FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mpegvideo.c
Date: 2025-07-28 20:30:09
Exec Total Coverage
Lines: 254 290 87.6%
Functions: 16 18 88.9%
Branches: 114 148 77.0%
Line Branch Exec Source
1 /*
2 * The simplest mpeg encoder (well, it was the simplest!)
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * 4MV & hq & B-frame encoding stuff by Michael Niedermayer <michaelni@gmx.at>
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 /**
26 * @file
27 * The simplest mpeg encoder (well, it was the simplest!).
28 */
29
30 #include "libavutil/attributes.h"
31 #include "libavutil/avassert.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/intreadwrite.h"
35 #include "libavutil/mem.h"
36
37 #include "avcodec.h"
38 #include "blockdsp.h"
39 #include "idctdsp.h"
40 #include "mathops.h"
41 #include "mpeg_er.h"
42 #include "mpegutils.h"
43 #include "mpegvideo.h"
44 #include "mpegvideodata.h"
45 #include "mpegvideo_unquantize.h"
46 #include "libavutil/refstruct.h"
47
48
49 ✗ static void gray16(uint8_t *dst, const uint8_t *src, ptrdiff_t linesize, int h)
50 {
51 ✗ while(h--)
52 ✗ memset(dst + h*linesize, 128, 16);
53 ✗ }
54
55 ✗ static void gray8(uint8_t *dst, const uint8_t *src, ptrdiff_t linesize, int h)
56 {
57 ✗ while(h--)
58 ✗ memset(dst + h*linesize, 128, 8);
59 ✗ }
60
61 /* init common dct for both encoder and decoder */
62 800 static av_cold void dsp_init(MpegEncContext *s)
63 {
64 800 ff_blockdsp_init(&s->bdsp);
65 800 ff_hpeldsp_init(&s->hdsp, s->avctx->flags);
66 800 ff_videodsp_init(&s->vdsp, s->avctx->bits_per_raw_sample);
67
68
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 800 if (s->avctx->debug & FF_DEBUG_NOMC) {
69 int i;
70 ✗ for (i=0; i<4; i++) {
71 ✗ s->hdsp.avg_pixels_tab[0][i] = gray16;
72 ✗ s->hdsp.put_pixels_tab[0][i] = gray16;
73 ✗ s->hdsp.put_no_rnd_pixels_tab[0][i] = gray16;
74
75 ✗ s->hdsp.avg_pixels_tab[1][i] = gray8;
76 ✗ s->hdsp.put_pixels_tab[1][i] = gray8;
77 ✗ s->hdsp.put_no_rnd_pixels_tab[1][i] = gray8;
78 }
79 }
80 800 }
81
82 5452 av_cold void ff_init_scantable(const uint8_t *permutation, ScanTable *st,
83 const uint8_t *src_scantable)
84 {
85 5452 st->scantable = src_scantable;
86
87
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 354380 for (int i = 0, end = -1; i < 64; i++) {
88 348928 int j = src_scantable[i];
89 348928 st->permutated[i] = permutation[j];
90
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 348928 if (permutation[j] > end)
91 102778 end = permutation[j];
92 348928 st->raster_end[i] = end;
93 }
94 5452 }
95
96 916 av_cold void ff_mpv_idct_init(MpegEncContext *s)
97 {
98
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 916 if (s->codec_id == AV_CODEC_ID_MPEG4)
99 253 s->idsp.mpeg4_studio_profile = s->studio_profile;
100 916 ff_idctdsp_init(&s->idsp, s->avctx);
101
102 /* load & permutate scantables
103 * note: only wmv uses different ones
104 */
105
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 916 if (s->alternate_scan) {
106 4 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
107 4 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
108 } else {
109 912 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
110 912 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
111 }
112 916 ff_permute_scantable(s->permutated_intra_h_scantable, ff_alternate_horizontal_scan,
113 916 s->idsp.idct_permutation);
114 916 ff_permute_scantable(s->permutated_intra_v_scantable, ff_alternate_vertical_scan,
115 916 s->idsp.idct_permutation);
116 916 }
117
118 847 av_cold int ff_mpv_init_duplicate_contexts(MpegEncContext *s)
119 {
120 847 const int nb_slices = s->slice_context_count;
121 847 const size_t slice_size = s->slice_ctx_size;
122
123
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 921 for (int i = 1; i < nb_slices; i++) {
124 74 s->thread_context[i] = av_memdup(s, slice_size);
125
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 74 if (!s->thread_context[i])
126 ✗ return AVERROR(ENOMEM);
127 74 s->thread_context[i]->start_mb_y =
128 74 (s->mb_height * (i ) + nb_slices / 2) / nb_slices;
129 74 s->thread_context[i]->end_mb_y =
130 74 (s->mb_height * (i + 1) + nb_slices / 2) / nb_slices;
131 }
132 847 s->start_mb_y = 0;
133 869 s->end_mb_y = nb_slices > 1 ? (s->mb_height + nb_slices / 2) / nb_slices
134
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 847 : s->mb_height;
135 847 return 0;
136 }
137
138 993 static av_cold void free_duplicate_context(MpegEncContext *s)
139 {
140
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 993 if (!s)
141 ✗ return;
142
143 993 av_freep(&s->sc.edge_emu_buffer);
144 993 av_freep(&s->sc.scratchpad_buf);
145 993 s->sc.obmc_scratchpad = NULL;
146 993 s->sc.linesize = 0;
147 }
148
149 919 static av_cold void free_duplicate_contexts(MpegEncContext *s)
150 {
151
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 993 for (int i = 1; i < s->slice_context_count; i++) {
152 74 free_duplicate_context(s->thread_context[i]);
153 74 av_freep(&s->thread_context[i]);
154 }
155 919 free_duplicate_context(s);
156 919 }
157
158 8316 int ff_update_duplicate_context(MpegEncContext *dst, const MpegEncContext *src)
159 {
160 #define COPY(M) \
161 M(ScratchpadContext, sc) \
162 M(int, start_mb_y) \
163 M(int, end_mb_y) \
164 M(int16_t*, dc_val) \
165 M(void*, ac_val)
166
167 int ret;
168 // FIXME copy only needed parts
169 #define BACKUP(T, member) T member = dst->member;
170 8316 COPY(BACKUP)
171 8316 memcpy(dst, src, sizeof(MpegEncContext));
172 #define RESTORE(T, member) dst->member = member;
173 8316 COPY(RESTORE)
174
175 8316 ret = ff_mpv_framesize_alloc(dst->avctx, &dst->sc, dst->linesize);
176
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 8316 if (ret < 0) {
177 ✗ av_log(dst->avctx, AV_LOG_ERROR, "failed to allocate context "
178 "scratch buffers.\n");
179 ✗ return ret;
180 }
181 8316 return 0;
182 }
183
184 /**
185 * Set the given MpegEncContext to common defaults
186 * (same for encoding and decoding).
187 * The changed fields will not depend upon the
188 * prior state of the MpegEncContext.
189 */
190 838 av_cold void ff_mpv_common_defaults(MpegEncContext *s)
191 {
192 838 s->chroma_qscale_table = ff_default_chroma_qscale_table;
193 838 s->progressive_frame = 1;
194 838 s->progressive_sequence = 1;
195 838 s->picture_structure = PICT_FRAME;
196
197 838 s->slice_context_count = 1;
198 838 }
199
200 919 static av_cold void free_buffer_pools(BufferPoolContext *pools)
201 {
202 919 av_refstruct_pool_uninit(&pools->mbskip_table_pool);
203 919 av_refstruct_pool_uninit(&pools->qscale_table_pool);
204 919 av_refstruct_pool_uninit(&pools->mb_type_pool);
205 919 av_refstruct_pool_uninit(&pools->motion_val_pool);
206 919 av_refstruct_pool_uninit(&pools->ref_index_pool);
207 919 pools->alloc_mb_height = pools->alloc_mb_width = pools->alloc_mb_stride = 0;
208 919 }
209
210 847 av_cold int ff_mpv_init_context_frame(MpegEncContext *s)
211 {
212 847 int nb_slices = (HAVE_THREADS &&
213 847 s->avctx->active_thread_type & FF_THREAD_SLICE) ?
214
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 847 s->avctx->thread_count : 1;
215 847 BufferPoolContext *const pools = &s->buffer_pools;
216 int y_size, c_size, yc_size, mb_array_size, mv_table_size, x, y;
217 int mb_height;
218
219
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 847 if (s->encoding && s->avctx->slices)
220 12 nb_slices = s->avctx->slices;
221
222
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 847 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && !s->progressive_sequence)
223 159 s->mb_height = (s->height + 31) / 32 * 2;
224 else
225 688 s->mb_height = (s->height + 15) / 16;
226
227
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 847 if (nb_slices > MAX_THREADS || (nb_slices > s->mb_height && s->mb_height)) {
228 int max_slices;
229
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 1 if (s->mb_height)
230 1 max_slices = FFMIN(MAX_THREADS, s->mb_height);
231 else
232 ✗ max_slices = MAX_THREADS;
233 1 av_log(s->avctx, AV_LOG_WARNING, "too many threads/slices (%d),"
234 " reducing to %d\n", nb_slices, max_slices);
235 1 nb_slices = max_slices;
236 }
237
238 847 s->slice_context_count = nb_slices;
239
240 /* VC-1 can change from being progressive to interlaced on a per-frame
241 * basis. We therefore allocate certain buffers so big that they work
242 * in both instances. */
243 1694 mb_height = s->msmpeg4_version == MSMP4_VC1 ?
244
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 847 FFALIGN(s->mb_height, 2) : s->mb_height;
245
246 847 s->mb_width = (s->width + 15) / 16;
247 847 s->mb_stride = s->mb_width + 1;
248 847 s->b8_stride = s->mb_width * 2 + 1;
249 847 mb_array_size = mb_height * s->mb_stride;
250 847 mv_table_size = (mb_height + 2) * s->mb_stride + 1;
251
252 /* set default edge pos, will be overridden
253 * in decode_header if needed */
254 847 s->h_edge_pos = s->mb_width * 16;
255 847 s->v_edge_pos = s->mb_height * 16;
256
257 847 s->mb_num = s->mb_width * s->mb_height;
258
259 847 s->block_wrap[0] =
260 847 s->block_wrap[1] =
261 847 s->block_wrap[2] =
262 847 s->block_wrap[3] = s->b8_stride;
263 847 s->block_wrap[4] =
264 847 s->block_wrap[5] = s->mb_stride;
265
266 847 y_size = s->b8_stride * (2 * mb_height + 1);
267 847 c_size = s->mb_stride * (mb_height + 1);
268 847 yc_size = y_size + 2 * c_size;
269
270
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 847 if (!FF_ALLOCZ_TYPED_ARRAY(s->mb_index2xy, s->mb_num + 1))
271 ✗ return AVERROR(ENOMEM);
272
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 17890 for (y = 0; y < s->mb_height; y++)
273
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 569646 for (x = 0; x < s->mb_width; x++)
274 552603 s->mb_index2xy[x + y * s->mb_width] = x + y * s->mb_stride;
275
276 847 s->mb_index2xy[s->mb_height * s->mb_width] = (s->mb_height - 1) * s->mb_stride + s->mb_width; // FIXME really needed?
277
278 #define ALLOC_POOL(name, size, flags) do { \
279 pools->name ##_pool = av_refstruct_pool_alloc((size), (flags)); \
280 if (!pools->name ##_pool) \
281 return AVERROR(ENOMEM); \
282 } while (0)
283
284
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 847 if (s->codec_id == AV_CODEC_ID_MPEG4 ||
285
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 568 (s->avctx->flags & AV_CODEC_FLAG_INTERLACED_ME)) {
286 /* interlaced direct mode decoding tables */
287 295 int16_t (*tmp)[2] = av_calloc(mv_table_size, 4 * sizeof(*tmp));
288
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 295 if (!tmp)
289 ✗ return AVERROR(ENOMEM);
290 295 s->p_field_mv_table_base = tmp;
291 295 tmp += s->mb_stride + 1;
292
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 885 for (int i = 0; i < 2; i++) {
293
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 1770 for (int j = 0; j < 2; j++) {
294 1180 s->p_field_mv_table[i][j] = tmp;
295 1180 tmp += mv_table_size;
296 }
297 }
298
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 295 if (s->codec_id == AV_CODEC_ID_MPEG4) {
299
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 279 ALLOC_POOL(mbskip_table, mb_array_size + 2,
300 !s->encoding ? AV_REFSTRUCT_POOL_FLAG_ZERO_EVERY_TIME : 0);
301
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 279 if (!s->encoding) {
302 /* cbp, pred_dir */
303
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 216 if (!(s->cbp_table = av_mallocz(mb_array_size)) ||
304
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 216 !(s->pred_dir_table = av_mallocz(mb_array_size)))
305 ✗ return AVERROR(ENOMEM);
306 }
307 }
308 }
309
310
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 847 if (s->msmpeg4_version >= MSMP4_V3) {
311 81 s->coded_block_base = av_mallocz(y_size);
312
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 81 if (!s->coded_block_base)
313 ✗ return AVERROR(ENOMEM);
314 81 s->coded_block = s->coded_block_base + s->b8_stride + 1;
315 }
316
317
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 847 if (s->h263_pred || s->h263_aic || !s->encoding) {
318 // When encoding, each slice (and therefore each thread)
319 // gets its own ac_val and dc_val buffers in order to avoid
320 // races.
321
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 729 size_t allslice_yc_size = yc_size * (s->encoding ? nb_slices : 1);
322
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 729 if (s->out_format == FMT_H263) {
323 /* ac values */
324
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 462 if (!FF_ALLOCZ_TYPED_ARRAY(s->ac_val_base, allslice_yc_size))
325 ✗ return AVERROR(ENOMEM);
326 462 s->ac_val = s->ac_val_base + s->b8_stride + 1;
327 }
328
329 /* dc values */
330 // MN: we need these for error resilience of intra-frames
331 // Allocating them unconditionally for decoders also means
332 // that we don't need to reinitialize when e.g. h263_aic changes.
333
334 // y_size and therefore yc_size is always odd; allocate one element
335 // more for each encoder slice in order to be able to align each slice's
336 // dc_val to four in order to use aligned stores when cleaning dc_val.
337 729 allslice_yc_size += s->encoding * nb_slices;
338
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 729 if (!FF_ALLOC_TYPED_ARRAY(s->dc_val_base, allslice_yc_size))
339 ✗ return AVERROR(ENOMEM);
340 729 s->dc_val = s->dc_val_base + s->b8_stride + 1;
341
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 3176706 for (size_t i = 0; i < allslice_yc_size; ++i)
342 3175977 s->dc_val_base[i] = 1024;
343 }
344
345 // Note the + 1 is for a quicker MPEG-4 slice_end detection
346
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 847 if (!(s->mbskip_table = av_mallocz(mb_array_size + 2)) ||
347 /* which mb is an intra block, init macroblock skip table */
348
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 847 !(s->mbintra_table = av_mallocz(mb_array_size)))
349 ✗ return AVERROR(ENOMEM);
350
351
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 847 ALLOC_POOL(qscale_table, mv_table_size, 0);
352
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 847 ALLOC_POOL(mb_type, mv_table_size * sizeof(uint32_t), 0);
353
354
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 847 if (s->out_format == FMT_H263 || s->encoding ||
355
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 267 (s->avctx->export_side_data & AV_CODEC_EXPORT_DATA_MVS)) {
356 580 const int b8_array_size = s->b8_stride * mb_height * 2;
357 580 int mv_size = 2 * (b8_array_size + 4) * sizeof(int16_t);
358 580 int ref_index_size = 4 * mb_array_size;
359
360 /* FIXME: The output of H.263 with OBMC depends upon
361 * the earlier content of the buffer; therefore we set
362 * the flags to always reset returned buffers here. */
363
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 580 ALLOC_POOL(motion_val, mv_size, AV_REFSTRUCT_POOL_FLAG_ZERO_EVERY_TIME);
364
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 580 ALLOC_POOL(ref_index, ref_index_size, 0);
365 }
366 #undef ALLOC_POOL
367 847 pools->alloc_mb_width = s->mb_width;
368 847 pools->alloc_mb_height = mb_height;
369 847 pools->alloc_mb_stride = s->mb_stride;
370
371
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 847 return !CONFIG_MPEGVIDEODEC || s->encoding ? 0 : ff_mpeg_er_init(s);
372 }
373
374 /**
375 * init common structure for both encoder and decoder.
376 * this assumes that some variables like width/height are already set
377 */
378 800 av_cold int ff_mpv_common_init(MpegEncContext *s)
379 {
380 int ret;
381
382
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 800 if (s->avctx->pix_fmt == AV_PIX_FMT_NONE) {
383 ✗ av_log(s->avctx, AV_LOG_ERROR,
384 "decoding to AV_PIX_FMT_NONE is not supported.\n");
385 ✗ return AVERROR(EINVAL);
386 }
387
388
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 1588 if ((s->width || s->height) &&
389 788 av_image_check_size(s->width, s->height, 0, s->avctx))
390 ✗ return AVERROR(EINVAL);
391
392 800 dsp_init(s);
393
394 /* set chroma shifts */
395 800 ret = av_pix_fmt_get_chroma_sub_sample(s->avctx->pix_fmt,
396 &s->chroma_x_shift,
397 &s->chroma_y_shift);
398
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 800 if (ret)
399 ✗ return ret;
400
401
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 800 if ((ret = ff_mpv_init_context_frame(s)))
402 ✗ goto fail;
403
404 800 s->context_initialized = 1;
405 800 s->thread_context[0] = s;
406
407 // if (s->width && s->height) {
408
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 800 if (!s->encoding) {
409 596 ret = ff_mpv_init_duplicate_contexts(s);
410
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 596 if (ret < 0)
411 ✗ goto fail;
412 }
413 // }
414
415 800 return 0;
416 ✗ fail:
417 ✗ ff_mpv_common_end(s);
418 ✗ return ret;
419 }
420
421 919 av_cold void ff_mpv_free_context_frame(MpegEncContext *s)
422 {
423 919 free_duplicate_contexts(s);
424
425 919 free_buffer_pools(&s->buffer_pools);
426 919 av_freep(&s->p_field_mv_table_base);
427
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428
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 5514 for (int j = 0; j < 2; j++)
429 3676 s->p_field_mv_table[i][j] = NULL;
430
431 919 av_freep(&s->ac_val_base);
432 919 av_freep(&s->dc_val_base);
433 919 av_freep(&s->coded_block_base);
434 919 av_freep(&s->mbintra_table);
435 919 av_freep(&s->cbp_table);
436 919 av_freep(&s->pred_dir_table);
437
438 919 av_freep(&s->mbskip_table);
439
440 919 av_freep(&s->er.error_status_table);
441 919 av_freep(&s->er.er_temp_buffer);
442 919 av_freep(&s->mb_index2xy);
443
444 919 s->linesize = s->uvlinesize = 0;
445 919 }
446
447 872 av_cold void ff_mpv_common_end(MpegEncContext *s)
448 {
449 872 ff_mpv_free_context_frame(s);
450
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 872 if (s->slice_context_count > 1)
451 22 s->slice_context_count = 1;
452
453 872 ff_mpv_unref_picture(&s->last_pic);
454 872 ff_mpv_unref_picture(&s->cur_pic);
455 872 ff_mpv_unref_picture(&s->next_pic);
456
457 872 s->context_initialized = 0;
458 872 s->context_reinit = 0;
459 872 s->linesize = s->uvlinesize = 0;
460 872 }
461
462
463 /**
464 * Clean dc, ac for the current non-intra MB.
465 */
466 394875 void ff_clean_intra_table_entries(MpegEncContext *s)
467 {
468 394875 int wrap = s->b8_stride;
469 394875 int xy = s->block_index[0];
470 /* chroma */
471 394875 unsigned uxy = s->block_index[4];
472 394875 unsigned vxy = s->block_index[5];
473 394875 int16_t *dc_val = s->dc_val;
474
475 394875 AV_WN32A(dc_val + xy, 1024 << 16 | 1024);
476 394875 AV_WN32 (dc_val + xy + wrap, 1024 << 16 | 1024);
477 394875 dc_val[uxy] =
478 394875 dc_val[vxy] = 1024;
479 /* ac pred */
480 394875 int16_t (*ac_val)[16] = s->ac_val;
481
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 394875 av_assume(!((uintptr_t)ac_val & 0xF));
482 // Don't reset the upper-left luma block, as it will only ever be
483 // referenced by blocks from the same macroblock.
484 394875 memset(ac_val[xy + 1], 0, sizeof(*ac_val));
485 394875 memset(ac_val[xy + wrap], 0, 2 * sizeof(*ac_val));
486 /* ac pred */
487 394875 memset(ac_val[uxy], 0, sizeof(*ac_val));
488 394875 memset(ac_val[vxy], 0, sizeof(*ac_val));
489 394875 }
490
491 841593 void ff_init_block_index(MpegEncContext *s){ //FIXME maybe rename
492 841593 const int linesize = s->cur_pic.linesize[0]; //not s->linesize as this would be wrong for field pics
493 841593 const int uvlinesize = s->cur_pic.linesize[1];
494
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 841593 const int width_of_mb = (4 + (s->avctx->bits_per_raw_sample > 8)) - s->avctx->lowres;
495 841593 const int height_of_mb = 4 - s->avctx->lowres;
496
497 841593 s->block_index[0]= s->b8_stride*(s->mb_y*2 ) - 2 + s->mb_x*2;
498 841593 s->block_index[1]= s->b8_stride*(s->mb_y*2 ) - 1 + s->mb_x*2;
499 841593 s->block_index[2]= s->b8_stride*(s->mb_y*2 + 1) - 2 + s->mb_x*2;
500 841593 s->block_index[3]= s->b8_stride*(s->mb_y*2 + 1) - 1 + s->mb_x*2;
501 841593 s->block_index[4]= s->mb_stride*(s->mb_y + 1) + s->b8_stride*s->mb_height*2 + s->mb_x - 1;
502 841593 s->block_index[5]= s->mb_stride*(s->mb_y + s->mb_height + 2) + s->b8_stride*s->mb_height*2 + s->mb_x - 1;
503 //block_index is not used by mpeg2, so it is not affected by chroma_format
504
505 841593 s->dest[0] = s->cur_pic.data[0] + (int)((s->mb_x - 1U) << width_of_mb);
506 841593 s->dest[1] = s->cur_pic.data[1] + (int)((s->mb_x - 1U) << (width_of_mb - s->chroma_x_shift));
507 841593 s->dest[2] = s->cur_pic.data[2] + (int)((s->mb_x - 1U) << (width_of_mb - s->chroma_x_shift));
508
509
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 841593 if (s->picture_structure == PICT_FRAME) {
510 801299 s->dest[0] += s->mb_y * linesize << height_of_mb;
511 801299 s->dest[1] += s->mb_y * uvlinesize << (height_of_mb - s->chroma_y_shift);
512 801299 s->dest[2] += s->mb_y * uvlinesize << (height_of_mb - s->chroma_y_shift);
513 } else {
514 40294 s->dest[0] += (s->mb_y>>1) * linesize << height_of_mb;
515 40294 s->dest[1] += (s->mb_y>>1) * uvlinesize << (height_of_mb - s->chroma_y_shift);
516 40294 s->dest[2] += (s->mb_y>>1) * uvlinesize << (height_of_mb - s->chroma_y_shift);
517 av_assert1((s->mb_y&1) == (s->picture_structure == PICT_BOTTOM_FIELD));
518 }
519 841593 }
520
521 /**
522 * set qscale and update qscale dependent variables.
523 */
524 1454638 void ff_set_qscale(MpegEncContext * s, int qscale)
525 {
526
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 1454638 if (qscale < 1)
527 1 qscale = 1;
528
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 1454637 else if (qscale > 31)
529 29 qscale = 31;
530
531 1454638 s->qscale = qscale;
532 1454638 s->chroma_qscale= s->chroma_qscale_table[qscale];
533
534 1454638 s->y_dc_scale= s->y_dc_scale_table[ qscale ];
535 1454638 s->c_dc_scale= s->c_dc_scale_table[ s->chroma_qscale ];
536 1454638 }
537