FFmpeg: libavfilter/buffer.c Source File

FFmpeg

[フレーム]

libavfilter

buffer.c

Go to the documentation of this file.

1 /*

2 * Copyright Stefano Sabatini <stefasab gmail com>

3 * Copyright Anton Khirnov <anton khirnov net>

4 * Copyright Michael Niedermayer <michaelni gmx at>

5 *

6 * This file is part of FFmpeg.

7 *

8 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software

20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

21 */

23 #include "libavutil/channel_layout.h"

24 #include "libavutil/avassert.h"

25 #include "libavutil/common.h"

26 #include "libavutil/imgutils.h"

27 #include "libavcodec/avcodec.h"

29 #include "avfilter.h"

30 #include "internal.h"

31 #include "audio.h"

32 #include "avcodec.h"

34 void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)

35 {

36 if (ptr->extended_data != ptr->data)

37 av_freep(&ptr->extended_data);

38 av_free(ptr->data[0]);

39 av_free(ptr);

40 }

42 static void copy_video_props(AVFilterBufferRefVideoProps *dst, AVFilterBufferRefVideoProps *src) {

43 *dst = *src;

44 if (src->qp_table) {

45 int qsize = src->qp_table_size;

46 dst->qp_table = av_malloc(qsize);

47 memcpy(dst->qp_table, src->qp_table, qsize);

48 }

49 }

51 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)

52 {

53 AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));

54 if (!ret)

55 return NULL;

56 *ret = *ref;

58 ret->metadata = NULL;

59 av_dict_copy(&ret->metadata, ref->metadata, 0);

61 if (ref->type == AVMEDIA_TYPE_VIDEO) {

62 ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));

63 if (!ret->video) {

64 av_free(ret);

65 return NULL;

66 }

67 copy_video_props(ret->video, ref->video);

68 ret->extended_data = ret->data;

69 } else if (ref->type == AVMEDIA_TYPE_AUDIO) {

70 ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));

71 if (!ret->audio) {

72 av_free(ret);

73 return NULL;

74 }

75 *ret->audio = *ref->audio;

77 if (ref->extended_data && ref->extended_data != ref->data) {

78 int nb_channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);

79 if (!(ret->extended_data = av_malloc(sizeof(*ret->extended_data) *

80 nb_channels))) {

81 av_freep(&ret->audio);

82 av_freep(&ret);

83 return NULL;

84 }

85 memcpy(ret->extended_data, ref->extended_data,

86 sizeof(*ret->extended_data) * nb_channels);

87 } else

88 ret->extended_data = ret->data;

89 }

90 ret->perms &= pmask;

91 ret->buf->refcount ++;

92 return ret;

93 }

95 void ff_free_pool(AVFilterPool *pool)

96 {

97 int i;

99 av_assert0(pool->refcount > 0);

100

101 for (i = 0; i < POOL_SIZE; i++) {

102 if (pool->pic[i]) {

103 AVFilterBufferRef *picref = pool->pic[i];

104 /* free buffer: picrefs stored in the pool are not

105 * supposed to contain a free callback */

106 av_assert0(!picref->buf->refcount);

107 av_freep(&picref->buf->data[0]);

108 av_freep(&picref->buf);

109

110 av_freep(&picref->audio);

111 av_assert0(!picref->video || !picref->video->qp_table);

112 av_freep(&picref->video);

113 av_freep(&pool->pic[i]);

114 pool->count--;

115 }

116 }

117 pool->draining = 1;

118

119 if (!--pool->refcount) {

120 av_assert0(!pool->count);

121 av_free(pool);

122 }

123 }

124

125 static void store_in_pool(AVFilterBufferRef *ref)

126 {

127 int i;

128 AVFilterPool *pool= ref->buf->priv;

129

130 av_assert0(ref->buf->data[0]);

131 av_assert0(pool->refcount>0);

132

133 if (ref->video)

134 av_freep(&ref->video->qp_table);

135

136 if (pool->count == POOL_SIZE) {

137 AVFilterBufferRef *ref1 = pool->pic[0];

138 av_freep(&ref1->video);

139 av_freep(&ref1->audio);

140 av_freep(&ref1->buf->data[0]);

141 av_freep(&ref1->buf);

142 av_free(ref1);

143 memmove(&pool->pic[0], &pool->pic[1], sizeof(void*)*(POOL_SIZE-1));

144 pool->count--;

145 pool->pic[POOL_SIZE-1] = NULL;

146 }

147

148 for (i = 0; i < POOL_SIZE; i++) {

149 if (!pool->pic[i]) {

150 pool->pic[i] = ref;

151 pool->count++;

152 break;

153 }

154 }

155 if (pool->draining) {

156 ff_free_pool(pool);

157 } else

158 --pool->refcount;

159 }

160

161 void avfilter_unref_buffer(AVFilterBufferRef *ref)

162 {

163 if (!ref)

164 return;

165 av_assert0(ref->buf->refcount > 0);

166 if (!(--ref->buf->refcount)) {

167 if (!ref->buf->free) {

168 store_in_pool(ref);

169 return;

170 }

171 ref->buf->free(ref->buf);

172 }

173 if (ref->extended_data != ref->data)

174 av_freep(&ref->extended_data);

175 if (ref->video)

176 av_freep(&ref->video->qp_table);

177 av_freep(&ref->video);

178 av_freep(&ref->audio);

179 av_dict_free(&ref->metadata);

180 av_free(ref);

181 }

182

183 void avfilter_unref_bufferp(AVFilterBufferRef **ref)

184 {

185 avfilter_unref_buffer(*ref);

186 *ref = NULL;

187 }

188

189 void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src)

190 {

191 // copy common properties

192 dst->pts = src->pts;

193 dst->pos = src->pos;

194

195 switch (src->type) {

196 case AVMEDIA_TYPE_VIDEO: {

197 if (dst->video->qp_table)

198 av_freep(&dst->video->qp_table);

199 copy_video_props(dst->video, src->video);

200 break;

201 }

202 case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;

203 default: break;

204 }

205

206 av_dict_free(&dst->metadata);

207 av_dict_copy(&dst->metadata, src->metadata, 0);

208 }

209

210 AVFilterBufferRef *ff_copy_buffer_ref(AVFilterLink *outlink,

211 AVFilterBufferRef *ref)

212 {

213 AVFilterBufferRef *buf;

214 int channels;

215

216 switch (outlink->type) {

217

218 case AVMEDIA_TYPE_VIDEO:

219 buf = ff_get_video_buffer(outlink, AV_PERM_WRITE,

220 ref->video->w, ref->video->h);

221 if(!buf)

222 return NULL;

223 av_image_copy(buf->data, buf->linesize,

224 (void*)ref->data, ref->linesize,

225 ref->format, ref->video->w, ref->video->h);

226 break;

227

228 case AVMEDIA_TYPE_AUDIO:

229 buf = ff_get_audio_buffer(outlink, AV_PERM_WRITE,

230 ref->audio->nb_samples);

231 if(!buf)

232 return NULL;

233 channels = ref->audio->channels;

234 av_samples_copy(buf->extended_data, ref->buf->extended_data,

235 0, 0, ref->audio->nb_samples,

236 channels,

237 ref->format);

238 break;

239

240 default:

241 return NULL;

242 }

243 avfilter_copy_buffer_ref_props(buf, ref);

244 return buf;

245 }

Generated on Sat May 25 2013 04:01:14 for FFmpeg by doxygen 1.8.2