Statistics
| Branch: | Revision:

ffmpeg / libavformat / bethsoftvid.c @ a23c9c4a

History | View | Annotate | Download (7.62 KB)

1 1e6c6759 Nicholas Tung
/*
2
 * Bethsoft VID format Demuxer
3
 * Copyright (c) 2007 Nicholas Tung
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
/**
23
 * @file bethsoftvid.c
24
 * @brief Bethesda Softworks VID (.vid) file demuxer
25
 * @author Nicholas Tung [ntung (at. ntung com] (2007-03)
26
 * @sa http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
27
 * @sa http://www.svatopluk.com/andux/docs/dfvid.html
28
 */
29
30
#include "avformat.h"
31
#include "bethsoftvideo.h"
32
33
typedef struct BVID_DemuxContext
34
{
35
    int nframes;
36
    /** delay value between frames, added to individual frame delay.
37
     * custom units, which will be added to other custom units (~=16ms according
38
     * to free, unofficial documentation) */
39
    int bethsoft_global_delay;
40
41
    /** video presentation time stamp.
42
     * delay = 16 milliseconds * (global_delay + per_frame_delay) */
43 90523428 Michael Niedermayer
    int video_pts;
44 1e6c6759 Nicholas Tung
45
    int is_finished;
46
47
} BVID_DemuxContext;
48
49
static int vid_probe(AVProbeData *p)
50
{
51
    // little endian VID tag, file starts with "VID\0"
52 87e87886 Michael Niedermayer
    if (AV_RL32(p->buf) != MKTAG('V', 'I', 'D', 0))
53 1e6c6759 Nicholas Tung
        return 0;
54
55
    return AVPROBE_SCORE_MAX;
56
}
57
58
static int vid_read_header(AVFormatContext *s,
59
                            AVFormatParameters *ap)
60
{
61 8bb57775 Michael Niedermayer
    BVID_DemuxContext *vid = s->priv_data;
62 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
63 1e6c6759 Nicholas Tung
    AVStream *stream;
64
65
    /* load main header. Contents:
66
    *    bytes: 'V' 'I' 'D'
67
    *    int16s: always_512, nframes, width, height, delay, always_14
68
    */
69
    url_fseek(pb, 5, SEEK_CUR);
70
    vid->nframes = get_le16(pb);
71
72
    stream = av_new_stream(s, 0);
73 d5c5c8b4 Michael Niedermayer
    if (!stream)
74 769e10f0 Panagiotis Issaris
        return AVERROR(ENOMEM);
75 1e6c6759 Nicholas Tung
    av_set_pts_info(stream, 32, 1, 60);     // 16 ms increments, i.e. 60 fps
76
    stream->codec->codec_type = CODEC_TYPE_VIDEO;
77
    stream->codec->codec_id = CODEC_ID_BETHSOFTVID;
78
    stream->codec->width = get_le16(pb);
79
    stream->codec->height = get_le16(pb);
80
    stream->codec->pix_fmt = PIX_FMT_PAL8;
81
    vid->bethsoft_global_delay = get_le16(pb);
82
    get_le16(pb);
83
84
    // done with video codec, set up audio codec
85
    stream = av_new_stream(s, 0);
86 d5c5c8b4 Michael Niedermayer
    if (!stream)
87 769e10f0 Panagiotis Issaris
        return AVERROR(ENOMEM);
88 1e6c6759 Nicholas Tung
    stream->codec->codec_type = CODEC_TYPE_AUDIO;
89
    stream->codec->codec_id = CODEC_ID_PCM_U8;
90
    stream->codec->channels = 1;
91
    stream->codec->sample_rate = 11025;
92
    stream->codec->bits_per_sample = 8;
93
    stream->codec->bit_rate = stream->codec->channels * stream->codec->sample_rate * stream->codec->bits_per_sample;
94
95
    return 0;
96
}
97
98
#define BUFFER_PADDING_SIZE 1000
99
static int read_frame(BVID_DemuxContext *vid, ByteIOContext *pb, AVPacket *pkt,
100
                      uint8_t block_type, AVFormatContext *s, int npixels)
101
{
102
    uint8_t * vidbuf_start = NULL;
103
    int vidbuf_nbytes = 0;
104 3e62d187 Michael Niedermayer
    int code;
105 1e6c6759 Nicholas Tung
    int bytes_copied = 0;
106
    int position;
107 fae3a361 Måns Rullgård
    unsigned int vidbuf_capacity;
108 1e6c6759 Nicholas Tung
109
    vidbuf_start = av_malloc(vidbuf_capacity = BUFFER_PADDING_SIZE);
110 d5c5c8b4 Michael Niedermayer
    if(!vidbuf_start)
111 769e10f0 Panagiotis Issaris
        return AVERROR(ENOMEM);
112 1e6c6759 Nicholas Tung
113
    // save the file position for the packet, include block type
114
    position = url_ftell(pb) - 1;
115
116
    vidbuf_start[vidbuf_nbytes++] = block_type;
117
118
    // get the video delay (next int16), and set the presentation time
119
    vid->video_pts += vid->bethsoft_global_delay + get_le16(pb);
120
121
    // set the y offset if it exists (decoder header data should be in data section)
122 d7cf4489 Michael Niedermayer
    if(block_type == VIDEO_YOFF_P_FRAME){
123 d5c5c8b4 Michael Niedermayer
        if(get_buffer(pb, &vidbuf_start[vidbuf_nbytes], 2) != 2)
124 373209f8 Michael Niedermayer
            goto fail;
125 1e6c6759 Nicholas Tung
        vidbuf_nbytes += 2;
126
    }
127
128 d5c5c8b4 Michael Niedermayer
    do{
129 1e6c6759 Nicholas Tung
        vidbuf_start = av_fast_realloc(vidbuf_start, &vidbuf_capacity, vidbuf_nbytes + BUFFER_PADDING_SIZE);
130 d5c5c8b4 Michael Niedermayer
        if(!vidbuf_start)
131 769e10f0 Panagiotis Issaris
            return AVERROR(ENOMEM);
132 1e6c6759 Nicholas Tung
133 3e62d187 Michael Niedermayer
        code = get_byte(pb);
134
        vidbuf_start[vidbuf_nbytes++] = code;
135 1e6c6759 Nicholas Tung
136 3e62d187 Michael Niedermayer
        if(code >= 0x80){ // rle sequence
137 d7cf4489 Michael Niedermayer
            if(block_type == VIDEO_I_FRAME)
138 d5c5c8b4 Michael Niedermayer
                vidbuf_start[vidbuf_nbytes++] = get_byte(pb);
139 3e62d187 Michael Niedermayer
        } else if(code){ // plain sequence
140
            if(get_buffer(pb, &vidbuf_start[vidbuf_nbytes], code) != code)
141 373209f8 Michael Niedermayer
                goto fail;
142 3e62d187 Michael Niedermayer
            vidbuf_nbytes += code;
143 1e6c6759 Nicholas Tung
        }
144 3e62d187 Michael Niedermayer
        bytes_copied += code & 0x7F;
145 d5c5c8b4 Michael Niedermayer
        if(bytes_copied == npixels){ // sometimes no stop character is given, need to keep track of bytes copied
146 1e6c6759 Nicholas Tung
            // may contain a 0 byte even if read all pixels
147 d5c5c8b4 Michael Niedermayer
            if(get_byte(pb))
148
                url_fseek(pb, -1, SEEK_CUR);
149 1e6c6759 Nicholas Tung
            break;
150
        }
151 d5c5c8b4 Michael Niedermayer
        if(bytes_copied > npixels)
152 373209f8 Michael Niedermayer
            goto fail;
153 3e62d187 Michael Niedermayer
    } while(code);
154 1e6c6759 Nicholas Tung
155
    // copy data into packet
156 373209f8 Michael Niedermayer
    if(av_new_packet(pkt, vidbuf_nbytes) < 0)
157
        goto fail;
158 1e6c6759 Nicholas Tung
    memcpy(pkt->data, vidbuf_start, vidbuf_nbytes);
159
    av_free(vidbuf_start);
160
161
    pkt->pos = position;
162
    pkt->stream_index = 0;  // use the video decoder, which was initialized as the first stream
163
    pkt->pts = vid->video_pts;
164
165
    vid->nframes--;  // used to check if all the frames were read
166
    return vidbuf_nbytes;
167 373209f8 Michael Niedermayer
fail:
168
    av_free(vidbuf_start);
169
    return -1;
170 1e6c6759 Nicholas Tung
}
171
172
static int vid_read_packet(AVFormatContext *s,
173
                           AVPacket *pkt)
174
{
175 8bb57775 Michael Niedermayer
    BVID_DemuxContext *vid = s->priv_data;
176 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
177 8bb57775 Michael Niedermayer
    unsigned char block_type;
178 1e6c6759 Nicholas Tung
    int audio_length;
179
    int ret_value;
180
181 d5c5c8b4 Michael Niedermayer
    if(vid->is_finished || url_feof(pb))
182 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
183 1e6c6759 Nicholas Tung
184
    block_type = get_byte(pb);
185 d5c5c8b4 Michael Niedermayer
    switch(block_type){
186 1e6c6759 Nicholas Tung
        case PALETTE_BLOCK:
187
            url_fseek(pb, -1, SEEK_CUR);     // include block type
188 d7cf4489 Michael Niedermayer
            ret_value = av_get_packet(pb, pkt, 3 * 256 + 1);
189
            if(ret_value != 3 * 256 + 1){
190 d5c5c8b4 Michael Niedermayer
                av_free_packet(pkt);
191 6f3e0b21 Panagiotis Issaris
                return AVERROR(EIO);
192 d5c5c8b4 Michael Niedermayer
            }
193 1e6c6759 Nicholas Tung
            pkt->stream_index = 0;
194
            return ret_value;
195
196
        case FIRST_AUDIO_BLOCK:
197 8bb57775 Michael Niedermayer
            get_le16(pb);
198 1e6c6759 Nicholas Tung
            // soundblaster DAC used for sample rate, as on specification page (link above)
199
            s->streams[1]->codec->sample_rate = 1000000 / (256 - get_byte(pb));
200
            s->streams[1]->codec->bit_rate = s->streams[1]->codec->channels * s->streams[1]->codec->sample_rate * s->streams[1]->codec->bits_per_sample;
201
        case AUDIO_BLOCK:
202
            audio_length = get_le16(pb);
203
            ret_value = av_get_packet(pb, pkt, audio_length);
204
            pkt->stream_index = 1;
205 6f3e0b21 Panagiotis Issaris
            return (ret_value != audio_length ? AVERROR(EIO) : ret_value);
206 1e6c6759 Nicholas Tung
207 d7cf4489 Michael Niedermayer
        case VIDEO_P_FRAME:
208
        case VIDEO_YOFF_P_FRAME:
209
        case VIDEO_I_FRAME:
210 1e6c6759 Nicholas Tung
            return read_frame(vid, pb, pkt, block_type, s,
211
                              s->streams[0]->codec->width * s->streams[0]->codec->height);
212
213 d7cf4489 Michael Niedermayer
        case EOF_BLOCK:
214 1e6c6759 Nicholas Tung
            if(vid->nframes != 0)
215
                av_log(s, AV_LOG_VERBOSE, "reached terminating character but not all frames read.\n");
216
            vid->is_finished = 1;
217 6f3e0b21 Panagiotis Issaris
            return AVERROR(EIO);
218 1e6c6759 Nicholas Tung
        default:
219
            av_log(s, AV_LOG_ERROR, "unknown block (character = %c, decimal = %d, hex = %x)!!!\n",
220
                   block_type, block_type, block_type); return -1;
221
    }
222
223
    return 0;
224
}
225
226
AVInputFormat bethsoftvid_demuxer = {
227
    "bethsoftvid",
228
    "Bethesda Softworks 'Daggerfall' VID format",
229
    sizeof(BVID_DemuxContext),
230
    vid_probe,
231
    vid_read_header,
232
    vid_read_packet,
233
};