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