FFmpeg
imx_dump_header_bsf.c
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1 /*
2  * imx dump header bitstream filter
3  * Copyright (c) 2007 Baptiste Coudurier
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * imx dump header bitstream filter
25  * modifies bitstream to fit in mov and be decoded by final cut pro decoder
26  */
27 
28 #include "bsf.h"
29 #include "bsf_internal.h"
30 #include "bytestream.h"
31 
32 
34 {
35  /* MXF essence element key */
36  static const uint8_t imx_header[16] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x05,0x01,0x01,0x00 };
37 
38  AVPacket *in;
39  int ret = 0;
40  uint8_t *out_buf;
41 
42  ret = ff_bsf_get_packet(ctx, &in);
43  if (ret < 0)
44  return ret;
45 
46  ret = av_new_packet(out, in->size + 20);
47  if (ret < 0)
48  goto fail;
49 
50  out_buf = out->data;
51 
52  bytestream_put_buffer(&out_buf, imx_header, 16);
53  bytestream_put_byte(&out_buf, 0x83); /* KLV BER long form */
54  bytestream_put_be24(&out_buf, in->size);
55  bytestream_put_buffer(&out_buf, in->data, in->size);
56 
58  if (ret < 0)
59  goto fail;
60 
61 fail:
62  if (ret < 0)
64  av_packet_free(&in);
65  return ret;
66 }
67 
68 static const enum AVCodecID codec_ids[] = {
70 };
71 
73  .name = "imxdump",
74  .filter = imx_dump_header,
75  .codec_ids = codec_ids,
76 };
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:403
bsf_internal.h
out
FILE * out
Definition: movenc.c:54
AVBitStreamFilter::name
const char * name
Definition: bsf.h:99
AVPacket::data
uint8_t * data
Definition: packet.h:365
ff_bsf_get_packet
int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
Called by the bitstream filters to get the next packet for filtering.
Definition: bsf.c:229
av_packet_free
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:70
AVBSFContext
The bitstream filter state.
Definition: bsf.h:49
bsf.h
fail
#define fail()
Definition: checkasm.h:134
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:94
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
codec_ids
static enum AVCodecID codec_ids[]
Definition: imx_dump_header_bsf.c:68
AVPacket::size
int size
Definition: packet.h:366
bytestream_put_buffer
static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
Definition: bytestream.h:372
av_packet_copy_props
int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
Copy only "properties" fields from src to dst.
Definition: avpacket.c:374
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
imx_dump_header
static int imx_dump_header(AVBSFContext *ctx, AVPacket *out)
Definition: imx_dump_header_bsf.c:33
ret
ret
Definition: filter_design.txt:187
AVBitStreamFilter
Definition: bsf.h:98
AVPacket
This structure stores compressed data.
Definition: packet.h:342
bytestream.h
ff_imx_dump_header_bsf
const AVBitStreamFilter ff_imx_dump_header_bsf
Definition: imx_dump_header_bsf.c:72
AV_CODEC_ID_MPEG2VIDEO
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:51