vorbisdec: Employ proper printf format specifiers for uint_fast32_t.
[libav.git] / libavcodec / flashsvenc.c
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1/*
2 * Flash Screen Video encoder
3 * Copyright (C) 2004 Alex Beregszaszi
4 * Copyright (C) 2006 Benjamin Larsson
5 *
2912e87a 6 * This file is part of Libav.
053185c2 7 *
2912e87a 8 * Libav is free software; you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
2912e87a 13 * Libav is distributed in the hope that it will be useful,
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14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
2912e87a 19 * License along with Libav; if not, write to the Free Software
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20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/* Encoding development sponsored by http://fh-campuswien.ac.at */
24
25/**
ba87f080 26 * @file
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27 * Flash Screen Video encoder
28 * @author Alex Beregszaszi
29 * @author Benjamin Larsson
30 */
31
32/* Bitstream description
33 * The picture is divided into blocks that are zlib-compressed.
34 *
35 * The decoder is fed complete frames, the frameheader contains:
36 * 4bits of block width
37 * 12bits of frame width
38 * 4bits of block height
39 * 12bits of frame height
40 *
41 * Directly after the header are the compressed blocks. The blocks
42 * have their compressed size represented with 16bits in the beginig.
43 * If the size = 0 then the block is unchanged from the previous frame.
44 * All blocks are decompressed until the buffer is consumed.
45 *
46 * Encoding ideas, a basic encoder would just use a fixed block size.
47 * Block sizes can be multipels of 16, from 16 to 256. The blocks don't
48 * have to be quadratic. A brute force search with a set of different
49 * block sizes should give a better result than to just use a fixed size.
50 */
51
52/* TODO:
53 * Don't reencode the frame in brute force mode if the frame is a dupe. Speed up.
54 * Make the difference check faster.
55 */
56
57#include <stdio.h>
58#include <stdlib.h>
59#include <zlib.h>
60
053185c2 61#include "avcodec.h"
b2755007 62#include "put_bits.h"
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63#include "bytestream.h"
64
65
66typedef struct FlashSVContext {
67 AVCodecContext *avctx;
68 uint8_t *previous_frame;
69 AVFrame frame;
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70 int image_width, image_height;
71 int block_width, block_height;
72 uint8_t* tmpblock;
73 uint8_t* encbuffer;
74 int block_size;
75 z_stream zstream;
8736d68a 76 int last_key_frame;
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77} FlashSVContext;
78
79static int copy_region_enc(uint8_t *sptr, uint8_t *dptr,
80 int dx, int dy, int h, int w, int stride, uint8_t *pfptr) {
81 int i,j;
82 uint8_t *nsptr;
83 uint8_t *npfptr;
84 int diff = 0;
85
86 for (i = dx+h; i > dx; i--) {
87 nsptr = sptr+(i*stride)+dy*3;
88 npfptr = pfptr+(i*stride)+dy*3;
89 for (j=0 ; j<w*3 ; j++) {
90 diff |=npfptr[j]^nsptr[j];
91 dptr[j] = nsptr[j];
92 }
93 dptr += w*3;
94 }
95 if (diff)
96 return 1;
97 return 0;
98}
99
98a6fff9 100static av_cold int flashsv_encode_init(AVCodecContext *avctx)
053185c2 101{
e4141433 102 FlashSVContext *s = avctx->priv_data;
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103
104 s->avctx = avctx;
105
106 if ((avctx->width > 4095) || (avctx->height > 4095)) {
107 av_log(avctx, AV_LOG_ERROR, "Input dimensions too large, input must be max 4096x4096 !\n");
108 return -1;
109 }
110
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111 // Needed if zlib unused or init aborted before deflateInit
112 memset(&(s->zstream), 0, sizeof(z_stream));
053185c2 113
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114 s->last_key_frame=0;
115
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116 s->image_width = avctx->width;
117 s->image_height = avctx->height;
118
119 s->tmpblock = av_mallocz(3*256*256);
120 s->encbuffer = av_mallocz(s->image_width*s->image_height*3);
121
122 if (!s->tmpblock || !s->encbuffer) {
123 av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
124 return -1;
125 }
126
127 return 0;
128}
129
130
131static int encode_bitstream(FlashSVContext *s, AVFrame *p, uint8_t *buf, int buf_size,
132 int block_width, int block_height, uint8_t *previous_frame, int* I_frame) {
133
134 PutBitContext pb;
135 int h_blocks, v_blocks, h_part, v_part, i, j;
136 int buf_pos, res;
137 int pred_blocks = 0;
138
139 init_put_bits(&pb, buf, buf_size*8);
140
141 put_bits(&pb, 4, (block_width/16)-1);
142 put_bits(&pb, 12, s->image_width);
143 put_bits(&pb, 4, (block_height/16)-1);
144 put_bits(&pb, 12, s->image_height);
145 flush_put_bits(&pb);
146 buf_pos=4;
147
148 h_blocks = s->image_width / block_width;
149 h_part = s->image_width % block_width;
150 v_blocks = s->image_height / block_height;
151 v_part = s->image_height % block_height;
152
153 /* loop over all block columns */
154 for (j = 0; j < v_blocks + (v_part?1:0); j++)
155 {
156
157 int hp = j*block_height; // horiz position in frame
158 int hs = (j<v_blocks)?block_height:v_part; // size of block
159
160 /* loop over all block rows */
161 for (i = 0; i < h_blocks + (h_part?1:0); i++)
162 {
163 int wp = i*block_width; // vert position in frame
164 int ws = (i<h_blocks)?block_width:h_part; // size of block
165 int ret=Z_OK;
166 uint8_t *ptr;
167
168 ptr = buf+buf_pos;
169
170 //copy the block to the temp buffer before compression (if it differs from the previous frame's block)
171 res = copy_region_enc(p->data[0], s->tmpblock, s->image_height-(hp+hs+1), wp, hs, ws, p->linesize[0], previous_frame);
172
173 if (res || *I_frame) {
174 unsigned long zsize;
175 zsize = 3*block_width*block_height;
176 ret = compress2(ptr+2, &zsize, s->tmpblock, 3*ws*hs, 9);
177
178
179 //ret = deflateReset(&(s->zstream));
180 if (ret != Z_OK)
181 av_log(s->avctx, AV_LOG_ERROR, "error while compressing block %dx%d\n", i, j);
053185c2 182
053185c2 183 bytestream_put_be16(&ptr,(unsigned int)zsize);
8adc51f2 184 buf_pos += zsize+2;
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185 //av_log(avctx, AV_LOG_ERROR, "buf_pos = %d\n", buf_pos);
186 } else {
187 pred_blocks++;
188 bytestream_put_be16(&ptr,0);
8adc51f2 189 buf_pos += 2;
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190 }
191 }
192 }
193
194 if (pred_blocks)
195 *I_frame = 0;
196 else
197 *I_frame = 1;
198
199 return buf_pos;
200}
201
202
203static int flashsv_encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void *data)
204{
e4141433 205 FlashSVContext * const s = avctx->priv_data;
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206 AVFrame *pict = data;
207 AVFrame * const p = &s->frame;
d2bc0473 208 uint8_t *pfptr;
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209 int res;
210 int I_frame = 0;
211 int opt_w, opt_h;
212
213 *p = *pict;
214
8736d68a 215 /* First frame needs to be a keyframe */
64472fcf 216 if (avctx->frame_number == 0) {
c17a53b7 217 s->previous_frame = av_mallocz(FFABS(p->linesize[0])*s->image_height);
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218 if (!s->previous_frame) {
219 av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
220 return -1;
221 }
222 I_frame = 1;
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223 }
224
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225 if (p->linesize[0] < 0)
226 pfptr = s->previous_frame - ((s->image_height-1) * p->linesize[0]);
227 else
228 pfptr = s->previous_frame;
229
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230 /* Check the placement of keyframes */
231 if (avctx->gop_size > 0) {
232 if (avctx->frame_number >= s->last_key_frame + avctx->gop_size) {
233 I_frame = 1;
234 }
235 }
236
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237 opt_w=4;
238 opt_h=4;
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239
240 if (buf_size < s->image_width*s->image_height*3) {
241 //Conservative upper bound check for compressed data
242 av_log(avctx, AV_LOG_ERROR, "buf_size %d < %d\n", buf_size, s->image_width*s->image_height*3);
243 return -1;
244 }
245
d2bc0473 246 res = encode_bitstream(s, p, buf, buf_size, opt_w*16, opt_h*16, pfptr, &I_frame);
54353abe 247
053185c2 248 //save the current frame
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249 if(p->linesize[0] > 0)
250 memcpy(s->previous_frame, p->data[0], s->image_height*p->linesize[0]);
251 else
c17a53b7 252 memcpy(s->previous_frame, p->data[0] + p->linesize[0] * (s->image_height-1), s->image_height*FFABS(p->linesize[0]));
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253
254 //mark the frame type so the muxer can mux it correctly
255 if (I_frame) {
256 p->pict_type = FF_I_TYPE;
257 p->key_frame = 1;
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258 s->last_key_frame = avctx->frame_number;
259 av_log(avctx, AV_LOG_DEBUG, "Inserting key frame at frame %d\n",avctx->frame_number);
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260 } else {
261 p->pict_type = FF_P_TYPE;
262 p->key_frame = 0;
263 }
264
265 avctx->coded_frame = p;
266
267 return res;
268}
269
98a6fff9 270static av_cold int flashsv_encode_end(AVCodecContext *avctx)
053185c2 271{
e4141433 272 FlashSVContext *s = avctx->priv_data;
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273
274 deflateEnd(&(s->zstream));
275
276 av_free(s->encbuffer);
277 av_free(s->previous_frame);
278 av_free(s->tmpblock);
279
280 return 0;
281}
282
d36beb3f 283AVCodec ff_flashsv_encoder = {
053185c2 284 "flashsv",
72415b2a 285 AVMEDIA_TYPE_VIDEO,
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286 CODEC_ID_FLASHSV,
287 sizeof(FlashSVContext),
288 flashsv_encode_init,
289 flashsv_encode_frame,
290 flashsv_encode_end,
2ba83017 291 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_NONE},
fe4bf374 292 .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video"),
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293};
294