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jvdec.c
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1 /*
2  * Bitmap Brothers JV video decoder
3  * Copyright (c) 2011 Peter Ross <pross@xvid.org>
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  * Bitmap Brothers JV video decoder
25  * @author Peter Ross <pross@xvid.org>
26  */
27 
28 #include "libavutil/intreadwrite.h"
29 
30 #include "avcodec.h"
31 #include "blockdsp.h"
32 #include "get_bits.h"
33 #include "internal.h"
34 
35 typedef struct JvContext {
40 } JvContext;
41 
43 {
44  JvContext *s = avctx->priv_data;
45 
46  if (!avctx->width || !avctx->height ||
47  (avctx->width & 7) || (avctx->height & 7)) {
48  av_log(avctx, AV_LOG_ERROR, "Invalid video dimensions: %dx%d\n",
49  avctx->width, avctx->height);
50  return AVERROR(EINVAL);
51  }
52 
53  s->frame = av_frame_alloc();
54  if (!s->frame)
55  return AVERROR(ENOMEM);
56 
57  avctx->pix_fmt = AV_PIX_FMT_PAL8;
58  ff_blockdsp_init(&s->bdsp, avctx);
59  return 0;
60 }
61 
62 /**
63  * Decode 2x2 block
64  */
65 static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
66 {
67  int i, j, v[2];
68 
69  switch (get_bits(gb, 2)) {
70  case 1:
71  v[0] = get_bits(gb, 8);
72  for (j = 0; j < 2; j++)
73  memset(dst + j * linesize, v[0], 2);
74  break;
75  case 2:
76  v[0] = get_bits(gb, 8);
77  v[1] = get_bits(gb, 8);
78  for (j = 0; j < 2; j++)
79  for (i = 0; i < 2; i++)
80  dst[j * linesize + i] = v[get_bits1(gb)];
81  break;
82  case 3:
83  for (j = 0; j < 2; j++)
84  for (i = 0; i < 2; i++)
85  dst[j * linesize + i] = get_bits(gb, 8);
86  }
87 }
88 
89 /**
90  * Decode 4x4 block
91  */
92 static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
93 {
94  int i, j, v[2];
95 
96  switch (get_bits(gb, 2)) {
97  case 1:
98  v[0] = get_bits(gb, 8);
99  for (j = 0; j < 4; j++)
100  memset(dst + j * linesize, v[0], 4);
101  break;
102  case 2:
103  v[0] = get_bits(gb, 8);
104  v[1] = get_bits(gb, 8);
105  for (j = 2; j >= 0; j -= 2) {
106  for (i = 0; i < 4; i++)
107  dst[j * linesize + i] = v[get_bits1(gb)];
108  for (i = 0; i < 4; i++)
109  dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
110  }
111  break;
112  case 3:
113  for (j = 0; j < 4; j += 2)
114  for (i = 0; i < 4; i += 2)
115  decode2x2(gb, dst + j * linesize + i, linesize);
116  }
117 }
118 
119 /**
120  * Decode 8x8 block
121  */
122 static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
123  BlockDSPContext *bdsp)
124 {
125  int i, j, v[2];
126 
127  switch (get_bits(gb, 2)) {
128  case 1:
129  v[0] = get_bits(gb, 8);
130  bdsp->fill_block_tab[1](dst, v[0], linesize, 8);
131  break;
132  case 2:
133  v[0] = get_bits(gb, 8);
134  v[1] = get_bits(gb, 8);
135  for (j = 7; j >= 0; j--)
136  for (i = 0; i < 8; i++)
137  dst[j * linesize + i] = v[get_bits1(gb)];
138  break;
139  case 3:
140  for (j = 0; j < 8; j += 4)
141  for (i = 0; i < 8; i += 4)
142  decode4x4(gb, dst + j * linesize + i, linesize);
143  }
144 }
145 
146 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
147  AVPacket *avpkt)
148 {
149  JvContext *s = avctx->priv_data;
150  const uint8_t *buf = avpkt->data;
151  const uint8_t *buf_end = buf + avpkt->size;
152  int video_size, video_type, i, j, ret;
153 
154  if (avpkt->size < 6)
155  return AVERROR_INVALIDDATA;
156 
157  video_size = AV_RL32(buf);
158  video_type = buf[4];
159  buf += 5;
160 
161  if (video_size) {
162  if (video_size < 0 || video_size > avpkt->size - 5) {
163  av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
164  return AVERROR_INVALIDDATA;
165  }
166  if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
167  return ret;
168 
169  if (video_type == 0 || video_type == 1) {
170  GetBitContext gb;
171  init_get_bits(&gb, buf, 8 * video_size);
172 
173  for (j = 0; j < avctx->height; j += 8)
174  for (i = 0; i < avctx->width; i += 8)
175  decode8x8(&gb,
176  s->frame->data[0] + j * s->frame->linesize[0] + i,
177  s->frame->linesize[0], &s->bdsp);
178 
179  buf += video_size;
180  } else if (video_type == 2) {
181  int v = *buf++;
182  for (j = 0; j < avctx->height; j++)
183  memset(s->frame->data[0] + j * s->frame->linesize[0],
184  v, avctx->width);
185  } else {
186  av_log(avctx, AV_LOG_WARNING,
187  "unsupported frame type %i\n", video_type);
188  return AVERROR_INVALIDDATA;
189  }
190  }
191 
192  if (buf_end - buf >= AVPALETTE_COUNT * 3) {
193  for (i = 0; i < AVPALETTE_COUNT; i++) {
194  uint32_t pal = AV_RB24(buf);
195  s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303);
196  buf += 3;
197  }
198  s->palette_has_changed = 1;
199  }
200 
201  if (video_size) {
202  s->frame->key_frame = 1;
205  s->palette_has_changed = 0;
206  memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
207 
208  if ((ret = av_frame_ref(data, s->frame)) < 0)
209  return ret;
210  *got_frame = 1;
211  }
212 
213  return avpkt->size;
214 }
215 
217 {
218  JvContext *s = avctx->priv_data;
219 
220  av_frame_free(&s->frame);
221 
222  return 0;
223 }
224 
226  .name = "jv",
227  .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
228  .type = AVMEDIA_TYPE_VIDEO,
229  .id = AV_CODEC_ID_JV,
230  .priv_data_size = sizeof(JvContext),
231  .init = decode_init,
232  .close = decode_close,
233  .decode = decode_frame,
234  .capabilities = AV_CODEC_CAP_DR1,
235 };
float v
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1423
static void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, BlockDSPContext *bdsp)
Decode 8x8 block.
Definition: jvdec.c:122
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1721
int palette_has_changed
Definition: jvdec.c:39
static av_cold int decode_init(AVCodecContext *avctx)
Definition: jvdec.c:42
AVCodec.
Definition: avcodec.h:3473
AVFrame * frame
Definition: jvdec.c:37
uint8_t
#define av_cold
Definition: attributes.h:74
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:135
8 bit with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:74
uint32_t palette[AVPALETTE_COUNT]
Definition: jvdec.c:38
#define AVPALETTE_SIZE
Definition: pixfmt.h:33
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:363
uint8_t * data
Definition: avcodec.h:1422
bitstream reader API header.
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:148
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
AVCodec ff_jv_decoder
Definition: jvdec.c:225
const char * name
Name of the codec implementation.
Definition: avcodec.h:3480
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: jvdec.c:146
Libavcodec external API header.
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:1087
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:242
ret
Definition: avfilter.c:974
int width
picture width / height.
Definition: avcodec.h:1680
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:87
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:58
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:199
main external API structure.
Definition: avcodec.h:1501
void * buf
Definition: avisynth_c.h:553
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:410
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:377
#define AVPALETTE_COUNT
Definition: pixfmt.h:34
static av_cold int decode_close(AVCodecContext *avctx)
Definition: jvdec.c:216
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:182
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:522
static void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
Decode 2x2 block.
Definition: jvdec.c:65
common internal api header.
static void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
Decode 4x4 block.
Definition: jvdec.c:92
void * priv_data
Definition: avcodec.h:1543
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:237
BlockDSPContext bdsp
Definition: jvdec.c:36
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1399
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:856
op_fill_func fill_block_tab[2]
Definition: blockdsp.h:38