FFmpeg: libavcodec/libutvideodec.cpp Source File

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libavcodec

libutvideodec.cpp

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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 General Public

8 * License as published by the Free Software Foundation;

9 * version 2 of the License.

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 * General Public License for more details.

15 *

16 * You should have received a copy of the GNU 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 /**

22 * @file

23 * Known FOURCCs:

24 * 'ULY0' (YCbCr 4:2:0), 'ULY2' (YCbCr 4:2:2), 'ULRG' (RGB), 'ULRA' (RGBA)

25 */

27 extern "C" {

28 #include "avcodec.h"

29 }

31 #include "libutvideo.h"

32 #include "get_bits.h"

34 static av_cold int utvideo_decode_init(AVCodecContext *avctx)

35 {

36 UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;

37 UtVideoExtra info;

38 int format;

39 int begin_ret;

41 if (avctx->extradata_size != 4*4) {

42 av_log(avctx, AV_LOG_ERROR, "Extradata size mismatch.\n");

43 return -1;

44 }

46 /* Read extradata */

47 info.version = AV_RL32(avctx->extradata);

48 info.original_format = AV_RL32(avctx->extradata + 4);

49 info.frameinfo_size = AV_RL32(avctx->extradata + 8);

50 info.flags = AV_RL32(avctx->extradata + 12);

52 /* Pick format based on FOURCC */

53 switch (avctx->codec_tag) {

54 case MKTAG('U', 'L', 'Y', '0'):

55 avctx->pix_fmt = AV_PIX_FMT_YUV420P;

56 format = UTVF_YV12;

57 break;

58 case MKTAG('U', 'L', 'Y', '2'):

59 avctx->pix_fmt = AV_PIX_FMT_YUYV422;

60 format = UTVF_YUY2;

61 break;

62 case MKTAG('U', 'L', 'R', 'G'):

63 avctx->pix_fmt = AV_PIX_FMT_BGR24;

64 format = UTVF_RGB24_WIN;

65 break;

66 case MKTAG('U', 'L', 'R', 'A'):

67 avctx->pix_fmt = AV_PIX_FMT_RGB32;

68 format = UTVF_RGB32_WIN;

69 break;

70 default:

71 av_log(avctx, AV_LOG_ERROR,

72 "Not a Ut Video FOURCC: %X\n", avctx->codec_tag);

73 return -1;

74 }

76 /* Only allocate the buffer once */

77 utv->buf_size = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);

78 utv->buffer = (uint8_t *)av_malloc(utv->buf_size * sizeof(uint8_t));

80 if (utv->buffer == NULL) {

81 av_log(avctx, AV_LOG_ERROR, "Unable to allocate output buffer.\n");

82 return -1;

83 }

85 /* Allocate the output frame */

86 avctx->coded_frame = avcodec_alloc_frame();

88 /* Ut Video only supports 8-bit */

89 avctx->bits_per_raw_sample = 8;

91 /* Is it interlaced? */

92 avctx->coded_frame->interlaced_frame = info.flags & 0x800 ? 1 : 0;

94 /* Apparently Ut Video doesn't store this info... */

95 avctx->coded_frame->top_field_first = 1;

97 /*

98 * Create a Ut Video instance. Since the function wants

99 * an "interface name" string, pass it the name of the lib.

100 */

101 utv->codec = CCodec::CreateInstance(UNFCC(avctx->codec_tag), "libavcodec");

102

103 /* Initialize Decoding */

104 begin_ret = utv->codec->DecodeBegin(format, avctx->width, avctx->height,

105 CBGROSSWIDTH_WINDOWS, &info, sizeof(UtVideoExtra));

106

107 /* Check to see if the decoder initlized properly */

108 if (begin_ret != 0) {

109 av_log(avctx, AV_LOG_ERROR,

110 "Could not initialize decoder: %d\n", begin_ret);

111 return -1;

112 }

113

114 return 0;

115 }

116

117 static int utvideo_decode_frame(AVCodecContext *avctx, void *data,

118 int *got_frame, AVPacket *avpkt)

119 {

120 UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;

121 AVFrame *pic = avctx->coded_frame;

122 int w = avctx->width, h = avctx->height;

123

124 /* Set flags */

125 pic->reference = 0;

126 pic->pict_type = AV_PICTURE_TYPE_I;

127 pic->key_frame = 1;

128

129 /* Decode the frame */

130 utv->codec->DecodeFrame(utv->buffer, avpkt->data, true);

131

132 /* Set the output data depending on the colorspace */

133 switch (avctx->pix_fmt) {

134 case AV_PIX_FMT_YUV420P:

135 pic->linesize[0] = w;

136 pic->linesize[1] = pic->linesize[2] = w / 2;

137 pic->data[0] = utv->buffer;

138 pic->data[2] = utv->buffer + (w * h);

139 pic->data[1] = pic->data[2] + (w * h / 4);

140 break;

141 case AV_PIX_FMT_YUYV422:

142 pic->linesize[0] = w * 2;

143 pic->data[0] = utv->buffer;

144 break;

145 case AV_PIX_FMT_BGR24:

146 case AV_PIX_FMT_RGB32:

147 /* Make the linesize negative, since Ut Video uses bottom-up BGR */

148 pic->linesize[0] = -1 * w * (avctx->pix_fmt == AV_PIX_FMT_BGR24 ? 3 : 4);

149 pic->data[0] = utv->buffer + utv->buf_size + pic->linesize[0];

150 break;

151 }

152

153 *got_frame = 1;

154 *(AVFrame *)data = *pic;

155

156 return avpkt->size;

157 }

158

159 static av_cold int utvideo_decode_close(AVCodecContext *avctx)

160 {

161 UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;

162

163 /* Free output */

164 av_freep(&avctx->coded_frame);

165 av_freep(&utv->buffer);

166

167 /* Finish decoding and clean up the instance */

168 utv->codec->DecodeEnd();

169 CCodec::DeleteInstance(utv->codec);

170

171 return 0;

172 }

173

174 AVCodec ff_libutvideo_decoder = {

175 "libutvideo",

176 NULL_IF_CONFIG_SMALL("Ut Video"),

177 AVMEDIA_TYPE_VIDEO,

178 AV_CODEC_ID_UTVIDEO,

179 0, //capabilities

180 NULL, //supported_framerates

181 NULL, //pix_fmts

182 NULL, //supported_samplerates

183 NULL, //sample_fmts

184 NULL, //channel_layouts

185 0, //max_lowres

186 NULL, //priv_class

187 NULL, //profiles

188 sizeof(UtVideoContext),

189 NULL, //next

190 NULL, //init_thread_copy

191 NULL, //update_thread_context

192 NULL, //defaults

193 NULL, //init_static_data

194 utvideo_decode_init,

195 NULL, //encode

196 NULL, //encode2

197 utvideo_decode_frame,

198 utvideo_decode_close,

199 };

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