FFmpeg  4.4.5
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 
51  s->last_frame = av_frame_alloc();
52  s->last2_frame = av_frame_alloc();
53  if (!s->last_frame || !s->last2_frame)
54  return AVERROR(ENOMEM);
55 
56  return 0;
57 }
58 
60  const uint8_t *buf, const uint8_t *buf_end)
61 {
62  unsigned char *dst = frame->data[0];
63  int i;
64 
65  for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) {
66  memcpy(dst, buf, s->avctx->width);
67  dst += frame->linesize[0];
68  buf += s->avctx->width;
69  }
70 }
71 
72 static void cmv_motcomp(unsigned char *dst, ptrdiff_t dst_stride,
73  const unsigned char *src, ptrdiff_t src_stride,
74  int x, int y,
75  int xoffset, int yoffset,
76  int width, int height){
77  int i,j;
78 
79  for(j=y;j<y+4;j++)
80  for(i=x;i<x+4;i++)
81  {
82  if (i+xoffset>=0 && i+xoffset<width &&
83  j+yoffset>=0 && j+yoffset<height) {
84  dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset];
85  }else{
86  dst[j*dst_stride + i] = 0;
87  }
88  }
89 }
90 
91 static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf,
92  const uint8_t *buf_end)
93 {
94  const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16);
95  int x,y,i;
96 
97  i = 0;
98  for(y=0; y<s->avctx->height/4; y++)
99  for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) {
100  if (buf[i]==0xFF) {
101  unsigned char *dst = frame->data[0] + (y*4)*frame->linesize[0] + x*4;
102  if (raw+16<buf_end && *raw==0xFF) { /* intra */
103  raw++;
104  memcpy(dst, raw, 4);
105  memcpy(dst + frame->linesize[0], raw+4, 4);
106  memcpy(dst + 2 * frame->linesize[0], raw+8, 4);
107  memcpy(dst + 3 * frame->linesize[0], raw+12, 4);
108  raw+=16;
109  }else if(raw<buf_end) { /* inter using second-last frame as reference */
110  int xoffset = (*raw & 0xF) - 7;
111  int yoffset = ((*raw >> 4)) - 7;
112  if (s->last2_frame->data[0])
114  s->last2_frame->data[0], s->last2_frame->linesize[0],
115  x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
116  raw++;
117  }
118  }else{ /* inter using last frame as reference */
119  int xoffset = (buf[i] & 0xF) - 7;
120  int yoffset = ((buf[i] >> 4)) - 7;
121  if (s->last_frame->data[0])
123  s->last_frame->data[0], s->last_frame->linesize[0],
124  x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
125  }
126  i++;
127  }
128 }
129 
130 static int cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)
131 {
132  int pal_start, pal_count, i, ret, fps;
133 
134  if(buf_end - buf < 16) {
135  av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");
136  return AVERROR_INVALIDDATA;
137  }
138 
139  s->width = AV_RL16(&buf[4]);
140  s->height = AV_RL16(&buf[6]);
141 
142  if (s->width != s->avctx->width ||
143  s->height != s->avctx->height) {
144  av_frame_unref(s->last_frame);
145  av_frame_unref(s->last2_frame);
146  }
147 
148  ret = ff_set_dimensions(s->avctx, s->width, s->height);
149  if (ret < 0)
150  return ret;
151 
152  fps = AV_RL16(&buf[10]);
153  if (fps > 0)
154  s->avctx->framerate = (AVRational){ fps, 1 };
155 
156  pal_start = AV_RL16(&buf[12]);
157  pal_count = AV_RL16(&buf[14]);
158 
159  buf += 16;
160  for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
161  s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
162  buf += 3;
163  }
164 
165  return 0;
166 }
167 
168 #define EA_PREAMBLE_SIZE 8
169 #define MVIh_TAG MKTAG('M', 'V', 'I', 'h')
170 
172  void *data, int *got_frame,
173  AVPacket *avpkt)
174 {
175  const uint8_t *buf = avpkt->data;
176  int buf_size = avpkt->size;
177  CmvContext *s = avctx->priv_data;
178  const uint8_t *buf_end = buf + buf_size;
179  AVFrame *frame = data;
180  int ret;
181 
182  if (buf_end - buf < EA_PREAMBLE_SIZE)
183  return AVERROR_INVALIDDATA;
184 
185  if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) {
186  unsigned size = AV_RL32(buf + 4);
187  ret = cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end);
188  if (ret < 0)
189  return ret;
190  if (size > buf_end - buf - EA_PREAMBLE_SIZE)
191  return AVERROR_INVALIDDATA;
192  buf += size;
193  }
194 
195  if ((ret = av_image_check_size(s->width, s->height, 0, s->avctx)) < 0)
196  return ret;
197 
198  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
199  return ret;
200 
201  memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
202 
203  buf += EA_PREAMBLE_SIZE;
204  if ((buf[0]&1)) { // subtype
205  cmv_decode_inter(s, frame, buf+2, buf_end);
206  frame->key_frame = 0;
208  }else{
209  frame->key_frame = 1;
211  cmv_decode_intra(s, frame, buf+2, buf_end);
212  }
213 
214  av_frame_unref(s->last2_frame);
215  av_frame_move_ref(s->last2_frame, s->last_frame);
216  if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
217  return ret;
218 
219  *got_frame = 1;
220 
221  return buf_size;
222 }
223 
225  CmvContext *s = avctx->priv_data;
226 
227  av_frame_free(&s->last_frame);
228  av_frame_free(&s->last2_frame);
229 
230  return 0;
231 }
232 
234  .name = "eacmv",
235  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"),
236  .type = AVMEDIA_TYPE_VIDEO,
237  .id = AV_CODEC_ID_CMV,
238  .priv_data_size = sizeof(CmvContext),
240  .close = cmv_decode_end,
242  .capabilities = AV_CODEC_CAP_DR1,
243  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
244 };
#define av_cold
Definition: attributes.h:88
uint8_t
Libavcodec external API header.
#define AV_RB24
Definition: intreadwrite.h:64
#define AV_RL16
Definition: intreadwrite.h:42
#define AV_RB32
Definition: intreadwrite.h:130
#define AV_RL32
Definition: intreadwrite.h:146
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
#define s(width, name)
Definition: cbs_vp9.c:257
common internal and external API header
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1900
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
static AVFrame * frame
static int cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)
Definition: eacmv.c:130
static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf, const uint8_t *buf_end)
Definition: eacmv.c:91
static av_cold int cmv_decode_init(AVCodecContext *avctx)
Definition: eacmv.c:45
static av_cold int cmv_decode_end(AVCodecContext *avctx)
Definition: eacmv.c:224
static int cmv_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: eacmv.c:171
static void cmv_decode_intra(CmvContext *s, AVFrame *frame, const uint8_t *buf, const uint8_t *buf_end)
Definition: eacmv.c:59
#define EA_PREAMBLE_SIZE
Definition: eacmv.c:168
AVCodec ff_eacmv_decoder
Definition: eacmv.c:233
#define MVIh_TAG
Definition: eacmv.c:169
static void cmv_motcomp(unsigned char *dst, ptrdiff_t dst_stride, const unsigned char *src, ptrdiff_t src_stride, int x, int y, int xoffset, int yoffset, int width, int height)
Definition: eacmv.c:72
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:514
@ AV_CODEC_ID_CMV
Definition: codec_id.h:167
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:553
void av_frame_move_ref(AVFrame *dst, AVFrame *src)
Move everything contained in src to dst and reset src.
Definition: frame.c:582
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:443
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
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:317
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
misc image utilities
int i
Definition: input.c:407
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:49
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:84
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
const char data[16]
Definition: mxf.c:142
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
#define AVPALETTE_COUNT
Definition: pixfmt.h:33
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
main external API structure.
Definition: avcodec.h:536
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:746
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:396
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:401
This structure stores compressed data.
Definition: packet.h:346
int size
Definition: packet.h:370
uint8_t * data
Definition: packet.h:369
Rational number (pair of numerator and denominator).
Definition: rational.h:58
unsigned int palette[AVPALETTE_COUNT]
Definition: eacmv.c:42
int height
Definition: eacmv.c:41
AVFrame * last2_frame
second-last
Definition: eacmv.c:40
AVCodecContext * avctx
Definition: eacmv.c:38
AVFrame * last_frame
last
Definition: eacmv.c:39
int width
Definition: eacmv.c:41
#define av_log(a,...)
#define src
Definition: vp8dsp.c:255
#define height
#define width
int size
if(ret< 0)
Definition: vf_mcdeint.c:282