2 * Mpeg video formats-related picture management functions
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/avassert.h"
24 #include "libavutil/common.h"
27 #include "motion_est.h"
28 #include "mpegpicture.h"
29 #include "mpegutils.h"
31 static int make_tables_writable(Picture *pic)
34 #define MAKE_WRITABLE(table) \
37 (ret = av_buffer_make_writable(&pic->table)) < 0)\
41 MAKE_WRITABLE(mb_var_buf);
42 MAKE_WRITABLE(mc_mb_var_buf);
43 MAKE_WRITABLE(mb_mean_buf);
44 MAKE_WRITABLE(mbskip_table_buf);
45 MAKE_WRITABLE(qscale_table_buf);
46 MAKE_WRITABLE(mb_type_buf);
48 for (i = 0; i < 2; i++) {
49 MAKE_WRITABLE(motion_val_buf[i]);
50 MAKE_WRITABLE(ref_index_buf[i]);
56 int ff_mpeg_framesize_alloc(AVCodecContext *avctx, MotionEstContext *me,
57 ScratchpadContext *sc, int linesize)
59 int alloc_size = FFALIGN(FFABS(linesize) + 64, 32);
61 if (avctx->hwaccel || avctx->codec->capabilities & AV_CODEC_CAP_HWACCEL_VDPAU)
65 av_log(avctx, AV_LOG_ERROR, "Image too small, temporary buffers cannot function\n");
66 return AVERROR_PATCHWELCOME;
69 // edge emu needs blocksize + filter length - 1
70 // (= 17x17 for halfpel / 21x21 for h264)
71 // VC1 computes luma and chroma simultaneously and needs 19X19 + 9x9
72 // at uvlinesize. It supports only YUV420 so 24x24 is enough
73 // linesize * interlaced * MBsize
74 // we also use this buffer for encoding in encode_mb_internal() needig an additional 32 lines
75 FF_ALLOCZ_ARRAY_OR_GOTO(avctx, sc->edge_emu_buffer, alloc_size, 4 * 68,
78 FF_ALLOCZ_ARRAY_OR_GOTO(avctx, me->scratchpad, alloc_size, 4 * 16 * 2,
80 me->temp = me->scratchpad;
81 sc->rd_scratchpad = me->scratchpad;
82 sc->b_scratchpad = me->scratchpad;
83 sc->obmc_scratchpad = me->scratchpad + 16;
87 av_freep(&sc->edge_emu_buffer);
88 return AVERROR(ENOMEM);
92 * Allocate a frame buffer
94 static int alloc_frame_buffer(AVCodecContext *avctx, Picture *pic,
95 MotionEstContext *me, ScratchpadContext *sc,
96 int chroma_x_shift, int chroma_y_shift,
97 int linesize, int uvlinesize)
99 int edges_needed = av_codec_is_encoder(avctx->codec);
103 if (avctx->codec_id != AV_CODEC_ID_WMV3IMAGE &&
104 avctx->codec_id != AV_CODEC_ID_VC1IMAGE &&
105 avctx->codec_id != AV_CODEC_ID_MSS2) {
107 pic->f->width = avctx->width + 2 * EDGE_WIDTH;
108 pic->f->height = avctx->height + 2 * EDGE_WIDTH;
111 r = ff_thread_get_buffer(avctx, &pic->tf,
112 pic->reference ? AV_GET_BUFFER_FLAG_REF : 0);
114 pic->f->width = avctx->width;
115 pic->f->height = avctx->height;
116 pic->f->format = avctx->pix_fmt;
117 r = avcodec_default_get_buffer2(avctx, pic->f, 0);
120 if (r < 0 || !pic->f->buf[0]) {
121 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed (%d %p)\n",
128 for (i = 0; pic->f->data[i]; i++) {
129 int offset = (EDGE_WIDTH >> (i ? chroma_y_shift : 0)) *
130 pic->f->linesize[i] +
131 (EDGE_WIDTH >> (i ? chroma_x_shift : 0));
132 pic->f->data[i] += offset;
134 pic->f->width = avctx->width;
135 pic->f->height = avctx->height;
138 if (avctx->hwaccel) {
139 assert(!pic->hwaccel_picture_private);
140 if (avctx->hwaccel->frame_priv_data_size) {
141 pic->hwaccel_priv_buf = av_buffer_allocz(avctx->hwaccel->frame_priv_data_size);
142 if (!pic->hwaccel_priv_buf) {
143 av_log(avctx, AV_LOG_ERROR, "alloc_frame_buffer() failed (hwaccel private data allocation)\n");
146 pic->hwaccel_picture_private = pic->hwaccel_priv_buf->data;
150 if (linesize && (linesize != pic->f->linesize[0] ||
151 uvlinesize != pic->f->linesize[1])) {
152 av_log(avctx, AV_LOG_ERROR,
153 "get_buffer() failed (stride changed)\n");
154 ff_mpeg_unref_picture(avctx, pic);
158 if (pic->f->linesize[1] != pic->f->linesize[2]) {
159 av_log(avctx, AV_LOG_ERROR,
160 "get_buffer() failed (uv stride mismatch)\n");
161 ff_mpeg_unref_picture(avctx, pic);
165 if (!sc->edge_emu_buffer &&
166 (ret = ff_mpeg_framesize_alloc(avctx, me, sc,
167 pic->f->linesize[0])) < 0) {
168 av_log(avctx, AV_LOG_ERROR,
169 "get_buffer() failed to allocate context scratch buffers.\n");
170 ff_mpeg_unref_picture(avctx, pic);
177 static int alloc_picture_tables(AVCodecContext *avctx, Picture *pic, int encoding, int out_format,
178 int mb_stride, int mb_width, int mb_height, int b8_stride)
180 const int big_mb_num = mb_stride * (mb_height + 1) + 1;
181 const int mb_array_size = mb_stride * mb_height;
182 const int b8_array_size = b8_stride * mb_height * 2;
186 pic->mbskip_table_buf = av_buffer_allocz(mb_array_size + 2);
187 pic->qscale_table_buf = av_buffer_allocz(big_mb_num + mb_stride);
188 pic->mb_type_buf = av_buffer_allocz((big_mb_num + mb_stride) *
190 if (!pic->mbskip_table_buf || !pic->qscale_table_buf || !pic->mb_type_buf)
191 return AVERROR(ENOMEM);
194 pic->mb_var_buf = av_buffer_allocz(mb_array_size * sizeof(int16_t));
195 pic->mc_mb_var_buf = av_buffer_allocz(mb_array_size * sizeof(int16_t));
196 pic->mb_mean_buf = av_buffer_allocz(mb_array_size);
197 if (!pic->mb_var_buf || !pic->mc_mb_var_buf || !pic->mb_mean_buf)
198 return AVERROR(ENOMEM);
201 if (out_format == FMT_H263 || encoding || avctx->debug_mv ||
202 (avctx->flags2 & AV_CODEC_FLAG2_EXPORT_MVS)) {
203 int mv_size = 2 * (b8_array_size + 4) * sizeof(int16_t);
204 int ref_index_size = 4 * mb_array_size;
206 for (i = 0; mv_size && i < 2; i++) {
207 pic->motion_val_buf[i] = av_buffer_allocz(mv_size);
208 pic->ref_index_buf[i] = av_buffer_allocz(ref_index_size);
209 if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i])
210 return AVERROR(ENOMEM);
214 pic->alloc_mb_width = mb_width;
215 pic->alloc_mb_height = mb_height;
221 * Allocate a Picture.
222 * The pixels are allocated/set by calling get_buffer() if shared = 0
224 int ff_alloc_picture(AVCodecContext *avctx, Picture *pic, MotionEstContext *me,
225 ScratchpadContext *sc, int shared, int encoding,
226 int chroma_x_shift, int chroma_y_shift, int out_format,
227 int mb_stride, int mb_width, int mb_height, int b8_stride,
228 ptrdiff_t *linesize, ptrdiff_t *uvlinesize)
232 if (pic->qscale_table_buf)
233 if ( pic->alloc_mb_width != mb_width
234 || pic->alloc_mb_height != mb_height)
235 ff_free_picture_tables(pic);
238 av_assert0(pic->f->data[0]);
241 av_assert0(!pic->f->buf[0]);
242 if (alloc_frame_buffer(avctx, pic, me, sc,
243 chroma_x_shift, chroma_y_shift,
244 *linesize, *uvlinesize) < 0)
247 *linesize = pic->f->linesize[0];
248 *uvlinesize = pic->f->linesize[1];
251 if (!pic->qscale_table_buf)
252 ret = alloc_picture_tables(avctx, pic, encoding, out_format,
253 mb_stride, mb_width, mb_height, b8_stride);
255 ret = make_tables_writable(pic);
260 pic->mb_var = (uint16_t*)pic->mb_var_buf->data;
261 pic->mc_mb_var = (uint16_t*)pic->mc_mb_var_buf->data;
262 pic->mb_mean = pic->mb_mean_buf->data;
265 pic->mbskip_table = pic->mbskip_table_buf->data;
266 pic->qscale_table = pic->qscale_table_buf->data + 2 * mb_stride + 1;
267 pic->mb_type = (uint32_t*)pic->mb_type_buf->data + 2 * mb_stride + 1;
269 if (pic->motion_val_buf[0]) {
270 for (i = 0; i < 2; i++) {
271 pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;
272 pic->ref_index[i] = pic->ref_index_buf[i]->data;
278 av_log(avctx, AV_LOG_ERROR, "Error allocating a picture.\n");
279 ff_mpeg_unref_picture(avctx, pic);
280 ff_free_picture_tables(pic);
281 return AVERROR(ENOMEM);
285 * Deallocate a picture.
287 void ff_mpeg_unref_picture(AVCodecContext *avctx, Picture *pic)
289 int off = offsetof(Picture, mb_mean) + sizeof(pic->mb_mean);
292 /* WM Image / Screen codecs allocate internal buffers with different
293 * dimensions / colorspaces; ignore user-defined callbacks for these. */
294 if (avctx->codec_id != AV_CODEC_ID_WMV3IMAGE &&
295 avctx->codec_id != AV_CODEC_ID_VC1IMAGE &&
296 avctx->codec_id != AV_CODEC_ID_MSS2)
297 ff_thread_release_buffer(avctx, &pic->tf);
299 av_frame_unref(pic->f);
301 av_buffer_unref(&pic->hwaccel_priv_buf);
303 if (pic->needs_realloc)
304 ff_free_picture_tables(pic);
306 memset((uint8_t*)pic + off, 0, sizeof(*pic) - off);
309 int ff_update_picture_tables(Picture *dst, Picture *src)
313 #define UPDATE_TABLE(table) \
316 (!dst->table || dst->table->buffer != src->table->buffer)) { \
317 av_buffer_unref(&dst->table); \
318 dst->table = av_buffer_ref(src->table); \
320 ff_free_picture_tables(dst); \
321 return AVERROR(ENOMEM); \
326 UPDATE_TABLE(mb_var_buf);
327 UPDATE_TABLE(mc_mb_var_buf);
328 UPDATE_TABLE(mb_mean_buf);
329 UPDATE_TABLE(mbskip_table_buf);
330 UPDATE_TABLE(qscale_table_buf);
331 UPDATE_TABLE(mb_type_buf);
332 for (i = 0; i < 2; i++) {
333 UPDATE_TABLE(motion_val_buf[i]);
334 UPDATE_TABLE(ref_index_buf[i]);
337 dst->mb_var = src->mb_var;
338 dst->mc_mb_var = src->mc_mb_var;
339 dst->mb_mean = src->mb_mean;
340 dst->mbskip_table = src->mbskip_table;
341 dst->qscale_table = src->qscale_table;
342 dst->mb_type = src->mb_type;
343 for (i = 0; i < 2; i++) {
344 dst->motion_val[i] = src->motion_val[i];
345 dst->ref_index[i] = src->ref_index[i];
348 dst->alloc_mb_width = src->alloc_mb_width;
349 dst->alloc_mb_height = src->alloc_mb_height;
354 int ff_mpeg_ref_picture(AVCodecContext *avctx, Picture *dst, Picture *src)
358 av_assert0(!dst->f->buf[0]);
359 av_assert0(src->f->buf[0]);
363 ret = ff_thread_ref_frame(&dst->tf, &src->tf);
367 ret = ff_update_picture_tables(dst, src);
371 if (src->hwaccel_picture_private) {
372 dst->hwaccel_priv_buf = av_buffer_ref(src->hwaccel_priv_buf);
373 if (!dst->hwaccel_priv_buf)
375 dst->hwaccel_picture_private = dst->hwaccel_priv_buf->data;
378 dst->field_picture = src->field_picture;
379 dst->mb_var_sum = src->mb_var_sum;
380 dst->mc_mb_var_sum = src->mc_mb_var_sum;
381 dst->b_frame_score = src->b_frame_score;
382 dst->needs_realloc = src->needs_realloc;
383 dst->reference = src->reference;
384 dst->shared = src->shared;
388 ff_mpeg_unref_picture(avctx, dst);
392 static inline int pic_is_unused(Picture *pic)
396 if (pic->needs_realloc && !(pic->reference & DELAYED_PIC_REF))
401 static int find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
406 for (i = 0; i < MAX_PICTURE_COUNT; i++) {
407 if (!picture[i].f->buf[0])
411 for (i = 0; i < MAX_PICTURE_COUNT; i++) {
412 if (pic_is_unused(&picture[i]))
417 av_log(avctx, AV_LOG_FATAL,
418 "Internal error, picture buffer overflow\n");
419 /* We could return -1, but the codec would crash trying to draw into a
420 * non-existing frame anyway. This is safer than waiting for a random crash.
421 * Also the return of this is never useful, an encoder must only allocate
422 * as much as allowed in the specification. This has no relationship to how
423 * much libavcodec could allocate (and MAX_PICTURE_COUNT is always large
424 * enough for such valid streams).
425 * Plus, a decoder has to check stream validity and remove frames if too
426 * many reference frames are around. Waiting for "OOM" is not correct at
427 * all. Similarly, missing reference frames have to be replaced by
428 * interpolated/MC frames, anything else is a bug in the codec ...
434 int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
436 int ret = find_unused_picture(avctx, picture, shared);
438 if (ret >= 0 && ret < MAX_PICTURE_COUNT) {
439 if (picture[ret].needs_realloc) {
440 picture[ret].needs_realloc = 0;
441 ff_free_picture_tables(&picture[ret]);
442 ff_mpeg_unref_picture(avctx, &picture[ret]);
448 void ff_free_picture_tables(Picture *pic)
452 pic->alloc_mb_width =
453 pic->alloc_mb_height = 0;
455 av_buffer_unref(&pic->mb_var_buf);
456 av_buffer_unref(&pic->mc_mb_var_buf);
457 av_buffer_unref(&pic->mb_mean_buf);
458 av_buffer_unref(&pic->mbskip_table_buf);
459 av_buffer_unref(&pic->qscale_table_buf);
460 av_buffer_unref(&pic->mb_type_buf);
462 for (i = 0; i < 2; i++) {
463 av_buffer_unref(&pic->motion_val_buf[i]);
464 av_buffer_unref(&pic->ref_index_buf[i]);