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 St, Fifth Floor, Boston, MA 02110-1301 USA
26 typedef struct avs_format {
27 voc_dec_context_t voc;
35 int remaining_frame_size;
36 int remaining_audio_size;
39 typedef enum avs_block_type {
46 static int avs_probe(AVProbeData * p)
53 if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
59 static int avs_read_header(AVFormatContext * s, AVFormatParameters * ap)
61 avs_format_t *avs = s->priv_data;
63 s->ctx_flags |= AVFMTCTX_NOHEADER;
66 avs->width = get_le16(&s->pb);
67 avs->height = get_le16(&s->pb);
68 avs->bits_per_sample = get_le16(&s->pb);
69 avs->fps = get_le16(&s->pb);
70 avs->nb_frames = get_le32(&s->pb);
71 avs->remaining_frame_size = 0;
72 avs->remaining_audio_size = 0;
74 avs->st_video = avs->st_audio = NULL;
76 if (avs->width != 318 || avs->height != 198)
77 av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
78 "when the avs format is supposed to be 318x198 only.\n",
79 avs->width, avs->height);
85 avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
86 avs_block_type_t type, int sub_type, int size,
87 uint8_t * palette, int palette_size)
89 avs_format_t *avs = s->priv_data;
92 ret = av_new_packet(pkt, size + palette_size);
99 pkt->data[2] = palette_size & 0xFF;
100 pkt->data[3] = (palette_size >> 8) & 0xFF;
101 memcpy(pkt->data + 4, palette, palette_size - 4);
104 pkt->data[palette_size + 0] = sub_type;
105 pkt->data[palette_size + 1] = type;
106 pkt->data[palette_size + 2] = size & 0xFF;
107 pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
108 ret = get_buffer(&s->pb, pkt->data + palette_size + 4, size - 4) + 4;
114 pkt->size = ret + palette_size;
115 pkt->stream_index = avs->st_video->index;
117 pkt->flags |= PKT_FLAG_KEY;
122 static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
124 avs_format_t *avs = s->priv_data;
127 size = url_ftell(&s->pb);
128 ret = voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
129 size = url_ftell(&s->pb) - size;
130 avs->remaining_audio_size -= size;
132 if (ret == AVERROR_IO)
133 return 0; /* this indicate EOS */
137 pkt->stream_index = avs->st_audio->index;
138 pkt->flags |= PKT_FLAG_KEY;
143 static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
145 avs_format_t *avs = s->priv_data;
146 int sub_type = 0, size = 0;
147 avs_block_type_t type = 0;
148 int palette_size = 0;
149 uint8_t palette[4 + 3 * 256];
152 if (avs->remaining_audio_size > 0)
153 if (avs_read_audio_packet(s, pkt) > 0)
157 if (avs->remaining_frame_size <= 0) {
158 if (!get_le16(&s->pb)) /* found EOF */
160 avs->remaining_frame_size = get_le16(&s->pb) - 4;
163 while (avs->remaining_frame_size > 0) {
164 sub_type = get_byte(&s->pb);
165 type = get_byte(&s->pb);
166 size = get_le16(&s->pb);
167 avs->remaining_frame_size -= size;
171 ret = get_buffer(&s->pb, palette, size - 4);
178 if (!avs->st_video) {
179 avs->st_video = av_new_stream(s, AVS_VIDEO);
180 if (avs->st_video == NULL)
181 return AVERROR_NOMEM;
182 avs->st_video->codec->codec_type = CODEC_TYPE_VIDEO;
183 avs->st_video->codec->codec_id = CODEC_ID_AVS;
184 avs->st_video->codec->width = avs->width;
185 avs->st_video->codec->height = avs->height;
186 avs->st_video->codec->bits_per_sample=avs->bits_per_sample;
187 avs->st_video->nb_frames = avs->nb_frames;
188 avs->st_video->codec->time_base = (AVRational) {
191 return avs_read_video_packet(s, pkt, type, sub_type, size,
192 palette, palette_size);
195 if (!avs->st_audio) {
196 avs->st_audio = av_new_stream(s, AVS_AUDIO);
197 if (avs->st_audio == NULL)
198 return AVERROR_NOMEM;
199 avs->st_audio->codec->codec_type = CODEC_TYPE_AUDIO;
201 avs->remaining_audio_size = size - 4;
202 size = avs_read_audio_packet(s, pkt);
208 url_fskip(&s->pb, size - 4);
214 static int avs_read_close(AVFormatContext * s)
219 AVInputFormat avs_demuxer = {
222 sizeof(avs_format_t),