lavfi: add error handling to start_frame().
[libav.git] / libavfilter / video.c
1 /*
2 * This file is part of Libav.
3 *
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "libavutil/imgutils.h"
20
21 #include "avfilter.h"
22 #include "internal.h"
23 #include "video.h"
24
25 #ifdef DEBUG
26 static char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
27 {
28 snprintf(buf, buf_size, "%s%s%s%s%s%s",
29 perms & AV_PERM_READ ? "r" : "",
30 perms & AV_PERM_WRITE ? "w" : "",
31 perms & AV_PERM_PRESERVE ? "p" : "",
32 perms & AV_PERM_REUSE ? "u" : "",
33 perms & AV_PERM_REUSE2 ? "U" : "",
34 perms & AV_PERM_NEG_LINESIZES ? "n" : "");
35 return buf;
36 }
37 #endif
38
39 static void ff_dlog_ref(void *ctx, AVFilterBufferRef *ref, int end)
40 {
41 av_unused char buf[16];
42 av_dlog(ctx,
43 "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
44 ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
45 ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
46 ref->pts, ref->pos);
47
48 if (ref->video) {
49 av_dlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
50 ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
51 ref->video->w, ref->video->h,
52 !ref->video->interlaced ? 'P' : /* Progressive */
53 ref->video->top_field_first ? 'T' : 'B', /* Top / Bottom */
54 ref->video->key_frame,
55 av_get_picture_type_char(ref->video->pict_type));
56 }
57 if (ref->audio) {
58 av_dlog(ctx, " cl:%"PRId64"d n:%d r:%d p:%d",
59 ref->audio->channel_layout,
60 ref->audio->nb_samples,
61 ref->audio->sample_rate,
62 ref->audio->planar);
63 }
64
65 av_dlog(ctx, "]%s", end ? "\n" : "");
66 }
67
68 AVFilterBufferRef *ff_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
69 {
70 return ff_get_video_buffer(link->dst->outputs[0], perms, w, h);
71 }
72
73 /* TODO: set the buffer's priv member to a context structure for the whole
74 * filter chain. This will allow for a buffer pool instead of the constant
75 * alloc & free cycle currently implemented. */
76 AVFilterBufferRef *ff_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
77 {
78 int linesize[4];
79 uint8_t *data[4];
80 AVFilterBufferRef *picref = NULL;
81
82 // +2 is needed for swscaler, +16 to be SIMD-friendly
83 if (av_image_alloc(data, linesize, w, h, link->format, 16) < 0)
84 return NULL;
85
86 picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,
87 perms, w, h, link->format);
88 if (!picref) {
89 av_free(data[0]);
90 return NULL;
91 }
92
93 return picref;
94 }
95
96 AVFilterBufferRef *
97 avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int perms,
98 int w, int h, enum PixelFormat format)
99 {
100 AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
101 AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
102
103 if (!pic || !picref)
104 goto fail;
105
106 picref->buf = pic;
107 picref->buf->free = ff_avfilter_default_free_buffer;
108 if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
109 goto fail;
110
111 pic->w = picref->video->w = w;
112 pic->h = picref->video->h = h;
113
114 /* make sure the buffer gets read permission or it's useless for output */
115 picref->perms = perms | AV_PERM_READ;
116
117 pic->refcount = 1;
118 picref->type = AVMEDIA_TYPE_VIDEO;
119 pic->format = picref->format = format;
120
121 memcpy(pic->data, data, 4*sizeof(data[0]));
122 memcpy(pic->linesize, linesize, 4*sizeof(linesize[0]));
123 memcpy(picref->data, pic->data, sizeof(picref->data));
124 memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
125
126 pic-> extended_data = pic->data;
127 picref->extended_data = picref->data;
128
129 picref->pts = AV_NOPTS_VALUE;
130
131 return picref;
132
133 fail:
134 if (picref && picref->video)
135 av_free(picref->video);
136 av_free(picref);
137 av_free(pic);
138 return NULL;
139 }
140
141 AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
142 {
143 AVFilterBufferRef *ret = NULL;
144
145 av_unused char buf[16];
146 FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0);
147 av_dlog(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
148
149 if (link->dstpad->get_video_buffer)
150 ret = link->dstpad->get_video_buffer(link, perms, w, h);
151
152 if (!ret)
153 ret = ff_default_get_video_buffer(link, perms, w, h);
154
155 if (ret)
156 ret->type = AVMEDIA_TYPE_VIDEO;
157
158 FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " returning "); ff_dlog_ref(NULL, ret, 1);
159
160 return ret;
161 }
162
163 int ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
164 {
165 AVFilterBufferRef *buf_out = avfilter_ref_buffer(picref, ~0);
166 if (!buf_out)
167 return AVERROR(ENOMEM);
168 return ff_start_frame(link->dst->outputs[0], buf_out);
169 }
170
171 static int default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
172 {
173 AVFilterLink *outlink = NULL;
174
175 if (inlink->dst->nb_outputs)
176 outlink = inlink->dst->outputs[0];
177
178 if (outlink) {
179 outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
180 if (!outlink->out_buf)
181 return AVERROR(ENOMEM);
182
183 avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
184 return ff_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
185 }
186 return 0;
187 }
188
189 static void clear_link(AVFilterLink *link)
190 {
191 avfilter_unref_bufferp(&link->cur_buf);
192 avfilter_unref_bufferp(&link->src_buf);
193 avfilter_unref_bufferp(&link->out_buf);
194 }
195
196 /* XXX: should we do the duplicating of the picture ref here, instead of
197 * forcing the source filter to do it? */
198 int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
199 {
200 int (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
201 AVFilterPad *dst = link->dstpad;
202 int ret, perms = picref->perms;
203
204 FF_DPRINTF_START(NULL, start_frame); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " "); ff_dlog_ref(NULL, picref, 1);
205
206 if (!(start_frame = dst->start_frame))
207 start_frame = default_start_frame;
208
209 if (picref->linesize[0] < 0)
210 perms |= AV_PERM_NEG_LINESIZES;
211 /* prepare to copy the picture if it has insufficient permissions */
212 if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
213 av_log(link->dst, AV_LOG_DEBUG,
214 "frame copy needed (have perms %x, need %x, reject %x)\n",
215 picref->perms,
216 link->dstpad->min_perms, link->dstpad->rej_perms);
217
218 link->cur_buf = ff_get_video_buffer(link, dst->min_perms, link->w, link->h);
219 if (!link->cur_buf) {
220 avfilter_unref_bufferp(&picref);
221 return AVERROR(ENOMEM);
222 }
223
224 link->src_buf = picref;
225 avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
226 }
227 else
228 link->cur_buf = picref;
229
230 ret = start_frame(link, link->cur_buf);
231 if (ret < 0)
232 clear_link(link);
233
234 return ret;
235 }
236
237 void ff_null_end_frame(AVFilterLink *link)
238 {
239 ff_end_frame(link->dst->outputs[0]);
240 }
241
242 static void default_end_frame(AVFilterLink *inlink)
243 {
244 AVFilterLink *outlink = NULL;
245
246 if (inlink->dst->nb_outputs)
247 outlink = inlink->dst->outputs[0];
248
249 if (outlink) {
250 ff_end_frame(outlink);
251 }
252 }
253
254 void ff_end_frame(AVFilterLink *link)
255 {
256 void (*end_frame)(AVFilterLink *);
257
258 if (!(end_frame = link->dstpad->end_frame))
259 end_frame = default_end_frame;
260
261 end_frame(link);
262
263 clear_link(link);
264 }
265
266 void ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
267 {
268 ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
269 }
270
271 static void default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
272 {
273 AVFilterLink *outlink = NULL;
274
275 if (inlink->dst->nb_outputs)
276 outlink = inlink->dst->outputs[0];
277
278 if (outlink)
279 ff_draw_slice(outlink, y, h, slice_dir);
280 }
281
282 void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
283 {
284 uint8_t *src[4], *dst[4];
285 int i, j, vsub;
286 void (*draw_slice)(AVFilterLink *, int, int, int);
287
288 FF_DPRINTF_START(NULL, draw_slice); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
289
290 /* copy the slice if needed for permission reasons */
291 if (link->src_buf) {
292 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
293
294 for (i = 0; i < 4; i++) {
295 if (link->src_buf->data[i]) {
296 src[i] = link->src_buf-> data[i] +
297 (y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
298 dst[i] = link->cur_buf->data[i] +
299 (y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
300 } else
301 src[i] = dst[i] = NULL;
302 }
303
304 for (i = 0; i < 4; i++) {
305 int planew =
306 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
307
308 if (!src[i]) continue;
309
310 for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
311 memcpy(dst[i], src[i], planew);
312 src[i] += link->src_buf->linesize[i];
313 dst[i] += link->cur_buf->linesize[i];
314 }
315 }
316 }
317
318 if (!(draw_slice = link->dstpad->draw_slice))
319 draw_slice = default_draw_slice;
320 draw_slice(link, y, h, slice_dir);
321 }