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
26enum BMVFlags {
27    BMV_NOP = 0,
28    BMV_END,
29    BMV_DELTA,
30    BMV_INTRA,
31
32    BMV_AUDIO   = 0x20,
33};
34
35typedef struct BMVContext {
36    uint8_t *packet;
37    int      size;
38    int      get_next;
39    int64_t  audio_pos;
40} BMVContext;
41
42static 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
71static 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
119static 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
128AVInputFormat 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};
137