| 1 | /* |
| 2 | * Discworld II BMV demuxer |
| 3 | * Copyright (c) 2011 Konstantin Shishkov. |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "libavutil/channel_layout.h" |
| 23 | #include "avformat.h" |
| 24 | #include "internal.h" |
| 25 | |
| 26 | enum BMVFlags { |
| 27 | BMV_NOP = 0, |
| 28 | BMV_END, |
| 29 | BMV_DELTA, |
| 30 | BMV_INTRA, |
| 31 | |
| 32 | BMV_AUDIO = 0x20, |
| 33 | }; |
| 34 | |
| 35 | typedef struct BMVContext { |
| 36 | uint8_t *packet; |
| 37 | int size; |
| 38 | int get_next; |
| 39 | int64_t audio_pos; |
| 40 | } BMVContext; |
| 41 | |
| 42 | static int bmv_read_header(AVFormatContext *s) |
| 43 | { |
| 44 | AVStream *st, *ast; |
| 45 | BMVContext *c = s->priv_data; |
| 46 | |
| 47 | st = avformat_new_stream(s, 0); |
| 48 | if (!st) |
| 49 | return AVERROR(ENOMEM); |
| 50 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 51 | st->codec->codec_id = AV_CODEC_ID_BMV_VIDEO; |
| 52 | st->codec->width = 640; |
| 53 | st->codec->height = 429; |
| 54 | st->codec->pix_fmt = AV_PIX_FMT_PAL8; |
| 55 | avpriv_set_pts_info(st, 16, 1, 12); |
| 56 | ast = avformat_new_stream(s, 0); |
| 57 | if (!ast) |
| 58 | return AVERROR(ENOMEM); |
| 59 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 60 | ast->codec->codec_id = AV_CODEC_ID_BMV_AUDIO; |
| 61 | ast->codec->channels = 2; |
| 62 | ast->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
| 63 | ast->codec->sample_rate = 22050; |
| 64 | avpriv_set_pts_info(ast, 16, 1, 22050); |
| 65 | |
| 66 | c->get_next = 1; |
| 67 | c->audio_pos = 0; |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 72 | { |
| 73 | BMVContext *c = s->priv_data; |
| 74 | int type, err; |
| 75 | |
| 76 | while (c->get_next) { |
| 77 | if (s->pb->eof_reached) |
| 78 | return AVERROR_EOF; |
| 79 | type = avio_r8(s->pb); |
| 80 | if (type == BMV_NOP) |
| 81 | continue; |
| 82 | if (type == BMV_END) |
| 83 | return AVERROR_EOF; |
| 84 | c->size = avio_rl24(s->pb); |
| 85 | if (!c->size) |
| 86 | return AVERROR_INVALIDDATA; |
| 87 | if ((err = av_reallocp(&c->packet, c->size + 1)) < 0) |
| 88 | return err; |
| 89 | c->packet[0] = type; |
| 90 | if (avio_read(s->pb, c->packet + 1, c->size) != c->size) |
| 91 | return AVERROR(EIO); |
| 92 | if (type & BMV_AUDIO) { |
| 93 | int audio_size = c->packet[1] * 65 + 1; |
| 94 | if (audio_size >= c->size) { |
| 95 | av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n", |
| 96 | audio_size, c->size); |
| 97 | return AVERROR_INVALIDDATA; |
| 98 | } |
| 99 | if (av_new_packet(pkt, audio_size) < 0) |
| 100 | return AVERROR(ENOMEM); |
| 101 | memcpy(pkt->data, c->packet + 1, pkt->size); |
| 102 | pkt->stream_index = 1; |
| 103 | pkt->pts = c->audio_pos; |
| 104 | pkt->duration = c->packet[1] * 32; |
| 105 | c->audio_pos += pkt->duration; |
| 106 | c->get_next = 0; |
| 107 | return pkt->size; |
| 108 | } else |
| 109 | break; |
| 110 | } |
| 111 | if (av_new_packet(pkt, c->size + 1) < 0) |
| 112 | return AVERROR(ENOMEM); |
| 113 | pkt->stream_index = 0; |
| 114 | c->get_next = 1; |
| 115 | memcpy(pkt->data, c->packet, pkt->size); |
| 116 | return pkt->size; |
| 117 | } |
| 118 | |
| 119 | static int bmv_read_close(AVFormatContext *s) |
| 120 | { |
| 121 | BMVContext *c = s->priv_data; |
| 122 | |
| 123 | av_freep(&c->packet); |
| 124 | |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | AVInputFormat ff_bmv_demuxer = { |
| 129 | .name = "bmv", |
| 130 | .long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV"), |
| 131 | .priv_data_size = sizeof(BMVContext), |
| 132 | .read_header = bmv_read_header, |
| 133 | .read_packet = bmv_read_packet, |
| 134 | .read_close = bmv_read_close, |
| 135 | .extensions = "bmv", |
| 136 | }; |