parser_parse = ftr_parse,
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.parser_close = ff_parse_close,
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};
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