avoid POSIX reserved _t suffix
[libav.git] / libavformat / avs.c
1 /*
2 * AVS demuxer.
3 * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.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 #include "avformat.h"
23 #include "voc.h"
24
25
26 typedef struct avs_format {
27 VocDecContext voc;
28 AVStream *st_video;
29 AVStream *st_audio;
30 int width;
31 int height;
32 int bits_per_sample;
33 int fps;
34 int nb_frames;
35 int remaining_frame_size;
36 int remaining_audio_size;
37 } AvsFormat;
38
39 typedef enum avs_block_type {
40 AVS_NONE = 0x00,
41 AVS_VIDEO = 0x01,
42 AVS_AUDIO = 0x02,
43 AVS_PALETTE = 0x03,
44 AVS_GAME_DATA = 0x04,
45 } AvsBlockType;
46
47 static int avs_probe(AVProbeData * p)
48 {
49 const uint8_t *d;
50
51 d = p->buf;
52 if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
53 return 50;
54
55 return 0;
56 }
57
58 static int avs_read_header(AVFormatContext * s, AVFormatParameters * ap)
59 {
60 AvsFormat *avs = s->priv_data;
61
62 s->ctx_flags |= AVFMTCTX_NOHEADER;
63
64 url_fskip(s->pb, 4);
65 avs->width = get_le16(s->pb);
66 avs->height = get_le16(s->pb);
67 avs->bits_per_sample = get_le16(s->pb);
68 avs->fps = get_le16(s->pb);
69 avs->nb_frames = get_le32(s->pb);
70 avs->remaining_frame_size = 0;
71 avs->remaining_audio_size = 0;
72
73 avs->st_video = avs->st_audio = NULL;
74
75 if (avs->width != 318 || avs->height != 198)
76 av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
77 "when the avs format is supposed to be 318x198 only.\n",
78 avs->width, avs->height);
79
80 return 0;
81 }
82
83 static int
84 avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
85 AvsBlockType type, int sub_type, int size,
86 uint8_t * palette, int palette_size)
87 {
88 AvsFormat *avs = s->priv_data;
89 int ret;
90
91 ret = av_new_packet(pkt, size + palette_size);
92 if (ret < 0)
93 return ret;
94
95 if (palette_size) {
96 pkt->data[0] = 0x00;
97 pkt->data[1] = 0x03;
98 pkt->data[2] = palette_size & 0xFF;
99 pkt->data[3] = (palette_size >> 8) & 0xFF;
100 memcpy(pkt->data + 4, palette, palette_size - 4);
101 }
102
103 pkt->data[palette_size + 0] = sub_type;
104 pkt->data[palette_size + 1] = type;
105 pkt->data[palette_size + 2] = size & 0xFF;
106 pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
107 ret = get_buffer(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
108 if (ret < size) {
109 av_free_packet(pkt);
110 return AVERROR(EIO);
111 }
112
113 pkt->size = ret + palette_size;
114 pkt->stream_index = avs->st_video->index;
115 if (sub_type == 0)
116 pkt->flags |= PKT_FLAG_KEY;
117
118 return 0;
119 }
120
121 static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
122 {
123 AvsFormat *avs = s->priv_data;
124 int ret, size;
125
126 size = url_ftell(s->pb);
127 ret = voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
128 size = url_ftell(s->pb) - size;
129 avs->remaining_audio_size -= size;
130
131 if (ret == AVERROR(EIO))
132 return 0; /* this indicate EOS */
133 if (ret < 0)
134 return ret;
135
136 pkt->stream_index = avs->st_audio->index;
137 pkt->flags |= PKT_FLAG_KEY;
138
139 return size;
140 }
141
142 static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
143 {
144 AvsFormat *avs = s->priv_data;
145 int sub_type = 0, size = 0;
146 AvsBlockType type = AVS_NONE;
147 int palette_size = 0;
148 uint8_t palette[4 + 3 * 256];
149 int ret;
150
151 if (avs->remaining_audio_size > 0)
152 if (avs_read_audio_packet(s, pkt) > 0)
153 return 0;
154
155 while (1) {
156 if (avs->remaining_frame_size <= 0) {
157 if (!get_le16(s->pb)) /* found EOF */
158 return AVERROR(EIO);
159 avs->remaining_frame_size = get_le16(s->pb) - 4;
160 }
161
162 while (avs->remaining_frame_size > 0) {
163 sub_type = get_byte(s->pb);
164 type = get_byte(s->pb);
165 size = get_le16(s->pb);
166 avs->remaining_frame_size -= size;
167
168 switch (type) {
169 case AVS_PALETTE:
170 ret = get_buffer(s->pb, palette, size - 4);
171 if (ret < size - 4)
172 return AVERROR(EIO);
173 palette_size = size;
174 break;
175
176 case AVS_VIDEO:
177 if (!avs->st_video) {
178 avs->st_video = av_new_stream(s, AVS_VIDEO);
179 if (avs->st_video == NULL)
180 return AVERROR(ENOMEM);
181 avs->st_video->codec->codec_type = CODEC_TYPE_VIDEO;
182 avs->st_video->codec->codec_id = CODEC_ID_AVS;
183 avs->st_video->codec->width = avs->width;
184 avs->st_video->codec->height = avs->height;
185 avs->st_video->codec->bits_per_coded_sample=avs->bits_per_sample;
186 avs->st_video->nb_frames = avs->nb_frames;
187 avs->st_video->codec->time_base = (AVRational) {
188 1, avs->fps};
189 }
190 return avs_read_video_packet(s, pkt, type, sub_type, size,
191 palette, palette_size);
192
193 case AVS_AUDIO:
194 if (!avs->st_audio) {
195 avs->st_audio = av_new_stream(s, AVS_AUDIO);
196 if (avs->st_audio == NULL)
197 return AVERROR(ENOMEM);
198 avs->st_audio->codec->codec_type = CODEC_TYPE_AUDIO;
199 }
200 avs->remaining_audio_size = size - 4;
201 size = avs_read_audio_packet(s, pkt);
202 if (size != 0)
203 return size;
204 break;
205
206 default:
207 url_fskip(s->pb, size - 4);
208 }
209 }
210 }
211 }
212
213 static int avs_read_close(AVFormatContext * s)
214 {
215 return 0;
216 }
217
218 AVInputFormat avs_demuxer = {
219 "avs",
220 NULL_IF_CONFIG_SMALL("AVS format"),
221 sizeof(AvsFormat),
222 avs_probe,
223 avs_read_header,
224 avs_read_packet,
225 avs_read_close,
226 };