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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_free_packet(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->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
188 | avs->st_video->codec->codec_id = AV_CODEC_ID_AVS; | |
189 | avs->st_video->codec->width = avs->width; | |
190 | avs->st_video->codec->height = avs->height; | |
191 | avs->st_video->codec->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->codec->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 | }; |