/* * AVS demuxer. * Copyright (c) 2006 Aurelien Jacobs * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #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(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 + 1; 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) { av_packet_unref(pkt); 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, 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; 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); } } } } static int avs_read_close(AVFormatContext * s) { return 0; } AVInputFormat ff_avs_demuxer = { .name = "avs", .long_name = NULL_IF_CONFIG_SMALL("AVS"), .priv_data_size = sizeof(AvsFormat), .read_probe = avs_probe, .read_header = avs_read_header, .read_packet = avs_read_packet, .read_close = avs_read_close, };