Fix av_dlog invocations with wrong or missing logging context.
[libav.git] / libavcodec / flashsvenc.c
1 /*
2 * Flash Screen Video encoder
3 * Copyright (C) 2004 Alex Beregszaszi
4 * Copyright (C) 2006 Benjamin Larsson
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
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 *
13 * Libav is distributed in the hope that it will be useful,
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
19 * License along with Libav; if not, write to the Free Software
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 /**
26 * @file
27 * Flash Screen Video encoder
28 * @author Alex Beregszaszi
29 * @author Benjamin Larsson
30 *
31 * A description of the bitstream format for Flash Screen Video version 1/2
32 * is part of the SWF File Format Specification (version 10), which can be
33 * downloaded from http://www.adobe.com/devnet/swf.html.
34 */
35
36 /*
37 * Encoding ideas: A basic encoder would just use a fixed block size.
38 * Block sizes can be multiples of 16, from 16 to 256. The blocks don't
39 * have to be quadratic. A brute force search with a set of different
40 * block sizes should give a better result than to just use a fixed size.
41 *
42 * TODO:
43 * Don't reencode the frame in brute force mode if the frame is a dupe.
44 * Speed up. Make the difference check faster.
45 */
46
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <zlib.h>
50
51 #include "avcodec.h"
52 #include "put_bits.h"
53 #include "bytestream.h"
54
55
56 typedef struct FlashSVContext {
57 AVCodecContext *avctx;
58 uint8_t *previous_frame;
59 AVFrame frame;
60 int image_width, image_height;
61 int block_width, block_height;
62 uint8_t *tmpblock;
63 uint8_t *encbuffer;
64 int block_size;
65 z_stream zstream;
66 int last_key_frame;
67 } FlashSVContext;
68
69 static int copy_region_enc(uint8_t *sptr, uint8_t *dptr, int dx, int dy,
70 int h, int w, int stride, uint8_t *pfptr)
71 {
72 int i, j;
73 uint8_t *nsptr;
74 uint8_t *npfptr;
75 int diff = 0;
76
77 for (i = dx + h; i > dx; i--) {
78 nsptr = sptr + i * stride + dy * 3;
79 npfptr = pfptr + i * stride + dy * 3;
80 for (j = 0; j < w * 3; j++) {
81 diff |= npfptr[j] ^ nsptr[j];
82 dptr[j] = nsptr[j];
83 }
84 dptr += w * 3;
85 }
86 if (diff)
87 return 1;
88 return 0;
89 }
90
91 static av_cold int flashsv_encode_init(AVCodecContext *avctx)
92 {
93 FlashSVContext *s = avctx->priv_data;
94
95 s->avctx = avctx;
96
97 if (avctx->width > 4095 || avctx->height > 4095) {
98 av_log(avctx, AV_LOG_ERROR,
99 "Input dimensions too large, input must be max 4096x4096 !\n");
100 return AVERROR_INVALIDDATA;
101 }
102
103 // Needed if zlib unused or init aborted before deflateInit
104 memset(&s->zstream, 0, sizeof(z_stream));
105
106 s->last_key_frame = 0;
107
108 s->image_width = avctx->width;
109 s->image_height = avctx->height;
110
111 s->tmpblock = av_mallocz(3 * 256 * 256);
112 s->encbuffer = av_mallocz(s->image_width * s->image_height * 3);
113
114 if (!s->tmpblock || !s->encbuffer) {
115 av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
116 return AVERROR(ENOMEM);
117 }
118
119 return 0;
120 }
121
122
123 static int encode_bitstream(FlashSVContext *s, AVFrame *p, uint8_t *buf,
124 int buf_size, int block_width, int block_height,
125 uint8_t *previous_frame, int *I_frame)
126 {
127
128 PutBitContext pb;
129 int h_blocks, v_blocks, h_part, v_part, i, j;
130 int buf_pos, res;
131 int pred_blocks = 0;
132
133 init_put_bits(&pb, buf, buf_size * 8);
134
135 put_bits(&pb, 4, block_width / 16 - 1);
136 put_bits(&pb, 12, s->image_width);
137 put_bits(&pb, 4, block_height / 16 - 1);
138 put_bits(&pb, 12, s->image_height);
139 flush_put_bits(&pb);
140 buf_pos = 4;
141
142 h_blocks = s->image_width / block_width;
143 h_part = s->image_width % block_width;
144 v_blocks = s->image_height / block_height;
145 v_part = s->image_height % block_height;
146
147 /* loop over all block columns */
148 for (j = 0; j < v_blocks + (v_part ? 1 : 0); j++) {
149
150 int y_pos = j * block_height; // vertical position in frame
151 int cur_blk_height = (j < v_blocks) ? block_height : v_part;
152
153 /* loop over all block rows */
154 for (i = 0; i < h_blocks + (h_part ? 1 : 0); i++) {
155 int x_pos = i * block_width; // horizontal position in frame
156 int cur_blk_width = (i < h_blocks) ? block_width : h_part;
157 int ret = Z_OK;
158 uint8_t *ptr = buf + buf_pos;
159
160 /* copy the block to the temp buffer before compression
161 * (if it differs from the previous frame's block) */
162 res = copy_region_enc(p->data[0], s->tmpblock,
163 s->image_height - (y_pos + cur_blk_height + 1),
164 x_pos, cur_blk_height, cur_blk_width,
165 p->linesize[0], previous_frame);
166
167 if (res || *I_frame) {
168 unsigned long zsize = 3 * block_width * block_height;
169 ret = compress2(ptr + 2, &zsize, s->tmpblock,
170 3 * cur_blk_width * cur_blk_height, 9);
171
172 //ret = deflateReset(&s->zstream);
173 if (ret != Z_OK)
174 av_log(s->avctx, AV_LOG_ERROR,
175 "error while compressing block %dx%d\n", i, j);
176
177 bytestream_put_be16(&ptr, zsize);
178 buf_pos += zsize + 2;
179 av_dlog(s->avctx, "buf_pos = %d\n", buf_pos);
180 } else {
181 pred_blocks++;
182 bytestream_put_be16(&ptr, 0);
183 buf_pos += 2;
184 }
185 }
186 }
187
188 if (pred_blocks)
189 *I_frame = 0;
190 else
191 *I_frame = 1;
192
193 return buf_pos;
194 }
195
196
197 static int flashsv_encode_frame(AVCodecContext *avctx, uint8_t *buf,
198 int buf_size, void *data)
199 {
200 FlashSVContext * const s = avctx->priv_data;
201 AVFrame *pict = data;
202 AVFrame * const p = &s->frame;
203 uint8_t *pfptr;
204 int res;
205 int I_frame = 0;
206 int opt_w = 4, opt_h = 4;
207
208 *p = *pict;
209
210 /* First frame needs to be a keyframe */
211 if (avctx->frame_number == 0) {
212 s->previous_frame = av_mallocz(FFABS(p->linesize[0]) * s->image_height);
213 if (!s->previous_frame) {
214 av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
215 return AVERROR(ENOMEM);
216 }
217 I_frame = 1;
218 }
219
220 if (p->linesize[0] < 0)
221 pfptr = s->previous_frame - (s->image_height - 1) * p->linesize[0];
222 else
223 pfptr = s->previous_frame;
224
225 /* Check the placement of keyframes */
226 if (avctx->gop_size > 0 &&
227 avctx->frame_number >= s->last_key_frame + avctx->gop_size) {
228 I_frame = 1;
229 }
230
231 if (buf_size < s->image_width * s->image_height * 3) {
232 //Conservative upper bound check for compressed data
233 av_log(avctx, AV_LOG_ERROR, "buf_size %d < %d\n",
234 buf_size, s->image_width * s->image_height * 3);
235 return -1;
236 }
237
238 res = encode_bitstream(s, p, buf, buf_size, opt_w * 16, opt_h * 16,
239 pfptr, &I_frame);
240
241 //save the current frame
242 if (p->linesize[0] > 0)
243 memcpy(s->previous_frame, p->data[0], s->image_height * p->linesize[0]);
244 else
245 memcpy(s->previous_frame,
246 p->data[0] + p->linesize[0] * (s->image_height - 1),
247 s->image_height * FFABS(p->linesize[0]));
248
249 //mark the frame type so the muxer can mux it correctly
250 if (I_frame) {
251 p->pict_type = AV_PICTURE_TYPE_I;
252 p->key_frame = 1;
253 s->last_key_frame = avctx->frame_number;
254 av_dlog(avctx, "Inserting keyframe at frame %d\n", avctx->frame_number);
255 } else {
256 p->pict_type = AV_PICTURE_TYPE_P;
257 p->key_frame = 0;
258 }
259
260 avctx->coded_frame = p;
261
262 return res;
263 }
264
265 static av_cold int flashsv_encode_end(AVCodecContext *avctx)
266 {
267 FlashSVContext *s = avctx->priv_data;
268
269 deflateEnd(&s->zstream);
270
271 av_free(s->encbuffer);
272 av_free(s->previous_frame);
273 av_free(s->tmpblock);
274
275 return 0;
276 }
277
278 AVCodec ff_flashsv_encoder = {
279 .name = "flashsv",
280 .type = AVMEDIA_TYPE_VIDEO,
281 .id = CODEC_ID_FLASHSV,
282 .priv_data_size = sizeof(FlashSVContext),
283 .init = flashsv_encode_init,
284 .encode = flashsv_encode_frame,
285 .close = flashsv_encode_end,
286 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_NONE},
287 .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video"),
288 };
289