FFmpeg: libswscale/hscale.c Source File

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libswscale

hscale.c

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1 /*

3 *

4 * This file is part of FFmpeg.

5 *

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.

10 *

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.

15 *

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

19 */

21 #include "libavutil/mem.h"

22 #include "swscale_internal.h"

24 /// Scaler instance data

25 typedef struct FilterContext

26 {

27 uint16_t *filter;

28 int *filter_pos;

29 int filter_size;

30 int xInc;

31 } FilterContext;

33 /// Color conversion instance data

34 typedef struct ColorContext

35 {

36 uint32_t *pal;

37 } ColorContext;

39 static int lum_h_scale(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)

40 {

41 FilterContext *instance = desc->instance;

42 int srcW = desc->src->width;

43 int dstW = desc->dst->width;

44 int xInc = instance->xInc;

46 int i;

47 for (i = 0; i < sliceH; ++i) {

48 uint8_t ** src = desc->src->plane[0].line;

49 uint8_t ** dst = desc->dst->plane[0].line;

50 int src_pos = sliceY+i - desc->src->plane[0].sliceY;

51 int dst_pos = sliceY+i - desc->dst->plane[0].sliceY;

54 if (c->hyscale_fast) {

55 c->hyscale_fast(c, (int16_t*)dst[dst_pos], dstW, src[src_pos], srcW, xInc);

56 } else {

57 c->hyScale(c, (int16_t*)dst[dst_pos], dstW, (const uint8_t *)src[src_pos], instance->filter,

58 instance->filter_pos, instance->filter_size);

59 }

61 if (c->lumConvertRange)

62 c->lumConvertRange((int16_t*)dst[dst_pos], dstW);

64 desc->dst->plane[0].sliceH += 1;

66 if (desc->alpha) {

67 src = desc->src->plane[3].line;

68 dst = desc->dst->plane[3].line;

70 src_pos = sliceY+i - desc->src->plane[3].sliceY;

71 dst_pos = sliceY+i - desc->dst->plane[3].sliceY;

73 desc->dst->plane[3].sliceH += 1;

75 if (c->hyscale_fast) {

76 c->hyscale_fast(c, (int16_t*)dst[dst_pos], dstW, src[src_pos], srcW, xInc);

77 } else {

78 c->hyScale(c, (int16_t*)dst[dst_pos], dstW, (const uint8_t *)src[src_pos], instance->filter,

79 instance->filter_pos, instance->filter_size);

80 }

81 }

82 }

84 return sliceH;

85 }

87 static int lum_convert(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)

88 {

89 int srcW = desc->src->width;

90 ColorContext * instance = desc->instance;

91 uint32_t * pal = instance->pal;

92 int i;

94 desc->dst->plane[0].sliceY = sliceY;

95 desc->dst->plane[0].sliceH = sliceH;

96 desc->dst->plane[3].sliceY = sliceY;

97 desc->dst->plane[3].sliceH = sliceH;

99 for (i = 0; i < sliceH; ++i) {

100 int sp0 = sliceY+i - desc->src->plane[0].sliceY;

101 int sp1 = ((sliceY+i) >> desc->src->v_chr_sub_sample) - desc->src->plane[1].sliceY;

102 const uint8_t * src[4] = { desc->src->plane[0].line[sp0],

103 desc->src->plane[1].line[sp1],

104 desc->src->plane[2].line[sp1],

105 desc->src->plane[3].line[sp0]};

106 uint8_t * dst = desc->dst->plane[0].line[i];

107

108 if (c->lumToYV12) {

109 c->lumToYV12(dst, src[0], src[1], src[2], srcW, pal, c->input_opaque);

110 } else if (c->readLumPlanar) {

111 c->readLumPlanar(dst, src, srcW, c->input_rgb2yuv_table, c->input_opaque);

112 }

113

114

115 if (desc->alpha) {

116 dst = desc->dst->plane[3].line[i];

117 if (c->alpToYV12) {

118 c->alpToYV12(dst, src[3], src[1], src[2], srcW, pal, c->input_opaque);

119 } else if (c->readAlpPlanar) {

120 c->readAlpPlanar(dst, src, srcW, NULL, c->input_opaque);

121 }

122 }

123 }

124

125 return sliceH;

126 }

127

128 int ff_init_desc_fmt_convert(SwsFilterDescriptor *desc, SwsSlice * src, SwsSlice *dst, uint32_t *pal)

129 {

130 ColorContext * li = av_malloc(sizeof(ColorContext));

131 if (!li)

132 return AVERROR(ENOMEM);

133 li->pal = pal;

134 desc->instance = li;

135

136 desc->alpha = isALPHA(src->fmt) && isALPHA(dst->fmt);

137 desc->src =src;

138 desc->dst = dst;

139 desc->process = &lum_convert;

140

141 return 0;

142 }

143

144

145 int ff_init_desc_hscale(SwsFilterDescriptor *desc, SwsSlice *src, SwsSlice *dst, uint16_t *filter, int * filter_pos, int filter_size, int xInc)

146 {

147 FilterContext *li = av_malloc(sizeof(FilterContext));

148 if (!li)

149 return AVERROR(ENOMEM);

150

151 li->filter = filter;

152 li->filter_pos = filter_pos;

153 li->filter_size = filter_size;

154 li->xInc = xInc;

155

156 desc->instance = li;

157

158 desc->alpha = isALPHA(src->fmt) && isALPHA(dst->fmt);

159 desc->src = src;

160 desc->dst = dst;

161

162 desc->process = &lum_h_scale;

163

164 return 0;

165 }

166

167 static int chr_h_scale(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)

168 {

169 FilterContext *instance = desc->instance;

170 int srcW = AV_CEIL_RSHIFT(desc->src->width, desc->src->h_chr_sub_sample);

171 int dstW = AV_CEIL_RSHIFT(desc->dst->width, desc->dst->h_chr_sub_sample);

172 int xInc = instance->xInc;

173

174 uint8_t ** src1 = desc->src->plane[1].line;

175 uint8_t ** dst1 = desc->dst->plane[1].line;

176 uint8_t ** src2 = desc->src->plane[2].line;

177 uint8_t ** dst2 = desc->dst->plane[2].line;

178

179 int src_pos1 = sliceY - desc->src->plane[1].sliceY;

180 int dst_pos1 = sliceY - desc->dst->plane[1].sliceY;

181

182 int src_pos2 = sliceY - desc->src->plane[2].sliceY;

183 int dst_pos2 = sliceY - desc->dst->plane[2].sliceY;

184

185 int i;

186 for (i = 0; i < sliceH; ++i) {

187 if (c->hcscale_fast) {

188 c->hcscale_fast(c, (uint16_t*)dst1[dst_pos1+i], (uint16_t*)dst2[dst_pos2+i], dstW, src1[src_pos1+i], src2[src_pos2+i], srcW, xInc);

189 } else {

190 c->hcScale(c, (uint16_t*)dst1[dst_pos1+i], dstW, src1[src_pos1+i], instance->filter, instance->filter_pos, instance->filter_size);

191 c->hcScale(c, (uint16_t*)dst2[dst_pos2+i], dstW, src2[src_pos2+i], instance->filter, instance->filter_pos, instance->filter_size);

192 }

193

194 if (c->chrConvertRange)

195 c->chrConvertRange((uint16_t*)dst1[dst_pos1+i], (uint16_t*)dst2[dst_pos2+i], dstW);

196

197 desc->dst->plane[1].sliceH += 1;

198 desc->dst->plane[2].sliceH += 1;

199 }

200 return sliceH;

201 }

202

203 static int chr_convert(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)

204 {

205 int srcW = AV_CEIL_RSHIFT(desc->src->width, desc->src->h_chr_sub_sample);

206 ColorContext * instance = desc->instance;

207 uint32_t * pal = instance->pal;

208

209 int sp0 = (sliceY - (desc->src->plane[0].sliceY >> desc->src->v_chr_sub_sample)) << desc->src->v_chr_sub_sample;

210 int sp1 = sliceY - desc->src->plane[1].sliceY;

211

212 int i;

213

214 desc->dst->plane[1].sliceY = sliceY;

215 desc->dst->plane[1].sliceH = sliceH;

216 desc->dst->plane[2].sliceY = sliceY;

217 desc->dst->plane[2].sliceH = sliceH;

218

219 for (i = 0; i < sliceH; ++i) {

220 const uint8_t * src[4] = { desc->src->plane[0].line[sp0+i],

221 desc->src->plane[1].line[sp1+i],

222 desc->src->plane[2].line[sp1+i],

223 desc->src->plane[3].line[sp0+i]};

224

225 uint8_t * dst1 = desc->dst->plane[1].line[i];

226 uint8_t * dst2 = desc->dst->plane[2].line[i];

227 if (c->chrToYV12) {

228 c->chrToYV12(dst1, dst2, src[0], src[1], src[2], srcW, pal, c->input_opaque);

229 } else if (c->readChrPlanar) {

230 c->readChrPlanar(dst1, dst2, src, srcW, c->input_rgb2yuv_table, c->input_opaque);

231 }

232 }

233 return sliceH;

234 }

235

236 int ff_init_desc_cfmt_convert(SwsFilterDescriptor *desc, SwsSlice * src, SwsSlice *dst, uint32_t *pal)

237 {

238 ColorContext * li = av_malloc(sizeof(ColorContext));

239 if (!li)

240 return AVERROR(ENOMEM);

241 li->pal = pal;

242 desc->instance = li;

243

244 desc->src =src;

245 desc->dst = dst;

246 desc->process = &chr_convert;

247

248 return 0;

249 }

250

251 int ff_init_desc_chscale(SwsFilterDescriptor *desc, SwsSlice *src, SwsSlice *dst, uint16_t *filter, int * filter_pos, int filter_size, int xInc)

252 {

253 FilterContext *li = av_malloc(sizeof(FilterContext));

254 if (!li)

255 return AVERROR(ENOMEM);

256

257 li->filter = filter;

258 li->filter_pos = filter_pos;

259 li->filter_size = filter_size;

260 li->xInc = xInc;

261

262 desc->instance = li;

263

264 desc->alpha = isALPHA(src->fmt) && isALPHA(dst->fmt);

265 desc->src = src;

266 desc->dst = dst;

267

268 desc->process = &chr_h_scale;

269

270 return 0;

271 }

272

273 static int no_chr_scale(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)

274 {

275 desc->dst->plane[1].sliceY = sliceY + sliceH - desc->dst->plane[1].available_lines;

276 desc->dst->plane[1].sliceH = desc->dst->plane[1].available_lines;

277 desc->dst->plane[2].sliceY = sliceY + sliceH - desc->dst->plane[2].available_lines;

278 desc->dst->plane[2].sliceH = desc->dst->plane[2].available_lines;

279 return 0;

280 }

281

282 int ff_init_desc_no_chr(SwsFilterDescriptor *desc, SwsSlice * src, SwsSlice *dst)

283 {

284 desc->src = src;

285 desc->dst = dst;

286 desc->alpha = 0;

287 desc->instance = NULL;

288 desc->process = &no_chr_scale;

289 return 0;

290 }

ff_init_desc_cfmt_convert

int ff_init_desc_cfmt_convert(SwsFilterDescriptor *desc, SwsSlice *src, SwsSlice *dst, uint32_t *pal)

initializes chr pixel format conversion descriptor

Definition: hscale.c:236

AVERROR

Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions

lum_h_scale

static int lum_h_scale(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)

Definition: hscale.c:39

ColorContext::pal

uint32_t * pal

Definition: hscale.c:36

src1

const pixel * src1

Definition: h264pred_template.c:421

ColorContext

Color conversion instance data.

Definition: hscale.c:34

ff_init_desc_hscale

int ff_init_desc_hscale(SwsFilterDescriptor *desc, SwsSlice *src, SwsSlice *dst, uint16_t *filter, int *filter_pos, int filter_size, int xInc)

initializes lum horizontal scaling descriptor

Definition: hscale.c:145

SwsFilterDescriptor

Struct which holds all necessary data for processing a slice.

Definition: swscale_internal.h:1083

filter

void(* filter)(uint8_t *src, int stride, int qscale)

Definition: h263dsp.c:29

lum_convert

static int lum_convert(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)

Definition: hscale.c:87

av_malloc

#define av_malloc(s)

Definition: tableprint_vlc.h:30

ff_init_desc_no_chr

int ff_init_desc_no_chr(SwsFilterDescriptor *desc, SwsSlice *src, SwsSlice *dst)

Definition: hscale.c:282

AV_CEIL_RSHIFT

#define AV_CEIL_RSHIFT(a, b)

Definition: common.h:60

NULL

#define NULL

Definition: coverity.c:32

FilterContext::filter_size

int filter_size

Definition: hscale.c:29

FilterContext

Scaler instance data.

Definition: hscale.c:25

ff_init_desc_chscale

int ff_init_desc_chscale(SwsFilterDescriptor *desc, SwsSlice *src, SwsSlice *dst, uint16_t *filter, int *filter_pos, int filter_size, int xInc)

initializes chr horizontal scaling descriptor

Definition: hscale.c:251

FilterContext::xInc

int xInc

Definition: hscale.c:30

chr_h_scale

static int chr_h_scale(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)

Definition: hscale.c:167

Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c

Definition: undefined.txt:32

dst

uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst

Definition: dsp.h:83

#define i(width, name, range_min, range_max)

Definition: cbs_h2645.c:256

src2

const pixel * src2

Definition: h264pred_template.c:422

swscale_internal.h

SwsSlice

Struct which defines a slice of an image to be scaled or an output for a scaled slice.