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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Discworld II BMV demuxer |
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| 3 | * Copyright (c) 2011 Konstantin Shishkov. |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavutil/channel_layout.h" |
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| 23 | #include "avformat.h" |
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| 24 | #include "internal.h" |
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| 25 | |||
| 26 | enum BMVFlags { |
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| 27 | BMV_NOP = 0, |
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| 28 | BMV_END, |
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| 29 | BMV_DELTA, |
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| 30 | BMV_INTRA, |
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| 31 | |||
| 32 | BMV_AUDIO = 0x20, |
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| 33 | }; |
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| 34 | |||
| 35 | typedef struct BMVContext { |
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| 36 | uint8_t *packet; |
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| 37 | int size; |
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| 38 | int get_next; |
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| 39 | int64_t audio_pos; |
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| 40 | } BMVContext; |
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| 41 | |||
| 42 | static int bmv_read_header(AVFormatContext *s) |
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| 43 | { |
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| 44 | AVStream *st, *ast; |
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| 45 | BMVContext *c = s->priv_data; |
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| 46 | |||
| 47 | st = avformat_new_stream(s, 0); |
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| 48 | if (!st) |
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| 49 | return AVERROR(ENOMEM); |
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| 50 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 51 | st->codec->codec_id = AV_CODEC_ID_BMV_VIDEO; |
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| 52 | st->codec->width = 640; |
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| 53 | st->codec->height = 429; |
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| 54 | st->codec->pix_fmt = AV_PIX_FMT_PAL8; |
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| 55 | avpriv_set_pts_info(st, 16, 1, 12); |
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| 56 | ast = avformat_new_stream(s, 0); |
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| 57 | if (!ast) |
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| 58 | return AVERROR(ENOMEM); |
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| 59 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 60 | ast->codec->codec_id = AV_CODEC_ID_BMV_AUDIO; |
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| 61 | ast->codec->channels = 2; |
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| 62 | ast->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
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| 63 | ast->codec->sample_rate = 22050; |
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| 64 | avpriv_set_pts_info(ast, 16, 1, 22050); |
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| 65 | |||
| 66 | c->get_next = 1; |
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| 67 | c->audio_pos = 0; |
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| 68 | return 0; |
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| 69 | } |
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| 70 | |||
| 71 | static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 72 | { |
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| 73 | BMVContext *c = s->priv_data; |
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| 74 | int type, err; |
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| 75 | |||
| 76 | while (c->get_next) { |
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| 77 | if (s->pb->eof_reached) |
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| 78 | return AVERROR_EOF; |
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| 79 | type = avio_r8(s->pb); |
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| 80 | if (type == BMV_NOP) |
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| 81 | continue; |
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| 82 | if (type == BMV_END) |
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| 83 | return AVERROR_EOF; |
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| 84 | c->size = avio_rl24(s->pb); |
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| 85 | if (!c->size) |
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| 86 | return AVERROR_INVALIDDATA; |
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| 87 | if ((err = av_reallocp(&c->packet, c->size + 1)) < 0) |
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| 88 | return err; |
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| 89 | c->packet[0] = type; |
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| 90 | if (avio_read(s->pb, c->packet + 1, c->size) != c->size) |
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| 91 | return AVERROR(EIO); |
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| 92 | if (type & BMV_AUDIO) { |
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| 93 | int audio_size = c->packet[1] * 65 + 1; |
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| 94 | if (audio_size >= c->size) { |
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| 95 | av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n", |
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| 96 | audio_size, c->size); |
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| 97 | return AVERROR_INVALIDDATA; |
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| 98 | } |
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| 99 | if (av_new_packet(pkt, audio_size) < 0) |
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| 100 | return AVERROR(ENOMEM); |
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| 101 | memcpy(pkt->data, c->packet + 1, pkt->size); |
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| 102 | pkt->stream_index = 1; |
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| 103 | pkt->pts = c->audio_pos; |
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| 104 | pkt->duration = c->packet[1] * 32; |
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| 105 | c->audio_pos += pkt->duration; |
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| 106 | c->get_next = 0; |
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| 107 | return pkt->size; |
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| 108 | } else |
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| 109 | break; |
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| 110 | } |
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| 111 | if (av_new_packet(pkt, c->size + 1) < 0) |
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| 112 | return AVERROR(ENOMEM); |
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| 113 | pkt->stream_index = 0; |
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| 114 | c->get_next = 1; |
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| 115 | memcpy(pkt->data, c->packet, pkt->size); |
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| 116 | return pkt->size; |
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| 117 | } |
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| 118 | |||
| 119 | static int bmv_read_close(AVFormatContext *s) |
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| 120 | { |
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| 121 | BMVContext *c = s->priv_data; |
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| 122 | |||
| 123 | av_freep(&c->packet); |
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| 124 | |||
| 125 | return 0; |
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| 126 | } |
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| 127 | |||
| 128 | AVInputFormat ff_bmv_demuxer = { |
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| 129 | .name = "bmv", |
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| 130 | .long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV"), |
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| 131 | .priv_data_size = sizeof(BMVContext), |
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| 132 | .read_header = bmv_read_header, |
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| 133 | .read_packet = bmv_read_packet, |
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| 134 | .read_close = bmv_read_close, |
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| 135 | .extensions = "bmv", |
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| 136 | }; |