1/*
2 * AVS demuxer.
3 * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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
26typedef 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
39typedef 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
47static 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
58static int avs_read_header(AVFormatContext * s, AVFormatParameters * ap)
59{
60    AvsFormat *avs = s->priv_data;
61
62    s->ctx_flags |= AVFMTCTX_NOHEADER;
63
64    avio_skip(s->pb, 4);
65    avs->width = avio_rl16(s->pb);
66    avs->height = avio_rl16(s->pb);
67    avs->bits_per_sample = avio_rl16(s->pb);
68    avs->fps = avio_rl16(s->pb);
69    avs->nb_frames = avio_rl32(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
83static int
84avs_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 = avio_read(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 |= AV_PKT_FLAG_KEY;
117
118    return 0;
119}
120
121static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
122{
123    AvsFormat *avs = s->priv_data;
124    int ret, size;
125
126    size = avio_tell(s->pb);
127    ret = voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
128    size = avio_tell(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 |= AV_PKT_FLAG_KEY;
138
139    return size;
140}
141
142static 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 (!avio_rl16(s->pb))    /* found EOF */
158                return AVERROR(EIO);
159            avs->remaining_frame_size = avio_rl16(s->pb) - 4;
160        }
161
162        while (avs->remaining_frame_size > 0) {
163            sub_type = avio_r8(s->pb);
164            type = avio_r8(s->pb);
165            size = avio_rl16(s->pb);
166            if (size < 4)
167                return AVERROR_INVALIDDATA;
168            avs->remaining_frame_size -= size;
169
170            switch (type) {
171            case AVS_PALETTE:
172                if (size - 4 > sizeof(palette))
173                    return AVERROR_INVALIDDATA;
174                ret = avio_read(s->pb, palette, size - 4);
175                if (ret < size - 4)
176                    return AVERROR(EIO);
177                palette_size = size;
178                break;
179
180            case AVS_VIDEO:
181                if (!avs->st_video) {
182                    avs->st_video = avformat_new_stream(s, NULL);
183                    if (avs->st_video == NULL)
184                        return AVERROR(ENOMEM);
185                    avs->st_video->codec->codec_type = AVMEDIA_TYPE_VIDEO;
186                    avs->st_video->codec->codec_id = CODEC_ID_AVS;
187                    avs->st_video->codec->width = avs->width;
188                    avs->st_video->codec->height = avs->height;
189                    avs->st_video->codec->bits_per_coded_sample=avs->bits_per_sample;
190                    avs->st_video->nb_frames = avs->nb_frames;
191                    avs->st_video->codec->time_base = (AVRational) {
192                    1, avs->fps};
193                }
194                return avs_read_video_packet(s, pkt, type, sub_type, size,
195                                             palette, palette_size);
196
197            case AVS_AUDIO:
198                if (!avs->st_audio) {
199                    avs->st_audio = avformat_new_stream(s, NULL);
200                    if (avs->st_audio == NULL)
201                        return AVERROR(ENOMEM);
202                    avs->st_audio->codec->codec_type = AVMEDIA_TYPE_AUDIO;
203                }
204                avs->remaining_audio_size = size - 4;
205                size = avs_read_audio_packet(s, pkt);
206                if (size != 0)
207                    return size;
208                break;
209
210            default:
211                avio_skip(s->pb, size - 4);
212            }
213        }
214    }
215}
216
217static int avs_read_close(AVFormatContext * s)
218{
219    return 0;
220}
221
222AVInputFormat ff_avs_demuxer = {
223    .name           = "avs",
224    .long_name      = NULL_IF_CONFIG_SMALL("AVS format"),
225    .priv_data_size = sizeof(AvsFormat),
226    .read_probe     = avs_probe,
227    .read_header    = avs_read_header,
228    .read_packet    = avs_read_packet,
229    .read_close     = avs_read_close,
230};
231