| /* |
| * AVS demuxer. |
| * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Argonaut Games' Creature Shock demuxer |
| * @see http://wiki.multimedia.cx/index.php?title=AVS |
| */ |
| |
| #include "avformat.h" |
| #include "voc.h" |
| |
| |
| typedef struct avs_format { |
| VocDecContext voc; |
| AVStream *st_video; |
| AVStream *st_audio; |
| int width; |
| int height; |
| int bits_per_sample; |
| int fps; |
| int nb_frames; |
| int remaining_frame_size; |
| int remaining_audio_size; |
| } AvsFormat; |
| |
| typedef enum avs_block_type { |
| AVS_NONE = 0x00, |
| AVS_VIDEO = 0x01, |
| AVS_AUDIO = 0x02, |
| AVS_PALETTE = 0x03, |
| AVS_GAME_DATA = 0x04, |
| } AvsBlockType; |
| |
| static int avs_probe(const AVProbeData * p) |
| { |
| const uint8_t *d; |
| |
| d = p->buf; |
| if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0) |
| /* Ensure the buffer probe scores higher than the extension probe. |
| * This avoids problems with misdetection as AviSynth scripts. */ |
| return AVPROBE_SCORE_EXTENSION + 5; |
| |
| return 0; |
| } |
| |
| static int avs_read_header(AVFormatContext * s) |
| { |
| AvsFormat *avs = s->priv_data; |
| |
| s->ctx_flags |= AVFMTCTX_NOHEADER; |
| |
| avio_skip(s->pb, 4); |
| avs->width = avio_rl16(s->pb); |
| avs->height = avio_rl16(s->pb); |
| avs->bits_per_sample = avio_rl16(s->pb); |
| avs->fps = avio_rl16(s->pb); |
| avs->nb_frames = avio_rl32(s->pb); |
| avs->remaining_frame_size = 0; |
| avs->remaining_audio_size = 0; |
| |
| avs->st_video = avs->st_audio = NULL; |
| |
| if (avs->width != 318 || avs->height != 198) |
| av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d " |
| "when the avs format is supposed to be 318x198 only.\n", |
| avs->width, avs->height); |
| |
| return 0; |
| } |
| |
| static int |
| avs_read_video_packet(AVFormatContext * s, AVPacket * pkt, |
| AvsBlockType type, int sub_type, int size, |
| uint8_t * palette, int palette_size) |
| { |
| AvsFormat *avs = s->priv_data; |
| int ret; |
| |
| ret = av_new_packet(pkt, size + palette_size); |
| if (ret < 0) |
| return ret; |
| |
| if (palette_size) { |
| pkt->data[0] = 0x00; |
| pkt->data[1] = 0x03; |
| pkt->data[2] = palette_size & 0xFF; |
| pkt->data[3] = (palette_size >> 8) & 0xFF; |
| memcpy(pkt->data + 4, palette, palette_size - 4); |
| } |
| |
| pkt->data[palette_size + 0] = sub_type; |
| pkt->data[palette_size + 1] = type; |
| pkt->data[palette_size + 2] = size & 0xFF; |
| pkt->data[palette_size + 3] = (size >> 8) & 0xFF; |
| ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4; |
| if (ret < size) { |
| return AVERROR(EIO); |
| } |
| |
| pkt->size = ret + palette_size; |
| pkt->stream_index = avs->st_video->index; |
| if (sub_type == 0) |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| |
| return 0; |
| } |
| |
| static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt) |
| { |
| AvsFormat *avs = s->priv_data; |
| int ret; |
| int64_t size; |
| |
| size = avio_tell(s->pb); |
| ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size); |
| size = avio_tell(s->pb) - size; |
| avs->remaining_audio_size -= size; |
| |
| if (ret == AVERROR(EIO)) |
| return 0; /* this indicate EOS */ |
| if (ret < 0) |
| return ret; |
| |
| pkt->stream_index = avs->st_audio->index; |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| |
| return size; |
| } |
| |
| static int avs_read_packet(AVFormatContext * s, AVPacket * pkt) |
| { |
| AvsFormat *avs = s->priv_data; |
| int sub_type = 0, size = 0; |
| AvsBlockType type = AVS_NONE; |
| int palette_size = 0; |
| uint8_t palette[4 + 3 * 256]; |
| int ret; |
| |
| if (avs->remaining_audio_size > 0) |
| if (avs_read_audio_packet(s, pkt) > 0) |
| return 0; |
| |
| while (1) { |
| if (avs->remaining_frame_size <= 0) { |
| if (!avio_rl16(s->pb)) /* found EOF */ |
| return AVERROR(EIO); |
| avs->remaining_frame_size = avio_rl16(s->pb) - 4; |
| } |
| |
| while (avs->remaining_frame_size > 0) { |
| sub_type = avio_r8(s->pb); |
| type = avio_r8(s->pb); |
| size = avio_rl16(s->pb); |
| if (size < 4) |
| return AVERROR_INVALIDDATA; |
| avs->remaining_frame_size -= size; |
| |
| switch (type) { |
| case AVS_PALETTE: |
| if (size - 4 > sizeof(palette)) |
| return AVERROR_INVALIDDATA; |
| ret = avio_read(s->pb, palette, size - 4); |
| if (ret < size - 4) |
| return AVERROR(EIO); |
| palette_size = size; |
| break; |
| |
| case AVS_VIDEO: |
| if (!avs->st_video) { |
| avs->st_video = avformat_new_stream(s, NULL); |
| if (!avs->st_video) |
| return AVERROR(ENOMEM); |
| avs->st_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| avs->st_video->codecpar->codec_id = AV_CODEC_ID_AVS; |
| avs->st_video->codecpar->width = avs->width; |
| avs->st_video->codecpar->height = avs->height; |
| avs->st_video->codecpar->bits_per_coded_sample=avs->bits_per_sample; |
| avs->st_video->nb_frames = avs->nb_frames; |
| #if FF_API_R_FRAME_RATE |
| avs->st_video->r_frame_rate = |
| #endif |
| avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1}; |
| } |
| return avs_read_video_packet(s, pkt, type, sub_type, size, |
| palette, palette_size); |
| |
| case AVS_AUDIO: |
| if (!avs->st_audio) { |
| avs->st_audio = avformat_new_stream(s, NULL); |
| if (!avs->st_audio) |
| return AVERROR(ENOMEM); |
| avs->st_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| } |
| avs->remaining_audio_size = size - 4; |
| size = avs_read_audio_packet(s, pkt); |
| if (size != 0) |
| return size; |
| break; |
| |
| default: |
| avio_skip(s->pb, size - 4); |
| } |
| } |
| } |
| } |
| |
| AVInputFormat ff_avs_demuxer = { |
| .name = "avs", |
| .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games Creature Shock"), |
| .priv_data_size = sizeof(AvsFormat), |
| .read_probe = avs_probe, |
| .read_header = avs_read_header, |
| .read_packet = avs_read_packet, |
| }; |