blob: 763ba63f64fb36b2a983fc4ce74f533a9d244bea
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 | /* Ensure the buffer probe scores higher than the extension probe. |
54 | * This avoids problems with misdetection as AviSynth scripts. */ |
55 | return AVPROBE_SCORE_EXTENSION + 5; |
56 | |
57 | return 0; |
58 | } |
59 | |
60 | static int avs_read_header(AVFormatContext * s) |
61 | { |
62 | AvsFormat *avs = s->priv_data; |
63 | |
64 | s->ctx_flags |= AVFMTCTX_NOHEADER; |
65 | |
66 | avio_skip(s->pb, 4); |
67 | avs->width = avio_rl16(s->pb); |
68 | avs->height = avio_rl16(s->pb); |
69 | avs->bits_per_sample = avio_rl16(s->pb); |
70 | avs->fps = avio_rl16(s->pb); |
71 | avs->nb_frames = avio_rl32(s->pb); |
72 | avs->remaining_frame_size = 0; |
73 | avs->remaining_audio_size = 0; |
74 | |
75 | avs->st_video = avs->st_audio = NULL; |
76 | |
77 | if (avs->width != 318 || avs->height != 198) |
78 | av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d " |
79 | "when the avs format is supposed to be 318x198 only.\n", |
80 | avs->width, avs->height); |
81 | |
82 | return 0; |
83 | } |
84 | |
85 | static int |
86 | avs_read_video_packet(AVFormatContext * s, AVPacket * pkt, |
87 | AvsBlockType type, int sub_type, int size, |
88 | uint8_t * palette, int palette_size) |
89 | { |
90 | AvsFormat *avs = s->priv_data; |
91 | int ret; |
92 | |
93 | ret = av_new_packet(pkt, size + palette_size); |
94 | if (ret < 0) |
95 | return ret; |
96 | |
97 | if (palette_size) { |
98 | pkt->data[0] = 0x00; |
99 | pkt->data[1] = 0x03; |
100 | pkt->data[2] = palette_size & 0xFF; |
101 | pkt->data[3] = (palette_size >> 8) & 0xFF; |
102 | memcpy(pkt->data + 4, palette, palette_size - 4); |
103 | } |
104 | |
105 | pkt->data[palette_size + 0] = sub_type; |
106 | pkt->data[palette_size + 1] = type; |
107 | pkt->data[palette_size + 2] = size & 0xFF; |
108 | pkt->data[palette_size + 3] = (size >> 8) & 0xFF; |
109 | ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4; |
110 | if (ret < size) { |
111 | av_packet_unref(pkt); |
112 | return AVERROR(EIO); |
113 | } |
114 | |
115 | pkt->size = ret + palette_size; |
116 | pkt->stream_index = avs->st_video->index; |
117 | if (sub_type == 0) |
118 | pkt->flags |= AV_PKT_FLAG_KEY; |
119 | |
120 | return 0; |
121 | } |
122 | |
123 | static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt) |
124 | { |
125 | AvsFormat *avs = s->priv_data; |
126 | int ret, size; |
127 | |
128 | size = avio_tell(s->pb); |
129 | ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size); |
130 | size = avio_tell(s->pb) - size; |
131 | avs->remaining_audio_size -= size; |
132 | |
133 | if (ret == AVERROR(EIO)) |
134 | return 0; /* this indicate EOS */ |
135 | if (ret < 0) |
136 | return ret; |
137 | |
138 | pkt->stream_index = avs->st_audio->index; |
139 | pkt->flags |= AV_PKT_FLAG_KEY; |
140 | |
141 | return size; |
142 | } |
143 | |
144 | static int avs_read_packet(AVFormatContext * s, AVPacket * pkt) |
145 | { |
146 | AvsFormat *avs = s->priv_data; |
147 | int sub_type = 0, size = 0; |
148 | AvsBlockType type = AVS_NONE; |
149 | int palette_size = 0; |
150 | uint8_t palette[4 + 3 * 256]; |
151 | int ret; |
152 | |
153 | if (avs->remaining_audio_size > 0) |
154 | if (avs_read_audio_packet(s, pkt) > 0) |
155 | return 0; |
156 | |
157 | while (1) { |
158 | if (avs->remaining_frame_size <= 0) { |
159 | if (!avio_rl16(s->pb)) /* found EOF */ |
160 | return AVERROR(EIO); |
161 | avs->remaining_frame_size = avio_rl16(s->pb) - 4; |
162 | } |
163 | |
164 | while (avs->remaining_frame_size > 0) { |
165 | sub_type = avio_r8(s->pb); |
166 | type = avio_r8(s->pb); |
167 | size = avio_rl16(s->pb); |
168 | if (size < 4) |
169 | return AVERROR_INVALIDDATA; |
170 | avs->remaining_frame_size -= size; |
171 | |
172 | switch (type) { |
173 | case AVS_PALETTE: |
174 | if (size - 4 > sizeof(palette)) |
175 | return AVERROR_INVALIDDATA; |
176 | ret = avio_read(s->pb, palette, size - 4); |
177 | if (ret < size - 4) |
178 | return AVERROR(EIO); |
179 | palette_size = size; |
180 | break; |
181 | |
182 | case AVS_VIDEO: |
183 | if (!avs->st_video) { |
184 | avs->st_video = avformat_new_stream(s, NULL); |
185 | if (!avs->st_video) |
186 | return AVERROR(ENOMEM); |
187 | avs->st_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
188 | avs->st_video->codecpar->codec_id = AV_CODEC_ID_AVS; |
189 | avs->st_video->codecpar->width = avs->width; |
190 | avs->st_video->codecpar->height = avs->height; |
191 | avs->st_video->codecpar->bits_per_coded_sample=avs->bits_per_sample; |
192 | avs->st_video->nb_frames = avs->nb_frames; |
193 | #if FF_API_R_FRAME_RATE |
194 | avs->st_video->r_frame_rate = |
195 | #endif |
196 | avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1}; |
197 | } |
198 | return avs_read_video_packet(s, pkt, type, sub_type, size, |
199 | palette, palette_size); |
200 | |
201 | case AVS_AUDIO: |
202 | if (!avs->st_audio) { |
203 | avs->st_audio = avformat_new_stream(s, NULL); |
204 | if (!avs->st_audio) |
205 | return AVERROR(ENOMEM); |
206 | avs->st_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
207 | } |
208 | avs->remaining_audio_size = size - 4; |
209 | size = avs_read_audio_packet(s, pkt); |
210 | if (size != 0) |
211 | return size; |
212 | break; |
213 | |
214 | default: |
215 | avio_skip(s->pb, size - 4); |
216 | } |
217 | } |
218 | } |
219 | } |
220 | |
221 | static int avs_read_close(AVFormatContext * s) |
222 | { |
223 | return 0; |
224 | } |
225 | |
226 | AVInputFormat ff_avs_demuxer = { |
227 | .name = "avs", |
228 | .long_name = NULL_IF_CONFIG_SMALL("AVS"), |
229 | .priv_data_size = sizeof(AvsFormat), |
230 | .read_probe = avs_probe, |
231 | .read_header = avs_read_header, |
232 | .read_packet = avs_read_packet, |
233 | .read_close = avs_read_close, |
234 | }; |
235 |