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1 | /* |
2 | * Psygnosis YOP demuxer | |
3 | * | |
4 | * Copyright (C) 2010 Mohamed Naufal Basheer <naufal11@gmail.com> | |
5 | * derived from the code by | |
6 | * Copyright (C) 2009 Thomas P. Higdon <thomas.p.higdon@gmail.com> | |
7 | * | |
8 | * This file is part of FFmpeg. | |
9 | * | |
10 | * FFmpeg is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU Lesser General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2.1 of the License, or (at your option) any later version. | |
14 | * | |
15 | * FFmpeg is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public | |
21 | * License along with FFmpeg; if not, write to the Free Software | |
22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
23 | */ | |
24 | ||
25 | #include "libavutil/channel_layout.h" | |
26 | #include "libavutil/intreadwrite.h" | |
27 | #include "avformat.h" | |
28 | #include "internal.h" | |
29 | ||
30 | typedef struct yop_dec_context { | |
31 | AVPacket video_packet; | |
32 | ||
33 | int odd_frame; | |
34 | int frame_size; | |
35 | int audio_block_length; | |
36 | int palette_size; | |
37 | } YopDecContext; | |
38 | ||
39 | static int yop_probe(AVProbeData *probe_packet) | |
40 | { | |
41 | if (AV_RB16(probe_packet->buf) == AV_RB16("YO") && | |
42 | probe_packet->buf[2]<10 && | |
43 | probe_packet->buf[3]<10 && | |
44 | probe_packet->buf[6] && | |
45 | probe_packet->buf[7] && | |
46 | !(probe_packet->buf[8] & 1) && | |
47 | !(probe_packet->buf[10] & 1) && | |
48 | AV_RL16(probe_packet->buf + 12 + 6) >= 920 && | |
49 | AV_RL16(probe_packet->buf + 12 + 6) < probe_packet->buf[12] * 3 + 4 + probe_packet->buf[7] * 2048 | |
50 | ) | |
51 | return AVPROBE_SCORE_MAX * 3 / 4; | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
56 | static int yop_read_header(AVFormatContext *s) | |
57 | { | |
58 | YopDecContext *yop = s->priv_data; | |
59 | AVIOContext *pb = s->pb; | |
60 | ||
61 | AVCodecContext *audio_dec, *video_dec; | |
62 | AVStream *audio_stream, *video_stream; | |
63 | ||
64 | int frame_rate, ret; | |
65 | ||
66 | audio_stream = avformat_new_stream(s, NULL); | |
67 | video_stream = avformat_new_stream(s, NULL); | |
68 | if (!audio_stream || !video_stream) | |
69 | return AVERROR(ENOMEM); | |
70 | ||
71 | // Extra data that will be passed to the decoder | |
72 | if (ff_alloc_extradata(video_stream->codec, 8)) | |
73 | return AVERROR(ENOMEM); | |
74 | ||
75 | // Audio | |
76 | audio_dec = audio_stream->codec; | |
77 | audio_dec->codec_type = AVMEDIA_TYPE_AUDIO; | |
78 | audio_dec->codec_id = AV_CODEC_ID_ADPCM_IMA_APC; | |
79 | audio_dec->channels = 1; | |
80 | audio_dec->channel_layout = AV_CH_LAYOUT_MONO; | |
81 | audio_dec->sample_rate = 22050; | |
82 | ||
83 | // Video | |
84 | video_dec = video_stream->codec; | |
85 | video_dec->codec_type = AVMEDIA_TYPE_VIDEO; | |
86 | video_dec->codec_id = AV_CODEC_ID_YOP; | |
87 | ||
88 | avio_skip(pb, 6); | |
89 | ||
90 | frame_rate = avio_r8(pb); | |
91 | yop->frame_size = avio_r8(pb) * 2048; | |
92 | video_dec->width = avio_rl16(pb); | |
93 | video_dec->height = avio_rl16(pb); | |
94 | ||
95 | video_stream->sample_aspect_ratio = (AVRational){1, 2}; | |
96 | ||
97 | ret = avio_read(pb, video_dec->extradata, 8); | |
98 | if (ret < 8) | |
99 | return ret < 0 ? ret : AVERROR_EOF; | |
100 | ||
101 | yop->palette_size = video_dec->extradata[0] * 3 + 4; | |
102 | yop->audio_block_length = AV_RL16(video_dec->extradata + 6); | |
103 | ||
104 | video_dec->bit_rate = 8 * (yop->frame_size - yop->audio_block_length) * frame_rate; | |
105 | ||
106 | // 1840 samples per frame, 1 nibble per sample; hence 1840/2 = 920 | |
107 | if (yop->audio_block_length < 920 || | |
108 | yop->audio_block_length + yop->palette_size >= yop->frame_size) { | |
109 | av_log(s, AV_LOG_ERROR, "YOP has invalid header\n"); | |
110 | return AVERROR_INVALIDDATA; | |
111 | } | |
112 | ||
113 | avio_seek(pb, 2048, SEEK_SET); | |
114 | ||
115 | avpriv_set_pts_info(video_stream, 32, 1, frame_rate); | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static int yop_read_packet(AVFormatContext *s, AVPacket *pkt) | |
121 | { | |
122 | YopDecContext *yop = s->priv_data; | |
123 | AVIOContext *pb = s->pb; | |
124 | ||
125 | int ret; | |
126 | int actual_video_data_size = yop->frame_size - | |
127 | yop->audio_block_length - yop->palette_size; | |
128 | ||
129 | yop->video_packet.stream_index = 1; | |
130 | ||
131 | if (yop->video_packet.data) { | |
132 | *pkt = yop->video_packet; | |
133 | yop->video_packet.data = NULL; | |
134 | yop->video_packet.buf = NULL; | |
135 | #if FF_API_DESTRUCT_PACKET | |
136 | FF_DISABLE_DEPRECATION_WARNINGS | |
137 | yop->video_packet.destruct = NULL; | |
138 | FF_ENABLE_DEPRECATION_WARNINGS | |
139 | #endif | |
140 | yop->video_packet.size = 0; | |
141 | pkt->data[0] = yop->odd_frame; | |
142 | pkt->flags |= AV_PKT_FLAG_KEY; | |
143 | yop->odd_frame ^= 1; | |
144 | return pkt->size; | |
145 | } | |
146 | ret = av_new_packet(&yop->video_packet, | |
147 | yop->frame_size - yop->audio_block_length); | |
148 | if (ret < 0) | |
149 | return ret; | |
150 | ||
151 | yop->video_packet.pos = avio_tell(pb); | |
152 | ||
153 | ret = avio_read(pb, yop->video_packet.data, yop->palette_size); | |
154 | if (ret < 0) { | |
155 | goto err_out; | |
156 | }else if (ret < yop->palette_size) { | |
157 | ret = AVERROR_EOF; | |
158 | goto err_out; | |
159 | } | |
160 | ||
161 | ret = av_get_packet(pb, pkt, 920); | |
162 | if (ret < 0) | |
163 | goto err_out; | |
164 | ||
165 | // Set position to the start of the frame | |
166 | pkt->pos = yop->video_packet.pos; | |
167 | ||
168 | avio_skip(pb, yop->audio_block_length - ret); | |
169 | ||
170 | ret = avio_read(pb, yop->video_packet.data + yop->palette_size, | |
171 | actual_video_data_size); | |
172 | if (ret < 0) | |
173 | goto err_out; | |
174 | else if (ret < actual_video_data_size) | |
175 | av_shrink_packet(&yop->video_packet, yop->palette_size + ret); | |
176 | ||
177 | // Arbitrarily return the audio data first | |
178 | return yop->audio_block_length; | |
179 | ||
180 | err_out: | |
181 | av_free_packet(&yop->video_packet); | |
182 | return ret; | |
183 | } | |
184 | ||
185 | static int yop_read_close(AVFormatContext *s) | |
186 | { | |
187 | YopDecContext *yop = s->priv_data; | |
188 | av_free_packet(&yop->video_packet); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static int yop_read_seek(AVFormatContext *s, int stream_index, | |
193 | int64_t timestamp, int flags) | |
194 | { | |
195 | YopDecContext *yop = s->priv_data; | |
196 | int64_t frame_pos, pos_min, pos_max; | |
197 | int frame_count; | |
198 | ||
199 | if (!stream_index) | |
200 | return -1; | |
201 | ||
202 | pos_min = s->data_offset; | |
203 | pos_max = avio_size(s->pb) - yop->frame_size; | |
204 | frame_count = (pos_max - pos_min) / yop->frame_size; | |
205 | ||
206 | timestamp = FFMAX(0, FFMIN(frame_count, timestamp)); | |
207 | ||
208 | frame_pos = timestamp * yop->frame_size + pos_min; | |
209 | ||
210 | if (avio_seek(s->pb, frame_pos, SEEK_SET) < 0) | |
211 | return -1; | |
212 | ||
213 | av_free_packet(&yop->video_packet); | |
214 | yop->odd_frame = timestamp & 1; | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | AVInputFormat ff_yop_demuxer = { | |
220 | .name = "yop", | |
221 | .long_name = NULL_IF_CONFIG_SMALL("Psygnosis YOP"), | |
222 | .priv_data_size = sizeof(YopDecContext), | |
223 | .read_probe = yop_probe, | |
224 | .read_header = yop_read_header, | |
225 | .read_packet = yop_read_packet, | |
226 | .read_close = yop_read_close, | |
227 | .read_seek = yop_read_seek, | |
228 | .extensions = "yop", | |
229 | .flags = AVFMT_GENERIC_INDEX, | |
230 | }; |