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| | 1 | /* |
| | 2 | * This file is part of FFmpeg. |
| | 3 | * |
| | 4 | * FFmpeg is free software; you can redistribute it and/or |
| | 5 | * modify it under the terms of the GNU Lesser General Public |
| | 6 | * License as published by the Free Software Foundation; either |
| | 7 | * version 2.1 of the License, or (at your option) any later version. |
| | 8 | * |
| | 9 | * FFmpeg is distributed in the hope that it will be useful, |
| | 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| | 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| | 12 | * Lesser General Public License for more details. |
| | 13 | * |
| | 14 | * You should have received a copy of the GNU Lesser General Public |
| | 15 | * License along with FFmpeg; if not, write to the Free Software |
| | 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| | 17 | */ |
| | 18 | |
| | 19 | /** |
| | 20 | * @file |
| | 21 | * XMA2 audio parser |
| | 22 | */ |
| | 23 | |
| | 24 | #include "parser.h" |
| | 25 | |
| | 26 | typedef struct XMAParserContext{ |
| | 27 | int skip_packets; |
| | 28 | } XMAParserContext; |
| | 29 | |
| | 30 | static int xma_parse(AVCodecParserContext *s1, AVCodecContext *avctx, |
| | 31 | const uint8_t **poutbuf, int *poutbuf_size, |
| | 32 | const uint8_t *buf, int buf_size) |
| | 33 | { |
| | 34 | XMAParserContext *s = s1->priv_data; |
| | 35 | |
| | 36 | if (buf_size % 2048 == 0) { |
| | 37 | int duration = 0, packet, nb_packets = buf_size / 2048; |
| | 38 | |
| | 39 | for (packet = 0; packet < nb_packets; packet++) { |
| | 40 | if (s->skip_packets == 0) { |
| | 41 | duration += buf[packet * 2048] * 128; |
| | 42 | s->skip_packets = buf[packet * 2048 + 3] + 1; |
| | 43 | } |
| | 44 | s->skip_packets--; |
| | 45 | } |
| | 46 | |
| | 47 | s1->duration = duration; |
| | 48 | s1->key_frame = !!duration; |
| | 49 | } |
| | 50 | |
| | 51 | /* always return the full packet. this parser isn't doing any splitting or |
| | 52 | combining, only packet analysis */ |
| | 53 | *poutbuf = buf; |
| | 54 | *poutbuf_size = buf_size; |
| | 55 | return buf_size; |
| | 56 | } |
| | 57 | |
| | 58 | AVCodecParser ff_xma_parser = { |
| | 59 | .codec_ids = { AV_CODEC_ID_XMA2 }, |
| | 60 | .priv_data_size = sizeof(XMAParserContext), |
| | 61 | .parser_parse = xma_parse, |
| | 62 | }; |