Commit a7eb3c8d authored by Mike Melanson's avatar Mike Melanson
Browse files

initial commit for Sierra VMD file demuxer

Originally committed as revision 2653 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent fafa0b75
......@@ -15,7 +15,8 @@ PPOBJS=
OBJS+=mpeg.o mpegts.o mpegtsenc.o ffm.o crc.o img.o raw.o rm.o \
avienc.o avidec.o wav.o swf.o au.o gif.o mov.o mpjpeg.o dv.o \
yuv4mpeg.o 4xm.o flvenc.o flvdec.o movenc.o psxstr.o idroq.o ipmovie.o \
nut.o wc3movie.o mp3.o westwood.o segafilm.o idcin.o flic.o
nut.o wc3movie.o mp3.o westwood.o segafilm.o idcin.o flic.o \
sierravmd.o
ifeq ($(CONFIG_RISKY),yes)
OBJS+= asf.o
......
......@@ -70,6 +70,7 @@ void av_register_all(void)
film_init();
idcin_init();
flic_init();
vmd_init();
#if defined(AMR_NB) || defined(AMR_NB_FIXED) || defined(AMR_WB)
amr_init();
......
......@@ -480,6 +480,9 @@ int idcin_init(void);
/* flic.c */
int flic_init(void);
/* sierravmd.c */
int vmd_init(void);
#include "rtp.h"
#include "rtsp.h"
......
/*
* 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(&current_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;
}
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