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libavcodec/imx_dump_header_bsf.c

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00001 /*
00002  * imx dump header bitstream filter
00003  * Copyright (c) 2007 Baptiste Coudurier
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00028 #include "avcodec.h"
00029 #include "bytestream.h"
00030 
00031 
00032 static int imx_dump_header(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
00033                            uint8_t **poutbuf, int *poutbuf_size,
00034                            const uint8_t *buf, int buf_size, int keyframe)
00035 {
00036     /* MXF essence element key */
00037     static const uint8_t imx_header[16] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x05,0x01,0x01,0x00 };
00038     uint8_t *poutbufp;
00039 
00040     if (avctx->codec_id != CODEC_ID_MPEG2VIDEO) {
00041         av_log(avctx, AV_LOG_ERROR, "imx bitstream filter only applies to mpeg2video codec\n");
00042         return 0;
00043     }
00044 
00045     *poutbuf = av_malloc(buf_size + 20 + FF_INPUT_BUFFER_PADDING_SIZE);
00046     poutbufp = *poutbuf;
00047     bytestream_put_buffer(&poutbufp, imx_header, 16);
00048     bytestream_put_byte(&poutbufp, 0x83); /* KLV BER long form */
00049     bytestream_put_be24(&poutbufp, buf_size);
00050     bytestream_put_buffer(&poutbufp, buf, buf_size);
00051     *poutbuf_size = poutbufp - *poutbuf;
00052     return 1;
00053 }
00054 
00055 AVBitStreamFilter imx_dump_header_bsf = {
00056     "imxdump",
00057     0,
00058     imx_dump_header,
00059 };

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