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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 | +}; |