FFmpeg
mvcdec.c
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1 /*
2  * Silicon Graphics Motion Video Compressor 1 & 2 decoder
3  * Copyright (c) 2012 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Silicon Graphics Motion Video Compressor 1 & 2 decoder
25  */
26 
27 #include "config_components.h"
28 
29 #include "libavutil/intreadwrite.h"
30 
31 #include "avcodec.h"
32 #include "bytestream.h"
33 #include "codec_internal.h"
34 #include "decode.h"
35 
36 typedef struct MvcContext {
37  int vflip;
38 } MvcContext;
39 
40 static av_cold int mvc_decode_init(AVCodecContext *avctx)
41 {
42  MvcContext *s = avctx->priv_data;
43  int width = avctx->width;
44  int height = avctx->height;
45  int ret;
46 
47  if (avctx->codec_id == AV_CODEC_ID_MVC1) {
48  width += 3;
49  height += 3;
50  }
51  width &= ~3;
52  height &= ~3;
53  if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
54  return ret;
55 
56  avctx->pix_fmt = (avctx->codec_id == AV_CODEC_ID_MVC1) ? AV_PIX_FMT_RGB555
57  : AV_PIX_FMT_RGB32;
58  s->vflip = avctx->extradata_size >= 9 &&
59  !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9);
60  return 0;
61 }
62 
63 static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb,
64  uint8_t *dst_start, int width, int height, int linesize)
65 {
66  uint8_t *dst;
67  uint16_t v[8];
68  int mask, x, y, i;
69 
70  for (y = 0; y < height; y += 4) {
71  for (x = 0; x < width; x += 4) {
72  if (bytestream2_get_bytes_left(gb) < 6)
73  return 0;
74 
75  mask = bytestream2_get_be16u(gb);
76  v[0] = bytestream2_get_be16u(gb);
77  v[1] = bytestream2_get_be16u(gb);
78  if ((v[0] & 0x8000)) {
79  if (bytestream2_get_bytes_left(gb) < 12) {
80  av_log(avctx, AV_LOG_WARNING, "buffer overflow\n");
81  return AVERROR_INVALIDDATA;
82  }
83  for (i = 2; i < 8; i++)
84  v[i] = bytestream2_get_be16u(gb);
85  } else {
86  v[2] = v[4] = v[6] = v[0];
87  v[3] = v[5] = v[7] = v[1];
88  }
89 
90 #define PIX16(target, true, false) \
91  i = (mask & target) ? true : false; \
92  AV_WN16A(dst, v[i] & 0x7FFF); \
93  dst += 2;
94 
95 #define ROW16(row, a1, a0, b1, b0) \
96  dst = dst_start + (y + row) * linesize + x * 2; \
97  PIX16(1 << (row * 4), a1, a0) \
98  PIX16(1 << (row * 4 + 1), a1, a0) \
99  PIX16(1 << (row * 4 + 2), b1, b0) \
100  PIX16(1 << (row * 4 + 3), b1, b0)
101 
102  ROW16(0, 0, 1, 2, 3);
103  ROW16(1, 0, 1, 2, 3);
104  ROW16(2, 4, 5, 6, 7);
105  ROW16(3, 4, 5, 6, 7);
106  }
107  }
108  return 0;
109 }
110 
111 static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel)
112 {
113  int i, j;
114  for (j = 0; j < 4; j++)
115  for (i = 0; i < 4; i++)
116  AV_WN32A(dst + j * linesize + i * 4, pixel);
117 }
118 
119 #define PIX32(target, true, false) \
120  AV_WN32A(dst, (mask & target) ? v[true] : v[false]); \
121  dst += 4;
122 
123 #define ROW32(row, a1, a0, b1, b0) \
124  dst = dst_start + (y + row) * linesize + x * 4; \
125  PIX32(1 << (row * 4), a1, a0) \
126  PIX32(1 << (row * 4 + 1), a1, a0) \
127  PIX32(1 << (row * 4 + 2), b1, b0) \
128  PIX32(1 << (row * 4 + 3), b1, b0)
129 
130 #define MVC2_BLOCK \
131  ROW32(0, 1, 0, 3, 2); \
132  ROW32(1, 1, 0, 3, 2); \
133  ROW32(2, 5, 4, 7, 6); \
134  ROW32(3, 5, 4, 7, 6);
135 
136 static int decode_mvc2(AVCodecContext *avctx, GetByteContext *gb,
137  uint8_t *dst_start, int width, int height,
138  int linesize, int vflip)
139 {
140  uint8_t *dst;
141  uint32_t color[128], v[8];
142  int w, h, nb_colors, i, x, y, p0, p1, mask;
143 
144  if (bytestream2_get_bytes_left(gb) < 6)
145  return AVERROR_INVALIDDATA;
146 
147  w = bytestream2_get_be16u(gb);
148  h = bytestream2_get_be16u(gb);
149  if ((w & ~3) != width || (h & ~3) != height)
150  av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n");
151 
152  if (bytestream2_get_byteu(gb)) {
153  avpriv_request_sample(avctx, "bitmap feature");
154  return AVERROR_PATCHWELCOME;
155  }
156 
157  nb_colors = bytestream2_get_byteu(gb);
158  if (bytestream2_get_bytes_left(gb) < nb_colors * 3)
159  return AVERROR_INVALIDDATA;
160  for (i = 0; i < FFMIN(nb_colors, 128); i++)
161  color[i] = 0xFF000000 | bytestream2_get_be24u(gb);
162  if (nb_colors > 128)
163  bytestream2_skip(gb, (nb_colors - 128) * 3);
164 
165  if (vflip) {
166  dst_start += (height - 1) * linesize;
167  linesize = -linesize;
168  }
169  x = y = 0;
170  while (bytestream2_get_bytes_left(gb) >= 1) {
171  p0 = bytestream2_get_byteu(gb);
172  if ((p0 & 0x80)) {
173  if ((p0 & 0x40)) {
174  p0 &= 0x3F;
175  p0 = (p0 << 2) | (p0 >> 4);
176  set_4x4_block(dst_start + y * linesize + x * 4, linesize,
177  0xFF000000 | (p0 << 16) | (p0 << 8) | p0);
178  } else {
179  int g, r;
180  p0 &= 0x3F;
181  p0 = (p0 << 2) | (p0 >> 4);
182  if (bytestream2_get_bytes_left(gb) < 2)
183  return AVERROR_INVALIDDATA;
184  g = bytestream2_get_byteu(gb);
185  r = bytestream2_get_byteu(gb);
186  set_4x4_block(dst_start + y * linesize + x * 4, linesize,
187  0xFF000000 | (r << 16) | (g << 8) | p0);
188  }
189  } else {
190  if (bytestream2_get_bytes_left(gb) < 1)
191  return AVERROR_INVALIDDATA;
192  p1 = bytestream2_get_byteu(gb);
193  if ((p1 & 0x80)) {
194  if ((p0 & 0x7F) == (p1 & 0x7F)) {
195  set_4x4_block(dst_start + y * linesize + x * 4, linesize,
196  color[p0 & 0x7F]);
197  } else {
198  if (bytestream2_get_bytes_left(gb) < 2)
199  return AVERROR_INVALIDDATA;
200  v[0] = v[2] = v[4] = v[6] = color[p0 & 0x7F];
201  v[1] = v[3] = v[5] = v[7] = color[p1 & 0x7F];
202  mask = bytestream2_get_le16u(gb);
203  MVC2_BLOCK
204  }
205  } else {
206  if (bytestream2_get_bytes_left(gb) < 8)
207  return AVERROR_INVALIDDATA;
208  v[0] = color[p0 & 0x7F];
209  v[1] = color[p1 & 0x7F];
210  for (i = 2; i < 8; i++)
211  v[i] = color[bytestream2_get_byteu(gb) & 0x7F];
212  mask = bytestream2_get_le16u(gb);
213  MVC2_BLOCK
214  }
215  }
216 
217  x += 4;
218  if (x >= width) {
219  y += 4;
220  if (y >= height)
221  break;
222  x = 0;
223  }
224  }
225  return 0;
226 }
227 
228 static int mvc_decode_frame(AVCodecContext *avctx, AVFrame *frame,
229  int *got_frame, AVPacket *avpkt)
230 {
231  MvcContext *s = avctx->priv_data;
232  GetByteContext gb;
233  int ret;
234 
235  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
236  return ret;
237 
238  bytestream2_init(&gb, avpkt->data, avpkt->size);
239  if (avctx->codec_id == AV_CODEC_ID_MVC1)
240  ret = decode_mvc1(avctx, &gb, frame->data[0],
241  avctx->width, avctx->height, frame->linesize[0]);
242  else
243  ret = decode_mvc2(avctx, &gb, frame->data[0],
244  avctx->width, avctx->height, frame->linesize[0],
245  s->vflip);
246  if (ret < 0)
247  return ret;
248 
249  frame->pict_type = AV_PICTURE_TYPE_I;
250  frame->flags |= AV_FRAME_FLAG_KEY;
251 
252  *got_frame = 1;
253 
254  return avpkt->size;
255 }
256 
257 #if CONFIG_MVC1_DECODER
258 const FFCodec ff_mvc1_decoder = {
259  .p.name = "mvc1",
260  CODEC_LONG_NAME("Silicon Graphics Motion Video Compressor 1"),
261  .p.type = AVMEDIA_TYPE_VIDEO,
262  .p.id = AV_CODEC_ID_MVC1,
263  .priv_data_size = sizeof(MvcContext),
264  .init = mvc_decode_init,
265  FF_CODEC_DECODE_CB(mvc_decode_frame),
266  .p.capabilities = AV_CODEC_CAP_DR1,
267 };
268 #endif
269 
270 #if CONFIG_MVC2_DECODER
271 const FFCodec ff_mvc2_decoder = {
272  .p.name = "mvc2",
273  CODEC_LONG_NAME("Silicon Graphics Motion Video Compressor 2"),
274  .p.type = AVMEDIA_TYPE_VIDEO,
275  .p.id = AV_CODEC_ID_MVC2,
276  .priv_data_size = sizeof(MvcContext),
277  .init = mvc_decode_init,
278  FF_CODEC_DECODE_CB(mvc_decode_frame),
279  .p.capabilities = AV_CODEC_CAP_DR1,
280 };
281 #endif
MVC2_BLOCK
#define MVC2_BLOCK
Definition: mvcdec.c:130
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
r
const char * r
Definition: vf_curves.c:126
color
Definition: vf_paletteuse.c:511
mvc_decode_init
static av_cold int mvc_decode_init(AVCodecContext *avctx)
Definition: mvcdec.c:40
GetByteContext
Definition: bytestream.h:33
AV_CODEC_ID_MVC2
@ AV_CODEC_ID_MVC2
Definition: codec_id.h:237
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:344
w
uint8_t w
Definition: llviddspenc.c:38
AVPacket::data
uint8_t * data
Definition: packet.h:522
FFCodec
Definition: codec_internal.h:127
AV_WN32A
#define AV_WN32A(p, v)
Definition: intreadwrite.h:536
AVFrame::flags
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
Definition: frame.h:616
ff_set_dimensions
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:94
decode_mvc2
static int decode_mvc2(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize, int vflip)
Definition: mvcdec.c:136
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:365
bytestream2_skip
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
MvcContext
Definition: mvcdec.c:36
av_cold
#define av_cold
Definition: attributes.h:90
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:595
mask
static const uint16_t mask[17]
Definition: lzw.c:38
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:524
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:287
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
g
const char * g
Definition: vf_curves.c:127
decode_mvc1
static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize)
Definition: mvcdec.c:63
mvc_decode_frame
static int mvc_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: mvcdec.c:228
decode.h
set_4x4_block
static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel)
Definition: mvcdec.c:111
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
ROW16
#define ROW16(row, a1, a0, b1, b0)
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
pixel
uint8_t pixel
Definition: tiny_ssim.c:41
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:446
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1569
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
codec_internal.h
height
#define height
AV_PIX_FMT_RGB32
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:451
ff_mvc1_decoder
const FFCodec ff_mvc1_decoder
ff_mvc2_decoder
const FFCodec ff_mvc2_decoder
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:523
AV_PIX_FMT_RGB555
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:466
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::height
int height
Definition: avcodec.h:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
AV_CODEC_ID_MVC1
@ AV_CODEC_ID_MVC1
Definition: codec_id.h:236
avcodec.h
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:445
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVPacket
This structure stores compressed data.
Definition: packet.h:499
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:618
bytestream.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:389
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
h
h
Definition: vp9dsp_template.c:2038
MvcContext::vflip
int vflip
Definition: mvcdec.c:37
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