3 * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
5 * This file is part of FFmpeg.
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.
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.
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
24 * Argonaut Games' Creature Shock demuxer
25 * @see http://wiki.multimedia.cx/index.php?title=AVS
32 typedef struct avs_format {
41 int remaining_frame_size;
42 int remaining_audio_size;
45 typedef enum avs_block_type {
53 static int avs_probe(const AVProbeData * p)
58 if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
59 /* Ensure the buffer probe scores higher than the extension probe.
60 * This avoids problems with misdetection as AviSynth scripts. */
61 return AVPROBE_SCORE_EXTENSION + 5;
66 static int avs_read_header(AVFormatContext * s)
68 AvsFormat *avs = s->priv_data;
70 s->ctx_flags |= AVFMTCTX_NOHEADER;
73 avs->width = avio_rl16(s->pb);
74 avs->height = avio_rl16(s->pb);
75 avs->bits_per_sample = avio_rl16(s->pb);
76 avs->fps = avio_rl16(s->pb);
77 avs->nb_frames = avio_rl32(s->pb);
78 avs->remaining_frame_size = 0;
79 avs->remaining_audio_size = 0;
81 avs->st_video = avs->st_audio = NULL;
83 if (avs->width != 318 || avs->height != 198)
84 av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
85 "when the avs format is supposed to be 318x198 only.\n",
86 avs->width, avs->height);
92 avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
93 AvsBlockType type, int sub_type, int size,
94 uint8_t * palette, int palette_size)
96 AvsFormat *avs = s->priv_data;
99 ret = av_new_packet(pkt, size + palette_size);
106 pkt->data[2] = palette_size & 0xFF;
107 pkt->data[3] = (palette_size >> 8) & 0xFF;
108 memcpy(pkt->data + 4, palette, palette_size - 4);
111 pkt->data[palette_size + 0] = sub_type;
112 pkt->data[palette_size + 1] = type;
113 pkt->data[palette_size + 2] = size & 0xFF;
114 pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
115 ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
120 pkt->size = ret + palette_size;
121 pkt->stream_index = avs->st_video->index;
123 pkt->flags |= AV_PKT_FLAG_KEY;
128 static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
130 AvsFormat *avs = s->priv_data;
133 size = avio_tell(s->pb);
134 ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
135 size = avio_tell(s->pb) - size;
136 avs->remaining_audio_size -= size;
138 if (ret == AVERROR(EIO))
139 return 0; /* this indicate EOS */
143 pkt->stream_index = avs->st_audio->index;
144 pkt->flags |= AV_PKT_FLAG_KEY;
149 static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
151 AvsFormat *avs = s->priv_data;
152 int sub_type = 0, size = 0;
153 AvsBlockType type = AVS_NONE;
154 int palette_size = 0;
155 uint8_t palette[4 + 3 * 256];
158 if (avs->remaining_audio_size > 0)
159 if (avs_read_audio_packet(s, pkt) > 0)
163 if (avs->remaining_frame_size <= 0) {
164 if (!avio_rl16(s->pb)) /* found EOF */
166 avs->remaining_frame_size = avio_rl16(s->pb) - 4;
169 while (avs->remaining_frame_size > 0) {
170 sub_type = avio_r8(s->pb);
171 type = avio_r8(s->pb);
172 size = avio_rl16(s->pb);
174 return AVERROR_INVALIDDATA;
175 avs->remaining_frame_size -= size;
179 if (size - 4 > sizeof(palette))
180 return AVERROR_INVALIDDATA;
181 ret = avio_read(s->pb, palette, size - 4);
188 if (!avs->st_video) {
189 avs->st_video = avformat_new_stream(s, NULL);
191 return AVERROR(ENOMEM);
192 avs->st_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
193 avs->st_video->codecpar->codec_id = AV_CODEC_ID_AVS;
194 avs->st_video->codecpar->width = avs->width;
195 avs->st_video->codecpar->height = avs->height;
196 avs->st_video->codecpar->bits_per_coded_sample=avs->bits_per_sample;
197 avs->st_video->nb_frames = avs->nb_frames;
198 #if FF_API_R_FRAME_RATE
199 avs->st_video->r_frame_rate =
201 avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};
203 return avs_read_video_packet(s, pkt, type, sub_type, size,
204 palette, palette_size);
207 if (!avs->st_audio) {
208 avs->st_audio = avformat_new_stream(s, NULL);
210 return AVERROR(ENOMEM);
211 avs->st_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
213 avs->remaining_audio_size = size - 4;
214 size = avs_read_audio_packet(s, pkt);
220 avio_skip(s->pb, size - 4);
226 AVInputFormat ff_avs_demuxer = {
228 .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games Creature Shock"),
229 .priv_data_size = sizeof(AvsFormat),
230 .read_probe = avs_probe,
231 .read_header = avs_read_header,
232 .read_packet = avs_read_packet,