blob: b2c067fb998381633b55b88d9d30bce8f36470bc
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 JVFrame { |
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 JVDemuxContext { |
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) + 4 <= pd->buf_size && |
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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
89 | vst->codecpar->codec_id = AV_CODEC_ID_JV; |
90 | vst->codecpar->codec_tag = 0; /* no fourcc */ |
91 | vst->codecpar->width = avio_rl16(pb); |
92 | vst->codecpar->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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
101 | ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8; |
102 | ast->codecpar->codec_tag = 0; /* no fourcc */ |
103 | ast->codecpar->sample_rate = avio_rl16(pb); |
104 | ast->codecpar->channels = 1; |
105 | ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
106 | avpriv_set_pts_info(ast, 64, 1, ast->codecpar->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 | AV_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 | }; |
264 |