/* * 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 St, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avformat.h" #include "voc.h" typedef struct avs_format { voc_dec_context_t 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; } avs_format_t; typedef enum avs_block_type { AVS_VIDEO = 0x01, AVS_AUDIO = 0x02, AVS_PALETTE = 0x03, AVS_GAME_DATA = 0x04, } avs_block_type_t; static int avs_probe(AVProbeData * p) { const uint8_t *d; if (p->buf_size < 2) return 0; d = p->buf; if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0) return 50; return 0; } static int avs_read_header(AVFormatContext * s, AVFormatParameters * ap) { avs_format_t *avs = s->priv_data; s->ctx_flags |= AVFMTCTX_NOHEADER; url_fskip(&s->pb, 4); avs->width = get_le16(&s->pb); avs->height = get_le16(&s->pb); avs->bits_per_sample = get_le16(&s->pb); avs->fps = get_le16(&s->pb); avs->nb_frames = get_le32(&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, avs_block_type_t type, int sub_type, int size, uint8_t * palette, int palette_size) { avs_format_t *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 = get_buffer(&s->pb, pkt->data + palette_size + 4, size - 4) + 4; if (ret < size) { av_free_packet(pkt); return AVERROR_IO; } pkt->size = ret + palette_size; pkt->stream_index = avs->st_video->index; if (sub_type == 0) pkt->flags |= PKT_FLAG_KEY; return 0; } static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt) { avs_format_t *avs = s->priv_data; int ret, size; size = url_ftell(&s->pb); ret = voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size); size = url_ftell(&s->pb) - size; avs->remaining_audio_size -= size; if (ret == AVERROR_IO) return 0; /* this indicate EOS */ if (ret < 0) return ret; pkt->stream_index = avs->st_audio->index; pkt->flags |= PKT_FLAG_KEY; return size; } static int avs_read_packet(AVFormatContext * s, AVPacket * pkt) { avs_format_t *avs = s->priv_data; int sub_type = 0, size = 0; avs_block_type_t type = 0; 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 (!get_le16(&s->pb)) /* found EOF */ return AVERROR_IO; avs->remaining_frame_size = get_le16(&s->pb) - 4; } while (avs->remaining_frame_size > 0) { sub_type = get_byte(&s->pb); type = get_byte(&s->pb); size = get_le16(&s->pb); avs->remaining_frame_size -= size; switch (type) { case AVS_PALETTE: ret = get_buffer(&s->pb, palette, size - 4); if (ret < size - 4) return AVERROR_IO; palette_size = size; break; case AVS_VIDEO: if (!avs->st_video) { avs->st_video = av_new_stream(s, AVS_VIDEO); if (avs->st_video == NULL) return AVERROR_NOMEM; avs->st_video->codec->codec_type = CODEC_TYPE_VIDEO; avs->st_video->codec->codec_id = CODEC_ID_AVS; avs->st_video->codec->width = avs->width; avs->st_video->codec->height = avs->height; avs->st_video->codec->bits_per_sample=avs->bits_per_sample; avs->st_video->nb_frames = avs->nb_frames; avs->st_video->codec->time_base = (AVRational) { 1, avs->fps}; } return avs_read_video_packet(s, pkt, type, sub_type, size, palette, palette_size); case AVS_AUDIO: if (!avs->st_audio) { avs->st_audio = av_new_stream(s, AVS_AUDIO); if (avs->st_audio == NULL) return AVERROR_NOMEM; avs->st_audio->codec->codec_type = CODEC_TYPE_AUDIO; } avs->remaining_audio_size = size - 4; size = avs_read_audio_packet(s, pkt); if (size != 0) return size; break; default: url_fskip(&s->pb, size - 4); } } } } static int avs_read_close(AVFormatContext * s) { return 0; } AVInputFormat avs_demuxer = { "avs", "avs format", sizeof(avs_format_t), avs_probe, avs_read_header, avs_read_packet, avs_read_close, };