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