FFmpeg: libavformat/rsd.c Source File

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libavformat

rsd.c

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1 /*

2 * RSD 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 "libavcodec/bytestream.h"

23 #include "libavutil/intreadwrite.h"

24 #include "avformat.h"

25 #include "avio.h"

26 #include "internal.h"

28 static const AVCodecTag rsd_tags[] = {

29 { AV_CODEC_ID_ADPCM_THP, MKTAG('G','A','D','P') },

30 { AV_CODEC_ID_ADPCM_IMA_RAD, MKTAG('R','A','D','P') },

31 { AV_CODEC_ID_PCM_S16BE, MKTAG('P','C','M','B') },

32 { AV_CODEC_ID_PCM_S16LE, MKTAG('P','C','M',' ') },

33 { AV_CODEC_ID_NONE, 0 },

34 };

36 static const uint32_t rsd_unsupported_tags[] = {

37 MKTAG('O','G','G',' '),

38 MKTAG('V','A','G',' '),

39 MKTAG('W','A','D','P'),

40 MKTAG('X','A','D','P'),

41 MKTAG('X','M','A',' '),

42 };

44 static int rsd_probe(AVProbeData *p)

45 {

46 if (!memcmp(p->buf, "RSD", 3) &&

47 p->buf[3] - '0' >= 2 && p->buf[3] - '0' <= 6)

48 return AVPROBE_SCORE_EXTENSION;

49 return 0;

50 }

52 static int rsd_read_header(AVFormatContext *s)

53 {

54 AVIOContext *pb = s->pb;

55 int i, version, start = 0x800;

56 AVCodecContext *codec;

57 AVStream *st = avformat_new_stream(s, NULL);

59 if (!st)

60 return AVERROR(ENOMEM);

62 avio_skip(pb, 3); // "RSD"

63 version = avio_r8(pb) - '0';

65 codec = st->codec;

66 codec->codec_type = AVMEDIA_TYPE_AUDIO;

67 codec->codec_tag = avio_rl32(pb);

68 codec->codec_id = ff_codec_get_id(rsd_tags, codec->codec_tag);

69 if (!codec->codec_id) {

70 char tag_buf[5];

72 av_get_codec_tag_string(tag_buf, sizeof(tag_buf), codec->codec_tag);

73 for (i=0; i < FF_ARRAY_ELEMS(rsd_unsupported_tags); i++) {

74 if (codec->codec_tag == rsd_unsupported_tags[i]) {

75 avpriv_request_sample(s, "Codec tag: %s", tag_buf);

76 return AVERROR_PATCHWELCOME;

77 }

78 }

79 av_log(s, AV_LOG_ERROR, "Unknown codec tag: %s\n", tag_buf);

80 return AVERROR_INVALIDDATA;

81 }

83 codec->channels = avio_rl32(pb);

84 if (!codec->channels)

85 return AVERROR_INVALIDDATA;

87 avio_skip(pb, 4); // Bit depth

88 codec->sample_rate = avio_rl32(pb);

89 if (!codec->sample_rate)

90 return AVERROR_INVALIDDATA;

92 avio_skip(pb, 4); // Unknown

94 switch (codec->codec_id) {

95 case AV_CODEC_ID_ADPCM_IMA_RAD:

96 codec->block_align = 20 * codec->channels;

97 if (pb->seekable)

98 st->duration = av_get_audio_frame_duration(codec, avio_size(pb) - start);

99 break;

100 case AV_CODEC_ID_ADPCM_THP:

101 /* RSD3GADP is mono, so only alloc enough memory

102 to store the coeff table for a single channel. */

103

104 codec->extradata_size = 32;

105 codec->extradata = av_malloc(codec->extradata_size);

106 if (!codec->extradata)

107 return AVERROR(ENOMEM);

108

109 start = avio_rl32(pb);

110

111 if (avio_read(s->pb, codec->extradata, 32) != 32)

112 return AVERROR_INVALIDDATA;

113

114 for (i = 0; i < 16; i++)

115 AV_WB16(codec->extradata + i * 2, AV_RL16(codec->extradata + i * 2));

116

117 if (pb->seekable)

118 st->duration = (avio_size(pb) - start) / 8 * 14;

119 break;

120 case AV_CODEC_ID_PCM_S16LE:

121 case AV_CODEC_ID_PCM_S16BE:

122 if (version != 4)

123 start = avio_rl32(pb);

124

125 if (pb->seekable)

126 st->duration = (avio_size(pb) - start) / 2 / codec->channels;

127 break;

128 }

129

130 avio_skip(pb, start - avio_tell(pb));

131

132 avpriv_set_pts_info(st, 64, 1, codec->sample_rate);

133

134 return 0;

135 }

136

137 static int rsd_read_packet(AVFormatContext *s, AVPacket *pkt)

138 {

139 AVCodecContext *codec = s->streams[0]->codec;

140 int ret, size = 1024;

141

142 if (url_feof(s->pb))

143 return AVERROR_EOF;

144

145 if (codec->codec_id == AV_CODEC_ID_ADPCM_IMA_RAD)

146 ret = av_get_packet(s->pb, pkt, codec->block_align);

147 else

148 ret = av_get_packet(s->pb, pkt, size);

149

150 if (ret != size) {

151 if (ret < 0) {

152 av_free_packet(pkt);

153 return ret;

154 }

155 av_shrink_packet(pkt, ret);

156 }

157 pkt->stream_index = 0;

158

159 return ret;

160 }

161

162 AVInputFormat ff_rsd_demuxer = {

163 .name = "rsd",

164 .long_name = NULL_IF_CONFIG_SMALL("GameCube RSD"),

165 .read_probe = rsd_probe,

166 .read_header = rsd_read_header,

167 .read_packet = rsd_read_packet,

168 .extensions = "rsd",

169 .codec_tag = (const AVCodecTag* const []){rsd_tags, 0},

170 };

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