FFmpeg  4.4.5
arbc.c
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1 /*
2  * Gryphon's Anim Compressor decoder
3  * Copyright (c) 2019 Paul B Mahol
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 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 
26 #include "libavutil/imgutils.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/mem.h"
30 
31 #include "avcodec.h"
32 #include "bytestream.h"
33 #include "internal.h"
34 
35 typedef struct ARBCContext {
37 
39 } ARBCContext;
40 
41 static int fill_tile4(AVCodecContext *avctx, int color, AVFrame *frame)
42 {
43  ARBCContext *s = avctx->priv_data;
44  GetByteContext *gb = &s->gb;
45  int nb_tiles = bytestream2_get_le16(gb);
46  int h = avctx->height - 1;
47  int pixels_overwritten = 0;
48 
49  if ((avctx->width / 4 + 1) * (avctx->height / 4 + 1) < nb_tiles)
50  return 0;
51 
52  for (int i = 0; i < nb_tiles; i++) {
53  int y = bytestream2_get_byte(gb);
54  int x = bytestream2_get_byte(gb);
55  uint16_t mask = bytestream2_get_le16(gb);
56  int start_y = y * 4, start_x = x * 4;
57  int end_y = start_y + 4, end_x = start_x + 4;
58 
59  for (int j = start_y; j < end_y; j++) {
60  for (int k = start_x; k < end_x; k++) {
61  if (mask & 0x8000) {
62  if (j >= avctx->height || k >= avctx->width) {
63  mask = mask << 1;
64  continue;
65  }
66  AV_WB24(&frame->data[0][frame->linesize[0] * (h - j) + 3 * k], color);
67  pixels_overwritten ++;
68  }
69  mask = mask << 1;
70  }
71  }
72  }
73  return pixels_overwritten;
74 }
75 
76 static int fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height,
77  int color, AVFrame *frame)
78 {
79  ARBCContext *s = avctx->priv_data;
80  GetByteContext *gb = &s->gb;
81  const int step_h = tile_height / 4;
82  const int step_w = tile_width / 4;
83  int nb_tiles = bytestream2_get_le16(gb);
84  int h = avctx->height - 1;
85  int pixels_overwritten = 0;
86 
87  if ((avctx->width / tile_width + 1) * (avctx->height / tile_height + 1) < nb_tiles)
88  return 0;
89 
90  for (int i = 0; i < nb_tiles; i++) {
91  int y = bytestream2_get_byte(gb);
92  int x = bytestream2_get_byte(gb);
93  uint16_t mask = bytestream2_get_le16(gb);
94  int start_y = y * tile_height, start_x = x * tile_width;
95  int end_y = start_y + tile_height, end_x = start_x + tile_width;
96 
97  if (start_x >= avctx->width || start_y >= avctx->height)
98  continue;
99 
100  for (int j = start_y; j < end_y; j += step_h) {
101  for (int k = start_x; k < end_x; k += step_w) {
102  if (mask & 0x8000U) {
103  for (int m = 0; m < step_h; m++) {
104  for (int n = 0; n < step_w; n++) {
105  if (j + m >= avctx->height || k + n >= avctx->width)
106  continue;
107  AV_WB24(&frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n)], color);
108  }
109  }
110  pixels_overwritten += FFMIN(step_h, avctx->height - j) * FFMIN(step_w, avctx->width - k);
111  }
112  mask = mask << 1;
113  }
114  }
115  }
116  return pixels_overwritten;
117 }
118 
119 static int decode_frame(AVCodecContext *avctx, void *data,
120  int *got_frame, AVPacket *avpkt)
121 {
122  ARBCContext *s = avctx->priv_data;
123  AVFrame *frame = data;
124  int ret, nb_segments;
125  int prev_pixels = avctx->width * avctx->height;
126 
127  if (avpkt->size < 10)
128  return AVERROR_INVALIDDATA;
129 
130  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
131  bytestream2_skip(&s->gb, 8);
132  nb_segments = bytestream2_get_le16(&s->gb);
133  if (nb_segments == 0)
134  return avpkt->size;
135 
136  if (7 * nb_segments > bytestream2_get_bytes_left(&s->gb))
137  return AVERROR_INVALIDDATA;
138 
139  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
140  return ret;
141 
142  if (s->prev_frame->data[0]) {
143  ret = av_frame_copy(frame, s->prev_frame);
144  if (ret < 0)
145  return ret;
146  }
147 
148  for (int i = 0; i < nb_segments; i++) {
149  int resolution_flag;
150  int fill;
151 
152  if (bytestream2_get_bytes_left(&s->gb) <= 0)
153  return AVERROR_INVALIDDATA;
154 
155  fill = bytestream2_get_byte(&s->gb) << 16;
156  bytestream2_skip(&s->gb, 1);
157  fill |= bytestream2_get_byte(&s->gb) << 8;
158  bytestream2_skip(&s->gb, 1);
159  fill |= bytestream2_get_byte(&s->gb) << 0;
160  bytestream2_skip(&s->gb, 1);
161  resolution_flag = bytestream2_get_byte(&s->gb);
162 
163  if (resolution_flag & 0x10)
164  prev_pixels -= fill_tileX(avctx, 1024, 1024, fill, frame);
165  if (resolution_flag & 0x08)
166  prev_pixels -= fill_tileX(avctx, 256, 256, fill, frame);
167  if (resolution_flag & 0x04)
168  prev_pixels -= fill_tileX(avctx, 64, 64, fill, frame);
169  if (resolution_flag & 0x02)
170  prev_pixels -= fill_tileX(avctx, 16, 16, fill, frame);
171  if (resolution_flag & 0x01)
172  prev_pixels -= fill_tile4(avctx, fill, frame);
173  }
174 
175  av_frame_unref(s->prev_frame);
176  if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
177  return ret;
178 
179  frame->pict_type = prev_pixels <= 0 ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
180  frame->key_frame = prev_pixels <= 0;
181  *got_frame = 1;
182 
183  return avpkt->size;
184 }
185 
187 {
188  ARBCContext *s = avctx->priv_data;
189 
190  avctx->pix_fmt = AV_PIX_FMT_RGB24;
191 
192  s->prev_frame = av_frame_alloc();
193  if (!s->prev_frame)
194  return AVERROR(ENOMEM);
195 
196  return 0;
197 }
198 
199 static void decode_flush(AVCodecContext *avctx)
200 {
201  ARBCContext *s = avctx->priv_data;
202 
203  av_frame_unref(s->prev_frame);
204 }
205 
207 {
208  ARBCContext *s = avctx->priv_data;
209 
210  av_frame_free(&s->prev_frame);
211 
212  return 0;
213 }
214 
216  .name = "arbc",
217  .long_name = NULL_IF_CONFIG_SMALL("Gryphon's Anim Compressor"),
218  .type = AVMEDIA_TYPE_VIDEO,
219  .id = AV_CODEC_ID_ARBC,
220  .priv_data_size = sizeof(ARBCContext),
221  .init = decode_init,
222  .decode = decode_frame,
223  .flush = decode_flush,
224  .close = decode_close,
225  .capabilities = AV_CODEC_CAP_DR1,
226  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
227 };
static void flush(AVCodecContext *avctx)
static av_cold int decode_close(AVCodecContext *avctx)
Definition: arbc.c:206
static int fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height, int color, AVFrame *frame)
Definition: arbc.c:76
static av_cold int decode_init(AVCodecContext *avctx)
Definition: arbc.c:186
AVCodec ff_arbc_decoder
Definition: arbc.c:215
static int fill_tile4(AVCodecContext *avctx, int color, AVFrame *frame)
Definition: arbc.c:41
static void decode_flush(AVCodecContext *avctx)
Definition: arbc.c:199
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: arbc.c:119
#define av_cold
Definition: attributes.h:88
Libavcodec external API header.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
#define s(width, name)
Definition: cbs_vp9.c:257
#define FFMIN(a, b)
Definition: common.h:105
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
#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_ARBC
Definition: codec_id.h:292
#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
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
int av_frame_copy(AVFrame *dst, const AVFrame *src)
Copy the frame data from src to dst.
Definition: frame.c:799
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
@ 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 AV_WB24(p, d)
Definition: intreadwrite.h:450
#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
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
static const uint16_t mask[17]
Definition: lzw.c:38
Memory handling functions.
const char data[16]
Definition: mxf.c:142
@ AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
AVFrame * prev_frame
Definition: arbc.c:38
GetByteContext gb
Definition: arbc.c:36
main external API structure.
Definition: avcodec.h:536
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:746
int width
picture width / height.
Definition: avcodec.h:709
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