static void *open_avi(const char *filename, movie_info *info)
{
const avi_movie_info *aviinfo;
avi_error avierr;
avi_file *avi;
/* open the file */
avierr = avi_open(filename, &avi);
if (avierr != AVIERR_NONE)
{
fprintf(stderr, "Error opening AVI file: %s\n", avi_error_string(avierr));
return NULL;
}
/* extract movie info */
aviinfo = avi_get_movie_info(avi);
info->framerate = (double)aviinfo->video_timescale / (double)aviinfo->video_sampletime;
info->numframes = aviinfo->video_numsamples;
info->width = aviinfo->video_width;
info->height = aviinfo->video_height;
info->samplerate = aviinfo->audio_samplerate;
info->channels = aviinfo->audio_channels;
return avi;
}
static bool read_avi(void *file, int frame, bitmap_yuy16 &bitmap, INT16 *lsound, INT16 *rsound, int &samples)
{
avi_file *avifile = reinterpret_cast<avi_file *>(file);
// read the frame
avi_error avierr = avi_read_video_frame(avifile, frame, bitmap);
if (avierr != AVIERR_NONE)
return FALSE;
// read the samples
const avi_movie_info *aviinfo = avi_get_movie_info(avifile);
UINT32 firstsample = (UINT64(aviinfo->audio_samplerate) * UINT64(frame) * UINT64(aviinfo->video_sampletime) + aviinfo->video_timescale - 1) / UINT64(aviinfo->video_timescale);
UINT32 lastsample = (UINT64(aviinfo->audio_samplerate) * UINT64(frame + 1) * UINT64(aviinfo->video_sampletime) + aviinfo->video_timescale - 1) / UINT64(aviinfo->video_timescale);
avierr = avi_read_sound_samples(avifile, 0, firstsample, lastsample - firstsample, lsound);
avierr = avi_read_sound_samples(avifile, 1, firstsample, lastsample - firstsample, rsound);
if (avierr != AVIERR_NONE)
return false;
samples = lastsample - firstsample;
return true;
}
static int read_avi(void *file, int frame, bitmap_yuy16 &bitmap, INT16 *lsound, INT16 *rsound, int *samples)
{
const avi_movie_info *aviinfo = avi_get_movie_info((avi_file *)file);
UINT32 firstsample = ((UINT64)aviinfo->audio_samplerate * (UINT64)frame * (UINT64)aviinfo->video_sampletime + aviinfo->video_timescale - 1) / (UINT64)aviinfo->video_timescale;
UINT32 lastsample = ((UINT64)aviinfo->audio_samplerate * (UINT64)(frame + 1) * (UINT64)aviinfo->video_sampletime + aviinfo->video_timescale - 1) / (UINT64)aviinfo->video_timescale;
avi_error avierr;
/* read the frame */
avierr = avi_read_video_frame((avi_file *)file, frame, bitmap);
if (avierr != AVIERR_NONE)
return FALSE;
/* read the samples */
avierr = avi_read_sound_samples((avi_file *)file, 0, firstsample, lastsample - firstsample, lsound);
avierr = avi_read_sound_samples((avi_file *)file, 1, firstsample, lastsample - firstsample, rsound);
if (avierr != AVIERR_NONE)
return FALSE;
*samples = lastsample - firstsample;
return TRUE;
}
static int generate_from_avi(const char *aviname)
{
UINT32 line12 = 0, line13 = 0, line14 = 0, framenum = 0, chapternum = 0;
const avi_movie_info *info;
bitmap_t *bitmap;
avi_error avierr;
avi_file *avi;
int white = 0;
int frame;
/* open the file */
avierr = avi_open(aviname, &avi);
if (avierr != AVIERR_NONE)
{
fprintf(stderr, "Error opening AVI file: %s\n", avi_error_string(avierr));
return 1;
}
/* extract movie info */
info = avi_get_movie_info(avi);
fprintf(stderr, "%dx%d - %d frames total\n", info->video_width, info->video_height, info->video_numsamples);
if (info->video_height != 39)
{
fprintf(stderr, "Unknown VANC capture format: expected 39 rows\n");
return 1;
}
/* allocate a bitmap to hold it */
bitmap = bitmap_alloc(info->video_width, info->video_height, BITMAP_FORMAT_YUY16);
if (bitmap == NULL)
{
fprintf(stderr, "Out of memory allocating %dx%d bitmap\n", info->video_width, info->video_height);
return 1;
}
/* loop over frames */
for (frame = 0; frame < info->video_numsamples; frame++)
{
int field;
UINT8 bits[24];
/* read the frame */
avierr = avi_read_video_frame_yuy16(avi, frame, bitmap);
if (avierr != AVIERR_NONE)
{
fprintf(stderr, "Error reading AVI frame %d: %s\n", frame, avi_error_string(avierr));
break;
}
/* loop over two fields */
for (field = 0; field < 2; field++)
{
int prevwhite = white;
int i;
/* line 7 contains the white flag */
white = 0;
if (*BITMAP_ADDR16(bitmap, 20 * field + 7, bitmap->width / 2) > 0x8000)
white = 1;
/* output metadata for *previous* field */
if (frame > 0 || field > 0)
{
int flags = 0;
if (!prevwhite) flags |= 0x01;
if (!white) flags |= 0x02;
output_meta(flags, prevwhite, line12, line13, line14, framenum, chapternum);
}
/* line 12 contains stop code and other interesting bits */
line12 = 0;
if (parse_line(bitmap, 20 * field + 12, 24, bits) == 24)
for (i = 0; i < 24; i++)
line12 = (line12 << 1) | bits[i];
/* line 13 and 14 contain frame/chapter/lead in/out encodings */
line13 = 0;
if (parse_line(bitmap, 20 * field + 13, 24, bits) == 24)
for (i = 0; i < 24; i++)
line13 = (line13 << 1) | bits[i];
line14 = 0;
if (parse_line(bitmap, 20 * field + 14, 24, bits) == 24)
for (i = 0; i < 24; i++)
line14 = (line14 << 1) | bits[i];
/* the two lines must match */
// if (line13 != 0 && line14 != 0 && line13 != line14)
// line13 = line14 = 0;
/* is this a frame number? */
if ((line13 & 0xf00000) == 0xf00000)
framenum = line13 & 0x7ffff;
if ((line13 & 0xf00fff) == 0x800ddd)
chapternum = (line13 >> 12) & 0x7f;
}
}
/* output metadata for *previous* field */
{
int flags = 0;
if (!white) flags |= 0x01;
output_meta(flags, white, line12, line13, line14, framenum, chapternum);
}
bitmap_free(bitmap);
return 0;
}
