Libav
mmvideo.c
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1 /*
2  * American Laser Games MM Video Decoder
3  * Copyright (c) 2006,2008 Peter Ross
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
34 #include "libavutil/intreadwrite.h"
35 #include "avcodec.h"
36 #include "bytestream.h"
37 #include "internal.h"
38 
39 #define MM_PREAMBLE_SIZE 6
40 
41 #define MM_TYPE_INTER 0x5
42 #define MM_TYPE_INTRA 0x8
43 #define MM_TYPE_INTRA_HH 0xc
44 #define MM_TYPE_INTER_HH 0xd
45 #define MM_TYPE_INTRA_HHV 0xe
46 #define MM_TYPE_INTER_HHV 0xf
47 #define MM_TYPE_PALETTE 0x31
48 
49 typedef struct MmContext {
54 } MmContext;
55 
57 {
58  MmContext *s = avctx->priv_data;
59 
60  s->avctx = avctx;
61 
62  avctx->pix_fmt = AV_PIX_FMT_PAL8;
63 
64  s->frame = av_frame_alloc();
65  if (!s->frame)
66  return AVERROR(ENOMEM);
67 
68  return 0;
69 }
70 
71 static int mm_decode_pal(MmContext *s)
72 {
73  int i;
74 
75  bytestream2_skip(&s->gb, 4);
76  for (i = 0; i < 128; i++) {
77  s->palette[i] = bytestream2_get_be24(&s->gb);
78  s->palette[i+128] = s->palette[i]<<2;
79  }
80 
81  return 0;
82 }
83 
88 static int mm_decode_intra(MmContext * s, int half_horiz, int half_vert)
89 {
90  int x = 0, y = 0;
91 
92  while (bytestream2_get_bytes_left(&s->gb) > 0) {
93  int run_length, color;
94 
95  if (y >= s->avctx->height)
96  return 0;
97 
98  color = bytestream2_get_byte(&s->gb);
99  if (color & 0x80) {
100  run_length = 1;
101  }else{
102  run_length = (color & 0x7f) + 2;
103  color = bytestream2_get_byte(&s->gb);
104  }
105 
106  if (half_horiz)
107  run_length *=2;
108 
109  if (color) {
110  memset(s->frame->data[0] + y*s->frame->linesize[0] + x, color, run_length);
111  if (half_vert)
112  memset(s->frame->data[0] + (y+1)*s->frame->linesize[0] + x, color, run_length);
113  }
114  x+= run_length;
115 
116  if (x >= s->avctx->width) {
117  x=0;
118  y += 1 + half_vert;
119  }
120  }
121 
122  return 0;
123 }
124 
125 /*
126  * @param half_horiz Half horizontal resolution (0 or 1)
127  * @param half_vert Half vertical resolution (0 or 1)
128  */
129 static int mm_decode_inter(MmContext * s, int half_horiz, int half_vert)
130 {
131  int data_off = bytestream2_get_le16(&s->gb);
132  int y = 0;
133  GetByteContext data_ptr;
134 
135  if (bytestream2_get_bytes_left(&s->gb) < data_off)
136  return AVERROR_INVALIDDATA;
137 
138  bytestream2_init(&data_ptr, s->gb.buffer + data_off, bytestream2_get_bytes_left(&s->gb) - data_off);
139  while (s->gb.buffer < data_ptr.buffer_start) {
140  int i, j;
141  int length = bytestream2_get_byte(&s->gb);
142  int x = bytestream2_get_byte(&s->gb) + ((length & 0x80) << 1);
143  length &= 0x7F;
144 
145  if (length==0) {
146  y += x;
147  continue;
148  }
149 
150  if (y + half_vert >= s->avctx->height)
151  return 0;
152 
153  for(i=0; i<length; i++) {
154  int replace_array = bytestream2_get_byte(&s->gb);
155  for(j=0; j<8; j++) {
156  int replace = (replace_array >> (7-j)) & 1;
157  if (x + half_horiz >= s->avctx->width)
158  return AVERROR_INVALIDDATA;
159  if (replace) {
160  int color = bytestream2_get_byte(&data_ptr);
161  s->frame->data[0][y*s->frame->linesize[0] + x] = color;
162  if (half_horiz)
163  s->frame->data[0][y*s->frame->linesize[0] + x + 1] = color;
164  if (half_vert) {
165  s->frame->data[0][(y+1)*s->frame->linesize[0] + x] = color;
166  if (half_horiz)
167  s->frame->data[0][(y+1)*s->frame->linesize[0] + x + 1] = color;
168  }
169  }
170  x += 1 + half_horiz;
171  }
172  }
173 
174  y += 1 + half_vert;
175  }
176 
177  return 0;
178 }
179 
180 static int mm_decode_frame(AVCodecContext *avctx,
181  void *data, int *got_frame,
182  AVPacket *avpkt)
183 {
184  const uint8_t *buf = avpkt->data;
185  int buf_size = avpkt->size;
186  MmContext *s = avctx->priv_data;
187  int type, res;
188 
189  if (buf_size < MM_PREAMBLE_SIZE)
190  return AVERROR_INVALIDDATA;
191  type = AV_RL16(&buf[0]);
192  buf += MM_PREAMBLE_SIZE;
193  buf_size -= MM_PREAMBLE_SIZE;
194  bytestream2_init(&s->gb, buf, buf_size);
195 
196  if ((res = ff_reget_buffer(avctx, s->frame)) < 0) {
197  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
198  return res;
199  }
200 
201  switch(type) {
202  case MM_TYPE_PALETTE : res = mm_decode_pal(s); return buf_size;
203  case MM_TYPE_INTRA : res = mm_decode_intra(s, 0, 0); break;
204  case MM_TYPE_INTRA_HH : res = mm_decode_intra(s, 1, 0); break;
205  case MM_TYPE_INTRA_HHV : res = mm_decode_intra(s, 1, 1); break;
206  case MM_TYPE_INTER : res = mm_decode_inter(s, 0, 0); break;
207  case MM_TYPE_INTER_HH : res = mm_decode_inter(s, 1, 0); break;
208  case MM_TYPE_INTER_HHV : res = mm_decode_inter(s, 1, 1); break;
209  default:
210  res = AVERROR_INVALIDDATA;
211  break;
212  }
213  if (res < 0)
214  return res;
215 
216  memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
217 
218  if ((res = av_frame_ref(data, s->frame)) < 0)
219  return res;
220 
221  *got_frame = 1;
222 
223  return buf_size;
224 }
225 
227 {
228  MmContext *s = avctx->priv_data;
229 
230  av_frame_free(&s->frame);
231 
232  return 0;
233 }
234 
236  .name = "mmvideo",
237  .long_name = NULL_IF_CONFIG_SMALL("American Laser Games MM Video"),
238  .type = AVMEDIA_TYPE_VIDEO,
239  .id = AV_CODEC_ID_MMVIDEO,
240  .priv_data_size = sizeof(MmContext),
241  .init = mm_decode_init,
242  .close = mm_decode_end,
244  .capabilities = CODEC_CAP_DR1,
245 };
#define AVPALETTE_SIZE
Definition: avcodec.h:3029
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
static int mm_decode_pal(MmContext *s)
Definition: mmvideo.c:71
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
static int mm_decode_intra(MmContext *s, int half_horiz, int half_vert)
Definition: mmvideo.c:88
int size
Definition: avcodec.h:968
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1248
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:130
#define AV_RL16
Definition: intreadwrite.h:42
#define AVPALETTE_COUNT
Definition: avcodec.h:3030
#define MM_TYPE_INTER_HH
Definition: mmvideo.c:44
AVCodec.
Definition: avcodec.h:2790
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
uint8_t
#define av_cold
Definition: attributes.h:66
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:57
8 bit with PIX_FMT_RGB32 palette
Definition: pixfmt.h:76
static int mm_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mmvideo.c:180
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:188
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:967
const uint8_t * buffer
Definition: bytestream.h:33
int palette[AVPALETTE_COUNT]
Definition: mmvideo.c:52
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:159
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:69
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:149
static av_cold int mm_decode_end(AVCodecContext *avctx)
Definition: mmvideo.c:226
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
const char * name
Name of the codec implementation.
Definition: avcodec.h:2797
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: utils.c:799
#define MM_PREAMBLE_SIZE
Definition: mmvideo.c:39
int width
picture width / height.
Definition: avcodec.h:1218
#define MM_TYPE_INTER
Definition: mmvideo.c:41
AVFrame * frame
Definition: mmvideo.c:51
#define MM_TYPE_INTRA_HHV
Definition: mmvideo.c:45
#define MM_TYPE_PALETTE
Definition: mmvideo.c:47
AVCodec ff_mmvideo_decoder
Definition: mmvideo.c:235
if(ac->has_optimized_func)
static int mm_decode_inter(MmContext *s, int half_horiz, int half_vert)
Definition: mmvideo.c:129
#define MM_TYPE_INTRA_HH
Definition: mmvideo.c:43
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
main external API structure.
Definition: avcodec.h:1044
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
static av_cold int mm_decode_init(AVCodecContext *avctx)
Definition: mmvideo.c:56
const uint8_t * buffer_start
Definition: bytestream.h:33
#define MM_TYPE_INTRA
Definition: mmvideo.c:42
#define MM_TYPE_INTER_HHV
Definition: mmvideo.c:46
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
common internal api header.
GetByteContext gb
Definition: mmvideo.c:53
AVCodecContext * avctx
Definition: mmvideo.c:50
static const uint8_t color[]
Definition: log.c:55
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1086
This structure stores compressed data.
Definition: avcodec.h:944