FFmpeg  2.1.1
eacmv.c
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1 /*
2  * Electronic Arts CMV Video Decoder
3  * Copyright (c) 2007-2008 Peter Ross
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 St, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Electronic Arts CMV Video Decoder
25  * by Peter Ross (pross@xvid.org)
26  *
27  * Technical details here:
28  * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_CMV
29  */
30 
31 #include "libavutil/common.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/imgutils.h"
34 #include "avcodec.h"
35 #include "internal.h"
36 
37 typedef struct CmvContext {
39  AVFrame *last_frame; ///< last
40  AVFrame *last2_frame; ///< second-last
41  int width, height;
42  unsigned int palette[AVPALETTE_COUNT];
43 } CmvContext;
44 
46  CmvContext *s = avctx->priv_data;
47 
48  s->avctx = avctx;
49  avctx->pix_fmt = AV_PIX_FMT_PAL8;
50 
53  if (!s->last_frame || !s->last2_frame) {
56  return AVERROR(ENOMEM);
57  }
58 
59  return 0;
60 }
61 
63  const uint8_t *buf, const uint8_t *buf_end)
64 {
65  unsigned char *dst = frame->data[0];
66  int i;
67 
68  for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) {
69  memcpy(dst, buf, s->avctx->width);
70  dst += frame->linesize[0];
71  buf += s->avctx->width;
72  }
73 }
74 
75 static void cmv_motcomp(unsigned char *dst, int dst_stride,
76  const unsigned char *src, int src_stride,
77  int x, int y,
78  int xoffset, int yoffset,
79  int width, int height){
80  int i,j;
81 
82  for(j=y;j<y+4;j++)
83  for(i=x;i<x+4;i++)
84  {
85  if (i+xoffset>=0 && i+xoffset<width &&
86  j+yoffset>=0 && j+yoffset<height) {
87  dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset];
88  }else{
89  dst[j*dst_stride + i] = 0;
90  }
91  }
92 }
93 
95  const uint8_t *buf_end)
96 {
97  const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16);
98  int x,y,i;
99 
100  i = 0;
101  for(y=0; y<s->avctx->height/4; y++)
102  for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) {
103  if (buf[i]==0xFF) {
104  unsigned char *dst = frame->data[0] + (y*4)*frame->linesize[0] + x*4;
105  if (raw+16<buf_end && *raw==0xFF) { /* intra */
106  raw++;
107  memcpy(dst, raw, 4);
108  memcpy(dst + frame->linesize[0], raw+4, 4);
109  memcpy(dst + 2 * frame->linesize[0], raw+8, 4);
110  memcpy(dst + 3 * frame->linesize[0], raw+12, 4);
111  raw+=16;
112  }else if(raw<buf_end) { /* inter using second-last frame as reference */
113  int xoffset = (*raw & 0xF) - 7;
114  int yoffset = ((*raw >> 4)) - 7;
115  if (s->last2_frame->data[0])
116  cmv_motcomp(frame->data[0], frame->linesize[0],
117  s->last2_frame->data[0], s->last2_frame->linesize[0],
118  x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
119  raw++;
120  }
121  }else{ /* inter using last frame as reference */
122  int xoffset = (buf[i] & 0xF) - 7;
123  int yoffset = ((buf[i] >> 4)) - 7;
124  if (s->last_frame->data[0])
125  cmv_motcomp(frame->data[0], frame->linesize[0],
126  s->last_frame->data[0], s->last_frame->linesize[0],
127  x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
128  }
129  i++;
130  }
131 }
132 
133 static void cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)
134 {
135  int pal_start, pal_count, i;
136 
137  if(buf_end - buf < 16) {
138  av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");
139  return;
140  }
141 
142  s->width = AV_RL16(&buf[4]);
143  s->height = AV_RL16(&buf[6]);
144  if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
148  }
149 
150  s->avctx->time_base.num = 1;
151  s->avctx->time_base.den = AV_RL16(&buf[10]);
152 
153  pal_start = AV_RL16(&buf[12]);
154  pal_count = AV_RL16(&buf[14]);
155 
156  buf += 16;
157  for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
158  s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
159  buf += 3;
160  }
161 }
162 
163 #define EA_PREAMBLE_SIZE 8
164 #define MVIh_TAG MKTAG('M', 'V', 'I', 'h')
165 
167  void *data, int *got_frame,
168  AVPacket *avpkt)
169 {
170  const uint8_t *buf = avpkt->data;
171  int buf_size = avpkt->size;
172  CmvContext *s = avctx->priv_data;
173  const uint8_t *buf_end = buf + buf_size;
174  AVFrame *frame = data;
175  int ret;
176 
177  if (buf_end - buf < EA_PREAMBLE_SIZE)
178  return AVERROR_INVALIDDATA;
179 
180  if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) {
181  unsigned size = AV_RL32(buf + 4);
182  cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end);
183  if (size > buf_end - buf - EA_PREAMBLE_SIZE)
184  return -1;
185  buf += size;
186  }
187 
188  if (av_image_check_size(s->width, s->height, 0, s->avctx))
189  return -1;
190 
191  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
192  return ret;
193 
194  memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
195 
196  buf += EA_PREAMBLE_SIZE;
197  if ((buf[0]&1)) { // subtype
198  cmv_decode_inter(s, frame, buf+2, buf_end);
199  frame->key_frame = 0;
200  frame->pict_type = AV_PICTURE_TYPE_P;
201  }else{
202  frame->key_frame = 1;
203  frame->pict_type = AV_PICTURE_TYPE_I;
204  cmv_decode_intra(s, frame, buf+2, buf_end);
205  }
206 
209  if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
210  return ret;
211 
212  *got_frame = 1;
213 
214  return buf_size;
215 }
216 
218  CmvContext *s = avctx->priv_data;
219 
222 
223  return 0;
224 }
225 
227  .name = "eacmv",
228  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"),
229  .type = AVMEDIA_TYPE_VIDEO,
230  .id = AV_CODEC_ID_CMV,
231  .priv_data_size = sizeof(CmvContext),
235  .capabilities = CODEC_CAP_DR1,
236 };
#define MVIh_TAG
Definition: eacmv.c:164
int width
Definition: eacmv.c:41
const char * s
Definition: avisynth_c.h:668
int size
This structure describes decoded (raw) audio or video data.
Definition: frame.h:96
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: avcodec.h:4153
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define AV_RL16(x)
Definition: intreadwrite.h:245
int num
numerator
Definition: rational.h:44
void avcodec_set_dimensions(AVCodecContext *s, int width, int height)
Definition: utils.c:233
int size
Definition: avcodec.h:1064
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1342
AVCodec.
Definition: avcodec.h:2922
#define av_cold
Definition: avcodec.h:653
Predicted.
Definition: avcodec.h:2305
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1265
if((e=av_dict_get(options,"", NULL, AV_DICT_IGNORE_SUFFIX)))
Definition: avfilter.c:965
unsigned int palette[AVPALETTE_COUNT]
Definition: eacmv.c:42
uint8_t
const char * name
Name of the codec implementation.
Definition: avcodec.h:2929
int av_frame_ref(AVFrame *dst, AVFrame *src)
Setup a new reference to the data described by a given frame.
Definition: frame.c:247
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:742
const char data[16]
Definition: mxf.c:68
static AVFrame * frame
Definition: demuxing.c:51
#define U(x)
Definition: vp56_arith.h:37
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:110
AVCodec ff_eacmv_decoder
Definition: eacmv.c:226
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:123
#define AVPALETTE_COUNT
Definition: avcodec.h:4500
Libavcodec external API header.
int height
Definition: eacmv.c:41
static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf, const uint8_t *buf_end)
Definition: eacmv.c:94
static av_cold int cmv_decode_init(AVCodecContext *avctx)
Definition: eacmv.c:45
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:231
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:167
static int cmv_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: eacmv.c:166
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:351
float y
ret
Definition: avfilter.c:961
int width
picture width / height.
Definition: avcodec.h:1314
static void cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)
Definition: eacmv.c:133
#define AVPALETTE_SIZE
Definition: avcodec.h:4499
AVFrame * last_frame
last
Definition: eacmv.c:39
static void cmv_motcomp(unsigned char *dst, int dst_stride, const unsigned char *src, int src_stride, int x, int y, int xoffset, int yoffset, int width, int height)
Definition: eacmv.c:75
static int width
Definition: utils.c:158
AVCodecContext * avctx
Definition: eacmv.c:38
AVS_Value src
Definition: avisynth_c.h:523
main external API structure.
Definition: avcodec.h:1146
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:538
void av_frame_move_ref(AVFrame *dst, AVFrame *src)
Move everythnig contained in src to dst and reset src.
Definition: frame.c:373
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:941
void * buf
Definition: avisynth_c.h:594
BYTE int const BYTE int int int height
Definition: avisynth_c.h:713
uint8_t * data
Definition: avcodec.h:1063
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:124
static void cmv_decode_intra(CmvContext *s, AVFrame *frame, const uint8_t *buf, const uint8_t *buf_end)
Definition: eacmv.c:62
#define AV_RB24(x)
Definition: intreadwrite.h:436
void * priv_data
Definition: avcodec.h:1182
AVFrame * last2_frame
second-last
Definition: eacmv.c:40
common internal api header.
int den
denominator
Definition: rational.h:45
#define AV_RB32(x)
Definition: intreadwrite.h:258
#define AVERROR_INVALIDDATA
#define AV_RL32(x)
Definition: intreadwrite.h:275
int key_frame
1 -&gt; keyframe, 0-&gt; not
Definition: frame.h:162
#define AVERROR(e)
static int decode(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: crystalhd.c:868
8 bit with PIX_FMT_RGB32 palette
Definition: avcodec.h:4545
This structure stores compressed data.
Definition: avcodec.h:1040
static av_cold int cmv_decode_end(AVCodecContext *avctx)
Definition: eacmv.c:217
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:910
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:107
#define EA_PREAMBLE_SIZE
Definition: eacmv.c:163