FFmpeg: libavformat/bink.c Source File

FFmpeg

[フレーム]

libavformat

bink.c

Go to the documentation of this file.

1 /*

2 * Bink demuxer

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 /**

24 * @file

25 * Bink demuxer

26 *

27 * Technical details here:

28 * http://wiki.multimedia.cx/index.php?title=Bink_Container

29 */

31 #include "libavutil/channel_layout.h"

32 #include "libavutil/intreadwrite.h"

33 #include "avformat.h"

34 #include "internal.h"

36 enum BinkAudFlags {

37 BINK_AUD_16BITS = 0x4000, ///< prefer 16-bit output

38 BINK_AUD_STEREO = 0x2000,

39 BINK_AUD_USEDCT = 0x1000,

40 };

42 #define BINK_EXTRADATA_SIZE 1

43 #define BINK_MAX_AUDIO_TRACKS 256

44 #define BINK_MAX_WIDTH 7680

45 #define BINK_MAX_HEIGHT 4800

47 typedef struct {

48 uint32_t file_size;

50 uint32_t num_audio_tracks;

51 int current_track; ///< audio track to return in next packet

52 int64_t video_pts;

53 int64_t audio_pts[BINK_MAX_AUDIO_TRACKS];

55 uint32_t remain_packet_size;

56 } BinkDemuxContext;

58 static int probe(AVProbeData *p)

59 {

60 const uint8_t *b = p->buf;

62 if ( b[0] == 'B' && b[1] == 'I' && b[2] == 'K' &&

63 (b[3] == 'b' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' || b[3] == 'i') &&

64 AV_RL32(b+8) > 0 && // num_frames

65 AV_RL32(b+20) > 0 && AV_RL32(b+20) <= BINK_MAX_WIDTH &&

66 AV_RL32(b+24) > 0 && AV_RL32(b+24) <= BINK_MAX_HEIGHT &&

67 AV_RL32(b+28) > 0 && AV_RL32(b+32) > 0) // fps num,den

68 return AVPROBE_SCORE_MAX;

69 return 0;

70 }

72 static int read_header(AVFormatContext *s)

73 {

74 BinkDemuxContext *bink = s->priv_data;

75 AVIOContext *pb = s->pb;

76 uint32_t fps_num, fps_den;

77 AVStream *vst, *ast;

78 unsigned int i;

79 uint32_t pos, next_pos;

80 uint16_t flags;

81 int keyframe;

83 vst = avformat_new_stream(s, NULL);

84 if (!vst)

85 return AVERROR(ENOMEM);

87 vst->codec->codec_tag = avio_rl32(pb);

89 bink->file_size = avio_rl32(pb) + 8;

90 vst->duration = avio_rl32(pb);

92 if (vst->duration > 1000000) {

93 av_log(s, AV_LOG_ERROR, "invalid header: more than 1000000 frames\n");

94 return AVERROR(EIO);

95 }

97 if (avio_rl32(pb) > bink->file_size) {

98 av_log(s, AV_LOG_ERROR,

99 "invalid header: largest frame size greater than file size\n");

100 return AVERROR(EIO);

101 }

102

103 avio_skip(pb, 4);

104

105 vst->codec->width = avio_rl32(pb);

106 vst->codec->height = avio_rl32(pb);

107

108 fps_num = avio_rl32(pb);

109 fps_den = avio_rl32(pb);

110 if (fps_num == 0 || fps_den == 0) {

111 av_log(s, AV_LOG_ERROR, "invalid header: invalid fps (%d/%d)\n", fps_num, fps_den);

112 return AVERROR(EIO);

113 }

114 avpriv_set_pts_info(vst, 64, fps_den, fps_num);

115 vst->avg_frame_rate = av_inv_q(vst->time_base);

116

117 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;

118 vst->codec->codec_id = AV_CODEC_ID_BINKVIDEO;

119 if (ff_alloc_extradata(vst->codec, 4))

120 return AVERROR(ENOMEM);

121 avio_read(pb, vst->codec->extradata, 4);

122

123 bink->num_audio_tracks = avio_rl32(pb);

124

125 if (bink->num_audio_tracks > BINK_MAX_AUDIO_TRACKS) {

126 av_log(s, AV_LOG_ERROR,

127 "invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%d)\n",

128 bink->num_audio_tracks);

129 return AVERROR(EIO);

130 }

131

132 if (bink->num_audio_tracks) {

133 avio_skip(pb, 4 * bink->num_audio_tracks);

134

135 for (i = 0; i < bink->num_audio_tracks; i++) {

136 ast = avformat_new_stream(s, NULL);

137 if (!ast)

138 return AVERROR(ENOMEM);

139 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;

140 ast->codec->codec_tag = 0;

141 ast->codec->sample_rate = avio_rl16(pb);

142 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);

143 flags = avio_rl16(pb);

144 ast->codec->codec_id = flags & BINK_AUD_USEDCT ?

145 AV_CODEC_ID_BINKAUDIO_DCT : AV_CODEC_ID_BINKAUDIO_RDFT;

146 if (flags & BINK_AUD_STEREO) {

147 ast->codec->channels = 2;

148 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;

149 } else {

150 ast->codec->channels = 1;

151 ast->codec->channel_layout = AV_CH_LAYOUT_MONO;

152 }

153 if (ff_alloc_extradata(ast->codec, 4))

154 return AVERROR(ENOMEM);

155 AV_WL32(ast->codec->extradata, vst->codec->codec_tag);

156 }

157

158 for (i = 0; i < bink->num_audio_tracks; i++)

159 s->streams[i + 1]->id = avio_rl32(pb);

160 }

161

162 /* frame index table */

163 next_pos = avio_rl32(pb);

164 for (i = 0; i < vst->duration; i++) {

165 pos = next_pos;

166 if (i == vst->duration - 1) {

167 next_pos = bink->file_size;

168 keyframe = 0;

169 } else {

170 next_pos = avio_rl32(pb);

171 keyframe = pos & 1;

172 }

173 pos &= ~1;

174 next_pos &= ~1;

175

176 if (next_pos <= pos) {

177 av_log(s, AV_LOG_ERROR, "invalid frame index table\n");

178 return AVERROR(EIO);

179 }

180 av_add_index_entry(vst, pos, i, next_pos - pos, 0,

181 keyframe ? AVINDEX_KEYFRAME : 0);

182 }

183

184 avio_skip(pb, 4);

185

186 bink->current_track = -1;

187 return 0;

188 }

189

190 static int read_packet(AVFormatContext *s, AVPacket *pkt)

191 {

192 BinkDemuxContext *bink = s->priv_data;

193 AVIOContext *pb = s->pb;

194 int ret;

195

196 if (bink->current_track < 0) {

197 int index_entry;

198 AVStream *st = s->streams[0]; // stream 0 is video stream with index

199

200 if (bink->video_pts >= st->duration)

201 return AVERROR_EOF;

202

203 index_entry = av_index_search_timestamp(st, bink->video_pts,

204 AVSEEK_FLAG_ANY);

205 if (index_entry < 0) {

206 av_log(s, AV_LOG_ERROR,

207 "could not find index entry for frame %"PRId64"\n",

208 bink->video_pts);

209 return AVERROR(EIO);

210 }

211

212 bink->remain_packet_size = st->index_entries[index_entry].size;

213 bink->current_track = 0;

214 }

215

216 while (bink->current_track < bink->num_audio_tracks) {

217 uint32_t audio_size = avio_rl32(pb);

218 if (audio_size > bink->remain_packet_size - 4) {

219 av_log(s, AV_LOG_ERROR,

220 "frame %"PRId64": audio size in header (%u) > size of packet left (%u)\n",

221 bink->video_pts, audio_size, bink->remain_packet_size);

222 return AVERROR(EIO);

223 }

224 bink->remain_packet_size -= 4 + audio_size;

225 bink->current_track++;

226 if (audio_size >= 4) {

227 /* get one audio packet per track */

228 if ((ret = av_get_packet(pb, pkt, audio_size)) < 0)

229 return ret;

230 pkt->stream_index = bink->current_track;

231 pkt->pts = bink->audio_pts[bink->current_track - 1];

232

233 /* Each audio packet reports the number of decompressed samples

234 (in bytes). We use this value to calcuate the audio PTS */

235 if (pkt->size >= 4)

236 bink->audio_pts[bink->current_track -1] +=

237 AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codec->channels);

238 return 0;

239 } else {

240 avio_skip(pb, audio_size);

241 }

242 }

243

244 /* get video packet */

245 if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0)

246 return ret;

247 pkt->stream_index = 0;

248 pkt->pts = bink->video_pts++;

249 pkt->flags |= AV_PKT_FLAG_KEY;

250

251 /* -1 instructs the next call to read_packet() to read the next frame */

252 bink->current_track = -1;

253

254 return 0;

255 }

256

257 static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

258 {

259 BinkDemuxContext *bink = s->priv_data;

260 AVStream *vst = s->streams[0];

261

262 if (!s->pb->seekable)

263 return -1;

264

265 /* seek to the first frame */

266 if (avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET) < 0)

267 return -1;

268

269 bink->video_pts = 0;

270 memset(bink->audio_pts, 0, sizeof(bink->audio_pts));

271 bink->current_track = -1;

272 return 0;

273 }

274

275 AVInputFormat ff_bink_demuxer = {

276 .name = "bink",

277 .long_name = NULL_IF_CONFIG_SMALL("Bink"),

278 .priv_data_size = sizeof(BinkDemuxContext),

279 .read_probe = probe,

280 .read_header = read_header,

281 .read_packet = read_packet,

282 .read_seek = read_seek,

283 };

Generated on Sat Jan 25 2014 19:51:45 for FFmpeg by doxygen 1.8.2