FFmpeg
sp5xdec.c
Go to the documentation of this file.
1 /*
2  * Sunplus JPEG decoder (SP5X)
3  * Copyright (c) 2003 Alex Beregszaszi
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  * Sunplus JPEG decoder (SP5X).
25  */
26 
27 #include "config_components.h"
28 
29 #include "avcodec.h"
30 #include "codec_internal.h"
31 #include "mjpeg.h"
32 #include "mjpegdec.h"
33 #include "sp5x.h"
34 
35 
37  AVFrame *frame, int *got_frame,
38  AVPacket *avpkt)
39 {
40  const uint8_t *buf = avpkt->data;
41  int buf_size = avpkt->size;
42  uint8_t *recoded;
43  int i = 0, j = 0;
44  int ret;
45 
46  if (!avctx->width || !avctx->height)
47  return -1;
48 
49  recoded = av_mallocz(buf_size + 1024);
50  if (!recoded)
51  return -1;
52 
53  /* SOI */
54  recoded[j++] = 0xFF;
55  recoded[j++] = 0xD8;
56 
57  memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
58  memcpy(recoded + j + 5, &sp5x_qscale_five_quant_table[0], 64);
59  memcpy(recoded + j + 70, &sp5x_qscale_five_quant_table[1], 64);
60  j += sizeof(sp5x_data_dqt);
61 
62  memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
63  j += sizeof(sp5x_data_dht);
64 
65  memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
66  AV_WB16(recoded+j+5, avctx->coded_height);
67  AV_WB16(recoded+j+7, avctx->coded_width);
68  j += sizeof(sp5x_data_sof);
69 
70  memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
71  j += sizeof(sp5x_data_sos);
72 
73  if(avctx->codec_id==AV_CODEC_ID_AMV)
74  for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
75  recoded[j++] = buf[i];
76  else
77  for (i = 14; i < buf_size && j < buf_size+1024-3; i++)
78  {
79  recoded[j++] = buf[i];
80  if (buf[i] == 0xff)
81  recoded[j++] = 0;
82  }
83 
84  /* EOI */
85  recoded[j++] = 0xFF;
86  recoded[j++] = 0xD9;
87 
88  ret = ff_mjpeg_decode_frame_from_buf(avctx, frame, got_frame,
89  avpkt, recoded, j);
90 
91  av_free(recoded);
92 
93  return ret < 0 ? ret : avpkt->size;
94 }
95 
96 #if CONFIG_SP5X_DECODER
97 const FFCodec ff_sp5x_decoder = {
98  .p.name = "sp5x",
99  CODEC_LONG_NAME("Sunplus JPEG (SP5X)"),
100  .p.type = AVMEDIA_TYPE_VIDEO,
101  .p.id = AV_CODEC_ID_SP5X,
102  .priv_data_size = sizeof(MJpegDecodeContext),
104  .close = ff_mjpeg_decode_end,
106  .p.capabilities = AV_CODEC_CAP_DR1,
107  .p.max_lowres = 3,
108  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
109 };
110 #endif
111 #if CONFIG_AMV_DECODER
112 const FFCodec ff_amv_decoder = {
113  .p.name = "amv",
114  CODEC_LONG_NAME("AMV Video"),
115  .p.type = AVMEDIA_TYPE_VIDEO,
116  .p.id = AV_CODEC_ID_AMV,
117  .priv_data_size = sizeof(MJpegDecodeContext),
119  .close = ff_mjpeg_decode_end,
121  .p.max_lowres = 3,
122  .p.capabilities = AV_CODEC_CAP_DR1,
123  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
124 };
125 #endif
mjpeg.h
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
sp5x_data_sos
static const uint8_t sp5x_data_sos[]
Definition: sp5x.h:40
mjpegdec.h
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
AVPacket::data
uint8_t * data
Definition: packet.h:522
ff_sp5x_decoder
const FFCodec ff_sp5x_decoder
FFCodec
Definition: codec_internal.h:127
sp5x.h
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
ff_mjpeg_decode_init
av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
Definition: mjpegdec.c:124
ff_amv_decoder
const FFCodec ff_amv_decoder
ff_mjpeg_decode_frame_from_buf
int ff_mjpeg_decode_frame_from_buf(AVCodecContext *avctx, AVFrame *frame, int *got_frame, const AVPacket *avpkt, const uint8_t *buf, const int buf_size)
Definition: mjpegdec.c:2371
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:640
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:306
ff_mjpeg_decode_end
av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
Definition: mjpegdec.c:2934
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:272
frame
static AVFrame * frame
Definition: demux_decode.c:54
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:455
AV_CODEC_ID_SP5X
@ AV_CODEC_ID_SP5X
Definition: codec_id.h:62
AV_WB16
#define AV_WB16(p, v)
Definition: intreadwrite.h:403
MJpegDecodeContext
Definition: mjpegdec.h:54
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:365
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:523
sp5x_data_sof
static const uint8_t sp5x_data_sof[]
Definition: sp5x.h:27
codec_internal.h
sp5x_data_dqt
static const uint8_t sp5x_data_dqt[]
Definition: sp5x.h:53
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:245
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:254
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::height
int height
Definition: avcodec.h:625
avcodec.h
ret
ret
Definition: filter_design.txt:187
sp5x_decode_frame
static int sp5x_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: sp5xdec.c:36
AV_CODEC_ID_AMV
@ AV_CODEC_ID_AMV
Definition: codec_id.h:159
AVCodecContext
main external API structure.
Definition: avcodec.h:445
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:640
sp5x_data_dht
static const uint8_t sp5x_data_dht[]
Definition: sp5x.h:77
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
AVPacket
This structure stores compressed data.
Definition: packet.h:499
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:625
sp5x_qscale_five_quant_table
static const uint8_t sp5x_qscale_five_quant_table[][64]
Definition: sp5x.h:135