| 1 | /* |
| 2 | * AVS demuxer. |
| 3 | * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 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. |
| 11 | * |
| 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. |
| 16 | * |
| 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 |
| 20 | */ |
| 21 | |
| 22 | #include "avformat.h" |
| 23 | #include "voc.h" |
| 24 | |
| 25 | |
| 26 | typedef 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 | |
| 39 | typedef 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 | |
| 47 | static 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 | /* Ensure the buffer probe scores higher than the extension probe. |
| 54 | * This avoids problems with misdetection as AviSynth scripts. */ |
| 55 | return AVPROBE_SCORE_EXTENSION + 5; |
| 56 | |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | static int avs_read_header(AVFormatContext * s) |
| 61 | { |
| 62 | AvsFormat *avs = s->priv_data; |
| 63 | |
| 64 | s->ctx_flags |= AVFMTCTX_NOHEADER; |
| 65 | |
| 66 | avio_skip(s->pb, 4); |
| 67 | avs->width = avio_rl16(s->pb); |
| 68 | avs->height = avio_rl16(s->pb); |
| 69 | avs->bits_per_sample = avio_rl16(s->pb); |
| 70 | avs->fps = avio_rl16(s->pb); |
| 71 | avs->nb_frames = avio_rl32(s->pb); |
| 72 | avs->remaining_frame_size = 0; |
| 73 | avs->remaining_audio_size = 0; |
| 74 | |
| 75 | avs->st_video = avs->st_audio = NULL; |
| 76 | |
| 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); |
| 81 | |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | static int |
| 86 | avs_read_video_packet(AVFormatContext * s, AVPacket * pkt, |
| 87 | AvsBlockType type, int sub_type, int size, |
| 88 | uint8_t * palette, int palette_size) |
| 89 | { |
| 90 | AvsFormat *avs = s->priv_data; |
| 91 | int ret; |
| 92 | |
| 93 | ret = av_new_packet(pkt, size + palette_size); |
| 94 | if (ret < 0) |
| 95 | return ret; |
| 96 | |
| 97 | if (palette_size) { |
| 98 | pkt->data[0] = 0x00; |
| 99 | pkt->data[1] = 0x03; |
| 100 | pkt->data[2] = palette_size & 0xFF; |
| 101 | pkt->data[3] = (palette_size >> 8) & 0xFF; |
| 102 | memcpy(pkt->data + 4, palette, palette_size - 4); |
| 103 | } |
| 104 | |
| 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 = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4; |
| 110 | if (ret < size) { |
| 111 | av_free_packet(pkt); |
| 112 | return AVERROR(EIO); |
| 113 | } |
| 114 | |
| 115 | pkt->size = ret + palette_size; |
| 116 | pkt->stream_index = avs->st_video->index; |
| 117 | if (sub_type == 0) |
| 118 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 119 | |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt) |
| 124 | { |
| 125 | AvsFormat *avs = s->priv_data; |
| 126 | int ret, size; |
| 127 | |
| 128 | size = avio_tell(s->pb); |
| 129 | ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size); |
| 130 | size = avio_tell(s->pb) - size; |
| 131 | avs->remaining_audio_size -= size; |
| 132 | |
| 133 | if (ret == AVERROR(EIO)) |
| 134 | return 0; /* this indicate EOS */ |
| 135 | if (ret < 0) |
| 136 | return ret; |
| 137 | |
| 138 | pkt->stream_index = avs->st_audio->index; |
| 139 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 140 | |
| 141 | return size; |
| 142 | } |
| 143 | |
| 144 | static int avs_read_packet(AVFormatContext * s, AVPacket * pkt) |
| 145 | { |
| 146 | AvsFormat *avs = s->priv_data; |
| 147 | int sub_type = 0, size = 0; |
| 148 | AvsBlockType type = AVS_NONE; |
| 149 | int palette_size = 0; |
| 150 | uint8_t palette[4 + 3 * 256]; |
| 151 | int ret; |
| 152 | |
| 153 | if (avs->remaining_audio_size > 0) |
| 154 | if (avs_read_audio_packet(s, pkt) > 0) |
| 155 | return 0; |
| 156 | |
| 157 | while (1) { |
| 158 | if (avs->remaining_frame_size <= 0) { |
| 159 | if (!avio_rl16(s->pb)) /* found EOF */ |
| 160 | return AVERROR(EIO); |
| 161 | avs->remaining_frame_size = avio_rl16(s->pb) - 4; |
| 162 | } |
| 163 | |
| 164 | while (avs->remaining_frame_size > 0) { |
| 165 | sub_type = avio_r8(s->pb); |
| 166 | type = avio_r8(s->pb); |
| 167 | size = avio_rl16(s->pb); |
| 168 | if (size < 4) |
| 169 | return AVERROR_INVALIDDATA; |
| 170 | avs->remaining_frame_size -= size; |
| 171 | |
| 172 | switch (type) { |
| 173 | case AVS_PALETTE: |
| 174 | if (size - 4 > sizeof(palette)) |
| 175 | return AVERROR_INVALIDDATA; |
| 176 | ret = avio_read(s->pb, palette, size - 4); |
| 177 | if (ret < size - 4) |
| 178 | return AVERROR(EIO); |
| 179 | palette_size = size; |
| 180 | break; |
| 181 | |
| 182 | case AVS_VIDEO: |
| 183 | if (!avs->st_video) { |
| 184 | avs->st_video = avformat_new_stream(s, NULL); |
| 185 | if (!avs->st_video) |
| 186 | return AVERROR(ENOMEM); |
| 187 | avs->st_video->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 188 | avs->st_video->codec->codec_id = AV_CODEC_ID_AVS; |
| 189 | avs->st_video->codec->width = avs->width; |
| 190 | avs->st_video->codec->height = avs->height; |
| 191 | avs->st_video->codec->bits_per_coded_sample=avs->bits_per_sample; |
| 192 | avs->st_video->nb_frames = avs->nb_frames; |
| 193 | #if FF_API_R_FRAME_RATE |
| 194 | avs->st_video->r_frame_rate = |
| 195 | #endif |
| 196 | avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1}; |
| 197 | } |
| 198 | return avs_read_video_packet(s, pkt, type, sub_type, size, |
| 199 | palette, palette_size); |
| 200 | |
| 201 | case AVS_AUDIO: |
| 202 | if (!avs->st_audio) { |
| 203 | avs->st_audio = avformat_new_stream(s, NULL); |
| 204 | if (!avs->st_audio) |
| 205 | return AVERROR(ENOMEM); |
| 206 | avs->st_audio->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 207 | } |
| 208 | avs->remaining_audio_size = size - 4; |
| 209 | size = avs_read_audio_packet(s, pkt); |
| 210 | if (size != 0) |
| 211 | return size; |
| 212 | break; |
| 213 | |
| 214 | default: |
| 215 | avio_skip(s->pb, size - 4); |
| 216 | } |
| 217 | } |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | static int avs_read_close(AVFormatContext * s) |
| 222 | { |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | AVInputFormat ff_avs_demuxer = { |
| 227 | .name = "avs", |
| 228 | .long_name = NULL_IF_CONFIG_SMALL("AVS"), |
| 229 | .priv_data_size = sizeof(AvsFormat), |
| 230 | .read_probe = avs_probe, |
| 231 | .read_header = avs_read_header, |
| 232 | .read_packet = avs_read_packet, |
| 233 | .read_close = avs_read_close, |
| 234 | }; |