3 * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 typedef struct avs_format {
25 voc_dec_context_t voc;
33 int remaining_frame_size;
34 int remaining_audio_size;
37 typedef enum avs_block_type {
45 #ifdef CONFIG_DEMUXERS
47 static int avs_probe(AVProbeData * p)
54 if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
60 static int avs_read_header(AVFormatContext * s, AVFormatParameters * ap)
62 avs_format_t *avs = s->priv_data;
64 s->ctx_flags |= AVFMTCTX_NOHEADER;
67 avs->width = get_le16(&s->pb);
68 avs->height = get_le16(&s->pb);
69 avs->bits_per_sample = get_le16(&s->pb);
70 avs->fps = get_le16(&s->pb);
71 avs->nb_frames = get_le32(&s->pb);
72 avs->remaining_frame_size = 0;
73 avs->remaining_audio_size = 0;
75 avs->st_video = avs->st_audio = NULL;
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);
86 avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
87 avs_block_type_t type, int sub_type, int size,
88 uint8_t * palette, int palette_size)
90 avs_format_t *avs = s->priv_data;
93 ret = av_new_packet(pkt, size + palette_size);
100 pkt->data[2] = palette_size & 0xFF;
101 pkt->data[3] = (palette_size >> 8) & 0xFF;
102 memcpy(pkt->data + 4, palette, palette_size - 4);
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 = get_buffer(&s->pb, pkt->data + palette_size + 4, size - 4) + 4;
115 pkt->size = ret + palette_size;
116 pkt->stream_index = avs->st_video->index;
118 pkt->flags |= PKT_FLAG_KEY;
123 static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
125 avs_format_t *avs = s->priv_data;
128 size = url_ftell(&s->pb);
129 ret = voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
130 size = url_ftell(&s->pb) - size;
131 avs->remaining_audio_size -= size;
133 if (ret == AVERROR_IO)
134 return 0; /* this indicate EOS */
138 pkt->stream_index = avs->st_audio->index;
139 pkt->flags |= PKT_FLAG_KEY;
144 static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
146 avs_format_t *avs = s->priv_data;
147 int sub_type = 0, size = 0;
148 avs_block_type_t type = 0;
149 int palette_size = 0;
150 uint8_t palette[4 + 3 * 256];
153 if (avs->remaining_audio_size > 0)
154 if (avs_read_audio_packet(s, pkt) > 0)
158 if (avs->remaining_frame_size <= 0) {
159 if (!get_le16(&s->pb)) /* found EOF */
161 avs->remaining_frame_size = get_le16(&s->pb) - 4;
164 while (avs->remaining_frame_size > 0) {
165 sub_type = get_byte(&s->pb);
166 type = get_byte(&s->pb);
167 size = get_le16(&s->pb);
168 avs->remaining_frame_size -= size;
172 ret = get_buffer(&s->pb, palette, size - 4);
179 if (!avs->st_video) {
180 avs->st_video = av_new_stream(s, AVS_VIDEO);
181 if (avs->st_video == NULL)
182 return AVERROR_NOMEM;
183 avs->st_video->codec->codec_type = CODEC_TYPE_VIDEO;
184 avs->st_video->codec->codec_id = CODEC_ID_AVS;
185 avs->st_video->codec->width = avs->width;
186 avs->st_video->codec->height = avs->height;
187 avs->st_video->codec->bits_per_sample=avs->bits_per_sample;
188 avs->st_video->nb_frames = avs->nb_frames;
189 avs->st_video->codec->time_base = (AVRational) {
192 return avs_read_video_packet(s, pkt, type, sub_type, size,
193 palette, palette_size);
196 if (!avs->st_audio) {
197 avs->st_audio = av_new_stream(s, AVS_AUDIO);
198 if (avs->st_audio == NULL)
199 return AVERROR_NOMEM;
200 avs->st_audio->codec->codec_type = CODEC_TYPE_AUDIO;
202 avs->remaining_audio_size = size - 4;
203 size = avs_read_audio_packet(s, pkt);
209 url_fskip(&s->pb, size - 4);
215 static int avs_read_close(AVFormatContext * s)
220 static AVInputFormat avs_iformat = {
223 sizeof(avs_format_t),
230 #endif /* CONFIG_DEMUXERS */
234 #ifdef CONFIG_DEMUXERS
235 av_register_input_format(&avs_iformat);
236 #endif /* CONFIG_DEMUXERS */