yading@11: /*
yading@11:  * Discworld II BMV demuxer
yading@11:  * Copyright (c) 2011 Konstantin Shishkov.
yading@11:  *
yading@11:  * This file is part of Libav.
yading@11:  *
yading@11:  * Libav is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * Libav is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with Libav; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: enum BMVFlags {
yading@11:     BMV_NOP = 0,
yading@11:     BMV_END,
yading@11:     BMV_DELTA,
yading@11:     BMV_INTRA,
yading@11: 
yading@11:     BMV_AUDIO   = 0x20,
yading@11: };
yading@11: 
yading@11: typedef struct BMVContext {
yading@11:     uint8_t *packet;
yading@11:     int      size;
yading@11:     int      get_next;
yading@11:     int64_t  audio_pos;
yading@11: } BMVContext;
yading@11: 
yading@11: static int bmv_read_header(AVFormatContext *s)
yading@11: {
yading@11:     AVStream *st, *ast;
yading@11:     BMVContext *c = s->priv_data;
yading@11: 
yading@11:     st = avformat_new_stream(s, 0);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     st->codec->codec_id   = AV_CODEC_ID_BMV_VIDEO;
yading@11:     st->codec->width      = 640;
yading@11:     st->codec->height     = 429;
yading@11:     st->codec->pix_fmt    = AV_PIX_FMT_PAL8;
yading@11:     avpriv_set_pts_info(st, 16, 1, 12);
yading@11:     ast = avformat_new_stream(s, 0);
yading@11:     if (!ast)
yading@11:         return AVERROR(ENOMEM);
yading@11:     ast->codec->codec_type      = AVMEDIA_TYPE_AUDIO;
yading@11:     ast->codec->codec_id        = AV_CODEC_ID_BMV_AUDIO;
yading@11:     ast->codec->channels        = 2;
yading@11:     ast->codec->channel_layout  = AV_CH_LAYOUT_STEREO;
yading@11:     ast->codec->sample_rate     = 22050;
yading@11:     avpriv_set_pts_info(ast, 16, 1, 22050);
yading@11: 
yading@11:     c->get_next  = 1;
yading@11:     c->audio_pos = 0;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     BMVContext *c = s->priv_data;
yading@11:     int type;
yading@11:     void *tmp;
yading@11: 
yading@11:     while (c->get_next) {
yading@11:         if (s->pb->eof_reached)
yading@11:             return AVERROR_EOF;
yading@11:         type = avio_r8(s->pb);
yading@11:         if (type == BMV_NOP)
yading@11:             continue;
yading@11:         if (type == BMV_END)
yading@11:             return AVERROR_EOF;
yading@11:         c->size = avio_rl24(s->pb);
yading@11:         if (!c->size)
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         tmp = av_realloc(c->packet, c->size + 1);
yading@11:         if (!tmp)
yading@11:             return AVERROR(ENOMEM);
yading@11:         c->packet = tmp;
yading@11:         c->packet[0] = type;
yading@11:         if (avio_read(s->pb, c->packet + 1, c->size) != c->size)
yading@11:             return AVERROR(EIO);
yading@11:         if (type & BMV_AUDIO) {
yading@11:             int audio_size = c->packet[1] * 65 + 1;
yading@11:             if (audio_size >= c->size) {
yading@11:                 av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n",
yading@11:                        audio_size, c->size);
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             }
yading@11:             if (av_new_packet(pkt, audio_size) < 0)
yading@11:                 return AVERROR(ENOMEM);
yading@11:             memcpy(pkt->data, c->packet + 1, pkt->size);
yading@11:             pkt->stream_index = 1;
yading@11:             pkt->pts          = c->audio_pos;
yading@11:             pkt->duration     = c->packet[1] * 32;
yading@11:             c->audio_pos += pkt->duration;
yading@11:             c->get_next   = 0;
yading@11:             return pkt->size;
yading@11:         } else
yading@11:             break;
yading@11:     }
yading@11:     if (av_new_packet(pkt, c->size + 1) < 0)
yading@11:         return AVERROR(ENOMEM);
yading@11:     pkt->stream_index = 0;
yading@11:     c->get_next = 1;
yading@11:     memcpy(pkt->data, c->packet, pkt->size);
yading@11:     return pkt->size;
yading@11: }
yading@11: 
yading@11: static int bmv_read_close(AVFormatContext *s)
yading@11: {
yading@11:     BMVContext *c = s->priv_data;
yading@11: 
yading@11:     av_freep(&c->packet);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_bmv_demuxer = {
yading@11:     .name           = "bmv",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Discworld II BMV"),
yading@11:     .priv_data_size = sizeof(BMVContext),
yading@11:     .read_header    = bmv_read_header,
yading@11:     .read_packet    = bmv_read_packet,
yading@11:     .read_close     = bmv_read_close,
yading@11:     .extensions     = "bmv",
yading@11: };