mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-24 12:09:55 +00:00
264 lines
8.1 KiB
C
264 lines
8.1 KiB
C
/*
|
|
* Sierra VMD Format Demuxer
|
|
* Copyright (c) 2004 The ffmpeg Project
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
/**
|
|
* @file sierravmd.c
|
|
* Sierra VMD file demuxer
|
|
* by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
|
|
#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
|
|
#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
|
|
(((uint8_t*)(x))[2] << 16) | \
|
|
(((uint8_t*)(x))[1] << 8) | \
|
|
((uint8_t*)(x))[0])
|
|
|
|
#define VMD_HEADER_SIZE 0x0330
|
|
#define BYTES_PER_FRAME_RECORD 16
|
|
|
|
typedef struct {
|
|
int stream_index;
|
|
offset_t frame_offset;
|
|
unsigned int frame_size;
|
|
int64_t pts;
|
|
int keyframe;
|
|
unsigned char frame_record[BYTES_PER_FRAME_RECORD];
|
|
} vmd_frame_t;
|
|
|
|
typedef struct VmdDemuxContext {
|
|
int video_stream_index;
|
|
int audio_stream_index;
|
|
|
|
unsigned int audio_type;
|
|
unsigned int audio_samplerate;
|
|
unsigned int audio_bits;
|
|
unsigned int audio_channels;
|
|
|
|
unsigned int frame_count;
|
|
vmd_frame_t *frame_table;
|
|
unsigned int current_frame;
|
|
|
|
unsigned char vmd_header[VMD_HEADER_SIZE];
|
|
} VmdDemuxContext;
|
|
|
|
static int vmd_probe(AVProbeData *p)
|
|
{
|
|
if (p->buf_size < 2)
|
|
return 0;
|
|
|
|
/* check if the first 2 bytes of the file contain the appropriate size
|
|
* of a VMD header chunk */
|
|
if (LE_16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
|
|
return 0;
|
|
|
|
/* only return half certainty since this check is a bit sketchy */
|
|
return AVPROBE_SCORE_MAX / 2;
|
|
}
|
|
|
|
static int vmd_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
AVStream *st;
|
|
unsigned int toc_offset;
|
|
unsigned char *raw_frame_table;
|
|
int raw_frame_table_size;
|
|
unsigned char *current_frame_record;
|
|
offset_t current_offset;
|
|
int i;
|
|
int sample_rate;
|
|
unsigned int total_frames;
|
|
int video_frame_count = 0;
|
|
|
|
/* fetch the main header, including the 2 header length bytes */
|
|
url_fseek(pb, 0, SEEK_SET);
|
|
if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
|
|
return -EIO;
|
|
|
|
/* start up the decoders */
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR_NOMEM;
|
|
vmd->video_stream_index = st->index;
|
|
st->codec.codec_type = CODEC_TYPE_VIDEO;
|
|
st->codec.codec_id = CODEC_ID_VMDVIDEO;
|
|
st->codec.codec_tag = 0; /* no fourcc */
|
|
st->codec.width = LE_16(&vmd->vmd_header[12]);
|
|
st->codec.height = LE_16(&vmd->vmd_header[14]);
|
|
st->codec.extradata_size = VMD_HEADER_SIZE;
|
|
st->codec.extradata = av_malloc(VMD_HEADER_SIZE);
|
|
memcpy(st->codec.extradata, vmd->vmd_header, VMD_HEADER_SIZE);
|
|
|
|
/* if sample rate is 0, assume no audio */
|
|
sample_rate = LE_16(&vmd->vmd_header[804]);
|
|
if (sample_rate) {
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR_NOMEM;
|
|
vmd->audio_stream_index = st->index;
|
|
st->codec.codec_type = CODEC_TYPE_AUDIO;
|
|
st->codec.codec_id = CODEC_ID_VMDAUDIO;
|
|
st->codec.codec_tag = 0; /* no codec tag */
|
|
st->codec.channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
|
|
st->codec.sample_rate = sample_rate;
|
|
st->codec.bit_rate = st->codec.sample_rate *
|
|
st->codec.bits_per_sample * st->codec.channels;
|
|
st->codec.block_align = LE_16(&vmd->vmd_header[806]);
|
|
if (st->codec.block_align & 0x8000) {
|
|
st->codec.bits_per_sample = 16;
|
|
st->codec.block_align = -(st->codec.block_align - 0x10000);
|
|
} else
|
|
st->codec.bits_per_sample = 8;
|
|
}
|
|
|
|
/* skip over the offset table and load the table of contents; don't
|
|
* care about the offset table since demuxer will calculate those
|
|
* independently */
|
|
toc_offset = LE_32(&vmd->vmd_header[812]);
|
|
vmd->frame_count = LE_16(&vmd->vmd_header[6]);
|
|
url_fseek(pb, toc_offset + vmd->frame_count * 6, SEEK_SET);
|
|
|
|
/* each on-disk VMD frame has an audio part and a video part; demuxer
|
|
* accounts them separately */
|
|
vmd->frame_count *= 2;
|
|
raw_frame_table = NULL;
|
|
vmd->frame_table = NULL;
|
|
raw_frame_table_size = vmd->frame_count * BYTES_PER_FRAME_RECORD;
|
|
raw_frame_table = av_malloc(raw_frame_table_size);
|
|
vmd->frame_table = av_malloc(vmd->frame_count * sizeof(vmd_frame_t));
|
|
if (!raw_frame_table || !vmd->frame_table) {
|
|
av_free(raw_frame_table);
|
|
av_free(vmd->frame_table);
|
|
return AVERROR_NOMEM;
|
|
}
|
|
if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
|
|
raw_frame_table_size) {
|
|
av_free(raw_frame_table);
|
|
av_free(vmd->frame_table);
|
|
return -EIO;
|
|
}
|
|
|
|
current_offset = LE_32(&vmd->vmd_header[20]);
|
|
current_frame_record = raw_frame_table;
|
|
total_frames = vmd->frame_count;
|
|
i = 0;
|
|
while (total_frames--) {
|
|
|
|
/* if the frame size is 0, do not count the frame and bring the
|
|
* total frame count down */
|
|
vmd->frame_table[i].frame_size = LE_32(¤t_frame_record[2]);
|
|
|
|
/* this logic is present so that 0-length audio chunks are not
|
|
* accounted */
|
|
if (!vmd->frame_table[i].frame_size) {
|
|
vmd->frame_count--; /* one less frame to count */
|
|
current_frame_record += BYTES_PER_FRAME_RECORD;
|
|
continue;
|
|
}
|
|
|
|
if (current_frame_record[0] == 0x02)
|
|
vmd->frame_table[i].stream_index = vmd->video_stream_index;
|
|
else
|
|
vmd->frame_table[i].stream_index = vmd->audio_stream_index;
|
|
vmd->frame_table[i].frame_offset = current_offset;
|
|
current_offset += vmd->frame_table[i].frame_size;
|
|
memcpy(vmd->frame_table[i].frame_record, current_frame_record,
|
|
BYTES_PER_FRAME_RECORD);
|
|
|
|
if (current_frame_record[0] == 0x02) {
|
|
/* assume 15 fps for now */
|
|
vmd->frame_table[i].pts = video_frame_count++;
|
|
vmd->frame_table[i].pts *= 90000;
|
|
vmd->frame_table[i].pts /= 15;
|
|
}
|
|
|
|
current_frame_record += BYTES_PER_FRAME_RECORD;
|
|
i++;
|
|
}
|
|
|
|
av_free(raw_frame_table);
|
|
|
|
/* set the pts reference at 1 pts = 1/90000 sec */
|
|
s->pts_num = 1;
|
|
s->pts_den = 90000;
|
|
|
|
vmd->current_frame = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vmd_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
int ret = 0;
|
|
vmd_frame_t *frame;
|
|
|
|
if (vmd->current_frame >= vmd->frame_count)
|
|
return -EIO;
|
|
|
|
frame = &vmd->frame_table[vmd->current_frame];
|
|
/* position the stream (will probably be there already) */
|
|
url_fseek(pb, frame->frame_offset, SEEK_SET);
|
|
|
|
if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
|
|
return AVERROR_NOMEM;
|
|
memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
|
|
ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
|
|
frame->frame_size);
|
|
|
|
if (ret != frame->frame_size)
|
|
ret = -EIO;
|
|
pkt->stream_index = frame->stream_index;
|
|
pkt->pts = frame->pts;
|
|
|
|
vmd->current_frame++;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int vmd_read_close(AVFormatContext *s)
|
|
{
|
|
VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
|
|
|
|
av_free(vmd->frame_table);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static AVInputFormat vmd_iformat = {
|
|
"vmd",
|
|
"Sierra VMD format",
|
|
sizeof(VmdDemuxContext),
|
|
vmd_probe,
|
|
vmd_read_header,
|
|
vmd_read_packet,
|
|
vmd_read_close,
|
|
};
|
|
|
|
int vmd_init(void)
|
|
{
|
|
av_register_input_format(&vmd_iformat);
|
|
return 0;
|
|
}
|