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2ba45a60 DM |
1 | /* |
2 | * Bitmap Brothers JV demuxer | |
3 | * Copyright (c) 2005, 2011 Peter Ross <pross@xvid.org> | |
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 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * Bitmap Brothers JV demuxer | |
25 | * @author Peter Ross <pross@xvid.org> | |
26 | */ | |
27 | ||
28 | #include "libavutil/channel_layout.h" | |
29 | #include "libavutil/intreadwrite.h" | |
30 | ||
31 | #include "avformat.h" | |
32 | #include "internal.h" | |
33 | ||
34 | #define JV_PREAMBLE_SIZE 5 | |
35 | ||
36 | typedef struct { | |
37 | int audio_size; /**< audio packet size (bytes) */ | |
38 | int video_size; /**< video packet size (bytes) */ | |
39 | int palette_size; /**< palette size (bytes) */ | |
40 | int video_type; /**< per-frame video compression type */ | |
41 | } JVFrame; | |
42 | ||
43 | typedef struct { | |
44 | JVFrame *frames; | |
45 | enum { | |
46 | JV_AUDIO = 0, | |
47 | JV_VIDEO, | |
48 | JV_PADDING | |
49 | } state; | |
50 | int64_t pts; | |
51 | } JVDemuxContext; | |
52 | ||
53 | #define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd." | |
54 | ||
55 | static int read_probe(AVProbeData *pd) | |
56 | { | |
57 | if (pd->buf[0] == 'J' && pd->buf[1] == 'V' && strlen(MAGIC) <= pd->buf_size - 4 && | |
58 | !memcmp(pd->buf + 4, MAGIC, strlen(MAGIC))) | |
59 | return AVPROBE_SCORE_MAX; | |
60 | return 0; | |
61 | } | |
62 | ||
63 | static int read_close(AVFormatContext *s) | |
64 | { | |
65 | JVDemuxContext *jv = s->priv_data; | |
66 | ||
67 | av_freep(&jv->frames); | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static int read_header(AVFormatContext *s) | |
73 | { | |
74 | JVDemuxContext *jv = s->priv_data; | |
75 | AVIOContext *pb = s->pb; | |
76 | AVStream *vst, *ast; | |
77 | int64_t audio_pts = 0; | |
78 | int64_t offset; | |
79 | int i; | |
80 | ||
81 | avio_skip(pb, 80); | |
82 | ||
83 | ast = avformat_new_stream(s, NULL); | |
84 | vst = avformat_new_stream(s, NULL); | |
85 | if (!ast || !vst) | |
86 | return AVERROR(ENOMEM); | |
87 | ||
88 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
89 | vst->codec->codec_id = AV_CODEC_ID_JV; | |
90 | vst->codec->codec_tag = 0; /* no fourcc */ | |
91 | vst->codec->width = avio_rl16(pb); | |
92 | vst->codec->height = avio_rl16(pb); | |
93 | vst->duration = | |
94 | vst->nb_frames = | |
95 | ast->nb_index_entries = avio_rl16(pb); | |
96 | avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000); | |
97 | ||
98 | avio_skip(pb, 4); | |
99 | ||
100 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
101 | ast->codec->codec_id = AV_CODEC_ID_PCM_U8; | |
102 | ast->codec->codec_tag = 0; /* no fourcc */ | |
103 | ast->codec->sample_rate = avio_rl16(pb); | |
104 | ast->codec->channels = 1; | |
105 | ast->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
106 | avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); | |
107 | ||
108 | avio_skip(pb, 10); | |
109 | ||
110 | ast->index_entries = av_malloc(ast->nb_index_entries * | |
111 | sizeof(*ast->index_entries)); | |
112 | if (!ast->index_entries) | |
113 | return AVERROR(ENOMEM); | |
114 | ||
115 | jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame)); | |
116 | if (!jv->frames) | |
117 | return AVERROR(ENOMEM); | |
118 | ||
119 | offset = 0x68 + ast->nb_index_entries * 16; | |
120 | for (i = 0; i < ast->nb_index_entries; i++) { | |
121 | AVIndexEntry *e = ast->index_entries + i; | |
122 | JVFrame *jvf = jv->frames + i; | |
123 | ||
124 | /* total frame size including audio, video, palette data and padding */ | |
125 | e->size = avio_rl32(pb); | |
126 | e->timestamp = i; | |
127 | e->pos = offset; | |
128 | offset += e->size; | |
129 | ||
130 | jvf->audio_size = avio_rl32(pb); | |
131 | jvf->video_size = avio_rl32(pb); | |
132 | jvf->palette_size = avio_r8(pb) ? 768 : 0; | |
133 | ||
134 | if ((jvf->video_size | jvf->audio_size) & ~0xFFFFFF || | |
135 | e->size - jvf->audio_size | |
136 | - jvf->video_size | |
137 | - jvf->palette_size < 0) { | |
138 | if (s->error_recognition & AV_EF_EXPLODE) { | |
139 | read_close(s); | |
140 | return AVERROR_INVALIDDATA; | |
141 | } | |
142 | jvf->audio_size = | |
143 | jvf->video_size = | |
144 | jvf->palette_size = 0; | |
145 | } | |
146 | ||
147 | if (avio_r8(pb)) | |
148 | av_log(s, AV_LOG_WARNING, "unsupported audio codec\n"); | |
149 | ||
150 | jvf->video_type = avio_r8(pb); | |
151 | avio_skip(pb, 1); | |
152 | ||
153 | e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE; | |
154 | audio_pts += jvf->audio_size; | |
155 | ||
156 | e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0; | |
157 | } | |
158 | ||
159 | jv->state = JV_AUDIO; | |
160 | return 0; | |
161 | } | |
162 | ||
163 | static int read_packet(AVFormatContext *s, AVPacket *pkt) | |
164 | { | |
165 | JVDemuxContext *jv = s->priv_data; | |
166 | AVIOContext *pb = s->pb; | |
167 | AVStream *ast = s->streams[0]; | |
168 | ||
169 | while (!avio_feof(s->pb) && jv->pts < ast->nb_index_entries) { | |
170 | const AVIndexEntry *e = ast->index_entries + jv->pts; | |
171 | const JVFrame *jvf = jv->frames + jv->pts; | |
172 | ||
173 | switch (jv->state) { | |
174 | case JV_AUDIO: | |
175 | jv->state++; | |
176 | if (jvf->audio_size) { | |
177 | if (av_get_packet(s->pb, pkt, jvf->audio_size) < 0) | |
178 | return AVERROR(ENOMEM); | |
179 | pkt->stream_index = 0; | |
180 | pkt->pts = e->timestamp; | |
181 | pkt->flags |= AV_PKT_FLAG_KEY; | |
182 | return 0; | |
183 | } | |
184 | case JV_VIDEO: | |
185 | jv->state++; | |
186 | if (jvf->video_size || jvf->palette_size) { | |
187 | int ret; | |
188 | int size = jvf->video_size + jvf->palette_size; | |
189 | if (av_new_packet(pkt, size + JV_PREAMBLE_SIZE)) | |
190 | return AVERROR(ENOMEM); | |
191 | ||
192 | AV_WL32(pkt->data, jvf->video_size); | |
193 | pkt->data[4] = jvf->video_type; | |
194 | ret = avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size); | |
195 | if (ret < 0) | |
196 | return ret; | |
197 | if (ret < size) { | |
198 | memset(pkt->data + JV_PREAMBLE_SIZE + ret, 0, | |
199 | FF_INPUT_BUFFER_PADDING_SIZE); | |
200 | pkt->flags |= AV_PKT_FLAG_CORRUPT; | |
201 | } | |
202 | pkt->size = ret + JV_PREAMBLE_SIZE; | |
203 | pkt->stream_index = 1; | |
204 | pkt->pts = jv->pts; | |
205 | if (jvf->video_type != 1) | |
206 | pkt->flags |= AV_PKT_FLAG_KEY; | |
207 | return 0; | |
208 | } | |
209 | case JV_PADDING: | |
210 | avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size | |
211 | - jvf->palette_size, 0)); | |
212 | jv->state = JV_AUDIO; | |
213 | jv->pts++; | |
214 | } | |
215 | } | |
216 | ||
217 | if (s->pb->eof_reached) | |
218 | return AVERROR_EOF; | |
219 | ||
220 | return AVERROR(EIO); | |
221 | } | |
222 | ||
223 | static int read_seek(AVFormatContext *s, int stream_index, | |
224 | int64_t ts, int flags) | |
225 | { | |
226 | JVDemuxContext *jv = s->priv_data; | |
227 | AVStream *ast = s->streams[0]; | |
228 | int i; | |
229 | ||
230 | if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME)) | |
231 | return AVERROR(ENOSYS); | |
232 | ||
233 | switch (stream_index) { | |
234 | case 0: | |
235 | i = av_index_search_timestamp(ast, ts, flags); | |
236 | break; | |
237 | case 1: | |
238 | i = ts; | |
239 | break; | |
240 | default: | |
241 | return 0; | |
242 | } | |
243 | ||
244 | if (i < 0 || i >= ast->nb_index_entries) | |
245 | return 0; | |
246 | if (avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET) < 0) | |
247 | return -1; | |
248 | ||
249 | jv->state = JV_AUDIO; | |
250 | jv->pts = i; | |
251 | return 0; | |
252 | } | |
253 | ||
254 | AVInputFormat ff_jv_demuxer = { | |
255 | .name = "jv", | |
256 | .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"), | |
257 | .priv_data_size = sizeof(JVDemuxContext), | |
258 | .read_probe = read_probe, | |
259 | .read_header = read_header, | |
260 | .read_packet = read_packet, | |
261 | .read_seek = read_seek, | |
262 | .read_close = read_close, | |
263 | }; |