FFmpeg: libavformat/siff.c Source File

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libavformat

siff.c

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1 /*

2 * Beam Software SIFF demuxer

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg is free software; you can redistribute it and/or

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

12 * FFmpeg is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

18 * License along with FFmpeg; if not, write to the Free Software

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

20 */

22 #include "libavutil/channel_layout.h"

23 #include "libavutil/intreadwrite.h"

25 #include "avformat.h"

26 #include "internal.h"

27 #include "avio_internal.h"

29 enum SIFFTags {

30 TAG_SIFF = MKTAG('S', 'I', 'F', 'F'),

31 TAG_BODY = MKTAG('B', 'O', 'D', 'Y'),

32 TAG_VBHD = MKTAG('V', 'B', 'H', 'D'),

33 TAG_SHDR = MKTAG('S', 'H', 'D', 'R'),

34 TAG_VBV1 = MKTAG('V', 'B', 'V', '1'),

35 TAG_SOUN = MKTAG('S', 'O', 'U', 'N'),

36 };

38 enum VBFlags {

39 VB_HAS_GMC = 0x01,

40 VB_HAS_AUDIO = 0x04,

41 VB_HAS_VIDEO = 0x08,

42 VB_HAS_PALETTE = 0x10,

43 VB_HAS_LENGTH = 0x20

44 };

46 typedef struct SIFFContext {

47 int frames;

48 int cur_frame;

49 int rate;

50 int bits;

51 int block_align;

53 int has_video;

54 int has_audio;

56 int curstrm;

57 int pktsize;

58 int gmcsize;

59 int sndsize;

61 int flags;

62 uint8_t gmc[4];

63 } SIFFContext;

65 static int siff_probe(AVProbeData *p)

66 {

67 uint32_t tag = AV_RL32(p->buf + 8);

68 /* check file header */

69 if (AV_RL32(p->buf) != TAG_SIFF ||

70 (tag != TAG_VBV1 && tag != TAG_SOUN))

71 return 0;

72 return AVPROBE_SCORE_MAX;

73 }

75 static int create_audio_stream(AVFormatContext *s, SIFFContext *c)

76 {

77 AVStream *ast;

78 ast = avformat_new_stream(s, NULL);

79 if (!ast)

80 return AVERROR(ENOMEM);

81 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;

82 ast->codec->codec_id = AV_CODEC_ID_PCM_U8;

83 ast->codec->channels = 1;

84 ast->codec->channel_layout = AV_CH_LAYOUT_MONO;

85 ast->codec->bits_per_coded_sample = 8;

86 ast->codec->sample_rate = c->rate;

87 avpriv_set_pts_info(ast, 16, 1, c->rate);

88 ast->start_time = 0;

89 return 0;

90 }

92 static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)

93 {

94 AVStream *st;

95 int width, height;

97 if (avio_rl32(pb) != TAG_VBHD) {

98 av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");

99 return AVERROR_INVALIDDATA;

100 }

101 if (avio_rb32(pb) != 32) {

102 av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");

103 return AVERROR_INVALIDDATA;

104 }

105 if (avio_rl16(pb) != 1) {

106 av_log(s, AV_LOG_ERROR, "Incorrect header version\n");

107 return AVERROR_INVALIDDATA;

108 }

109 width = avio_rl16(pb);

110 height = avio_rl16(pb);

111 avio_skip(pb, 4);

112 c->frames = avio_rl16(pb);

113 if (!c->frames) {

114 av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");

115 return AVERROR_INVALIDDATA;

116 }

117 c->bits = avio_rl16(pb);

118 c->rate = avio_rl16(pb);

119 c->block_align = c->rate * (c->bits >> 3);

120

121 avio_skip(pb, 16); // zeroes

122

123 st = avformat_new_stream(s, NULL);

124 if (!st)

125 return AVERROR(ENOMEM);

126 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

127 st->codec->codec_id = AV_CODEC_ID_VB;

128 st->codec->codec_tag = MKTAG('V', 'B', 'V', '1');

129 st->codec->width = width;

130 st->codec->height = height;

131 st->codec->pix_fmt = AV_PIX_FMT_PAL8;

132 st->nb_frames =

133 st->duration = c->frames;

134 avpriv_set_pts_info(st, 16, 1, 12);

135

136 c->cur_frame = 0;

137 c->has_video = 1;

138 c->has_audio = !!c->rate;

139 c->curstrm = -1;

140 if (c->has_audio)

141 return create_audio_stream(s, c);

142 return 0;

143 }

144

145 static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)

146 {

147 if (avio_rl32(pb) != TAG_SHDR) {

148 av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");

149 return AVERROR_INVALIDDATA;

150 }

151 if (avio_rb32(pb) != 8) {

152 av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");

153 return AVERROR_INVALIDDATA;

154 }

155 avio_skip(pb, 4); // unknown value

156 c->rate = avio_rl16(pb);

157 c->bits = avio_rl16(pb);

158 c->block_align = c->rate * (c->bits >> 3);

159 return create_audio_stream(s, c);

160 }

161

162 static int siff_read_header(AVFormatContext *s)

163 {

164 AVIOContext *pb = s->pb;

165 SIFFContext *c = s->priv_data;

166 uint32_t tag;

167 int ret;

168

169 if (avio_rl32(pb) != TAG_SIFF)

170 return AVERROR_INVALIDDATA;

171 avio_skip(pb, 4); // ignore size

172 tag = avio_rl32(pb);

173

174 if (tag != TAG_VBV1 && tag != TAG_SOUN) {

175 av_log(s, AV_LOG_ERROR, "Not a VBV file\n");

176 return AVERROR_INVALIDDATA;

177 }

178

179 if (tag == TAG_VBV1 && (ret = siff_parse_vbv1(s, c, pb)) < 0)

180 return ret;

181 if (tag == TAG_SOUN && (ret = siff_parse_soun(s, c, pb)) < 0)

182 return ret;

183 if (avio_rl32(pb) != MKTAG('B', 'O', 'D', 'Y')) {

184 av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");

185 return AVERROR_INVALIDDATA;

186 }

187 avio_skip(pb, 4); // ignore size

188

189 return 0;

190 }

191

192 static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)

193 {

194 SIFFContext *c = s->priv_data;

195 int size;

196

197 if (c->has_video) {

198 if (c->cur_frame >= c->frames)

199 return AVERROR_EOF;

200 if (c->curstrm == -1) {

201 c->pktsize = avio_rl32(s->pb) - 4;

202 c->flags = avio_rl16(s->pb);

203 c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;

204 if (c->gmcsize)

205 avio_read(s->pb, c->gmc, c->gmcsize);

206 c->sndsize = (c->flags & VB_HAS_AUDIO) ? avio_rl32(s->pb) : 0;

207 c->curstrm = !!(c->flags & VB_HAS_AUDIO);

208 }

209

210 if (!c->curstrm) {

211 size = c->pktsize - c->sndsize - c->gmcsize - 2;

212 size = ffio_limit(s->pb, size);

213 if (size < 0 || c->pktsize < c->sndsize)

214 return AVERROR_INVALIDDATA;

215 if (av_new_packet(pkt, size + c->gmcsize + 2) < 0)

216 return AVERROR(ENOMEM);

217 AV_WL16(pkt->data, c->flags);

218 if (c->gmcsize)

219 memcpy(pkt->data + 2, c->gmc, c->gmcsize);

220 if (avio_read(s->pb, pkt->data + 2 + c->gmcsize, size) != size) {

221 av_free_packet(pkt);

222 return AVERROR_INVALIDDATA;

223 }

224 pkt->stream_index = 0;

225 c->curstrm = -1;

226 } else {

227 if ((size = av_get_packet(s->pb, pkt, c->sndsize - 4)) < 0)

228 return AVERROR(EIO);

229 pkt->stream_index = 1;

230 pkt->duration = size;

231 c->curstrm = 0;

232 }

233 if (!c->cur_frame || c->curstrm)

234 pkt->flags |= AV_PKT_FLAG_KEY;

235 if (c->curstrm == -1)

236 c->cur_frame++;

237 } else {

238 size = av_get_packet(s->pb, pkt, c->block_align);

239 if (!size)

240 return AVERROR_EOF;

241 if (size < 0)

242 return AVERROR(EIO);

243 pkt->duration = size;

244 }

245 return pkt->size;

246 }

247

248 AVInputFormat ff_siff_demuxer = {

249 .name = "siff",

250 .long_name = NULL_IF_CONFIG_SMALL("Beam Software SIFF"),

251 .priv_data_size = sizeof(SIFFContext),

252 .read_probe = siff_probe,

253 .read_header = siff_read_header,

254 .read_packet = siff_read_packet,

255 .extensions = "vb,son",

256 };

Generated on Sun Mar 8 2015 02:35:12 for FFmpeg by doxygen 1.8.2