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