1/* 2 * Discworld II BMV demuxer 3 * Copyright (c) 2011 Konstantin Shishkov. 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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 "internal.h" 24 25enum BMVFlags { 26 BMV_NOP = 0, 27 BMV_END, 28 BMV_DELTA, 29 BMV_INTRA, 30 31 BMV_AUDIO = 0x20, 32}; 33 34typedef struct BMVContext { 35 uint8_t *packet; 36 int size; 37 int get_next; 38 int64_t audio_pos; 39} BMVContext; 40 41static int bmv_read_header(AVFormatContext *s, AVFormatParameters *ap) 42{ 43 AVStream *st, *ast; 44 BMVContext *c = s->priv_data; 45 46 st = avformat_new_stream(s, 0); 47 if (!st) 48 return AVERROR(ENOMEM); 49 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 50 st->codec->codec_id = CODEC_ID_BMV_VIDEO; 51 st->codec->width = 640; 52 st->codec->height = 429; 53 st->codec->pix_fmt = PIX_FMT_PAL8; 54 avpriv_set_pts_info(st, 16, 1, 12); 55 ast = avformat_new_stream(s, 0); 56 if (!ast) 57 return AVERROR(ENOMEM); 58 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; 59 ast->codec->codec_id = CODEC_ID_BMV_AUDIO; 60 ast->codec->channels = 2; 61 ast->codec->sample_rate = 22050; 62 avpriv_set_pts_info(ast, 16, 1, 22050); 63 64 c->get_next = 1; 65 c->audio_pos = 0; 66 return 0; 67} 68 69static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt) 70{ 71 BMVContext *c = s->priv_data; 72 int type; 73 void *tmp; 74 75 while (c->get_next) { 76 if (s->pb->eof_reached) 77 return AVERROR_EOF; 78 type = avio_r8(s->pb); 79 if (type == BMV_NOP) 80 continue; 81 if (type == BMV_END) 82 return AVERROR_EOF; 83 c->size = avio_rl24(s->pb); 84 if (!c->size) 85 return AVERROR_INVALIDDATA; 86 tmp = av_realloc(c->packet, c->size + 1); 87 if (!tmp) 88 return AVERROR(ENOMEM); 89 c->packet = tmp; 90 c->packet[0] = type; 91 if (avio_read(s->pb, c->packet + 1, c->size) != c->size) 92 return AVERROR(EIO); 93 if (type & BMV_AUDIO) { 94 int audio_size = c->packet[1] * 65 + 1; 95 if (audio_size >= c->size) { 96 av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n", 97 audio_size, c->size); 98 return AVERROR_INVALIDDATA; 99 } 100 if (av_new_packet(pkt, audio_size) < 0) 101 return AVERROR(ENOMEM); 102 memcpy(pkt->data, c->packet + 1, pkt->size); 103 pkt->stream_index = 1; 104 pkt->pts = c->audio_pos; 105 pkt->duration = c->packet[1] * 32; 106 c->audio_pos += pkt->duration; 107 c->get_next = 0; 108 return pkt->size; 109 } else 110 break; 111 } 112 if (av_new_packet(pkt, c->size + 1) < 0) 113 return AVERROR(ENOMEM); 114 pkt->stream_index = 0; 115 c->get_next = 1; 116 memcpy(pkt->data, c->packet, pkt->size); 117 return pkt->size; 118} 119 120static int bmv_read_close(AVFormatContext *s) 121{ 122 BMVContext *c = s->priv_data; 123 124 av_freep(&c->packet); 125 126 return 0; 127} 128 129AVInputFormat ff_bmv_demuxer = { 130 .name = "bmv", 131 .long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV"), 132 .priv_data_size = sizeof(BMVContext), 133 .read_header = bmv_read_header, 134 .read_packet = bmv_read_packet, 135 .read_close = bmv_read_close, 136 .extensions = "bmv" 137}; 138