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63 lines
1.9 KiB
63 lines
1.9 KiB
8 years ago
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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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* XMA2 audio parser
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*/
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#include "parser.h"
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typedef struct XMAParserContext{
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int skip_packets;
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} XMAParserContext;
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static int xma_parse(AVCodecParserContext *s1, 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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XMAParserContext *s = s1->priv_data;
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if (buf_size % 2048 == 0) {
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int duration = 0, packet, nb_packets = buf_size / 2048;
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for (packet = 0; packet < nb_packets; packet++) {
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if (s->skip_packets == 0) {
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duration += buf[packet * 2048] * 128;
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s->skip_packets = buf[packet * 2048 + 3] + 1;
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}
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s->skip_packets--;
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}
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s1->duration = duration;
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s1->key_frame = !!duration;
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}
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/* always return the full packet. this parser isn't doing any splitting or
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combining, only packet analysis */
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return buf_size;
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}
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AVCodecParser ff_xma_parser = {
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.codec_ids = { AV_CODEC_ID_XMA2 },
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.priv_data_size = sizeof(XMAParserContext),
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.parser_parse = xma_parse,
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};
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