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#include "hb.h"
#include "hbffmpeg.h"
struct hb_work_private_s
{
AVCodecContext * context;
hb_job_t * job;
// For PGS subs, when doing passthru, we don't know if we need a
// packet until we have processed several packets. So we cache
// all the packets we see until libav returns a subtitle with
// the information we need.
hb_buffer_t * list_pass_buffer;
hb_buffer_t * last_pass_buffer;
// It is possible for multiple subtitles to be enncapsulated in
// one packet. This won't happen for PGS subs, but may for other
// types of subtitles. Since I plan to generalize this code to handle
// other than PGS, we will need to keep a list of all subtitles seen
// while parsing an input packet.
hb_buffer_t * list_buffer;
hb_buffer_t * last_buffer;
};
static int decsubInit( hb_work_object_t * w, hb_job_t * job )
{
AVCodec *codec = avcodec_find_decoder( CODEC_ID_HDMV_PGS_SUBTITLE );
AVCodecContext *context = avcodec_alloc_context3( codec );
context->codec = codec;
hb_work_private_t * pv;
pv = calloc( 1, sizeof( hb_work_private_t ) );
w->private_data = pv;
pv->context = context;
pv->job = job;
return 0;
}
static int decsubWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out )
{
hb_work_private_t * pv = w->private_data;
hb_buffer_t * in = *buf_in;
if ( in->size <= 0 )
{
/* EOF on input stream - send it downstream & say that we're done */
if ( pv->list_buffer == NULL )
{
pv->list_buffer = pv->last_buffer = in;
}
else
{
pv->last_buffer->next = in;
}
*buf_in = NULL;
*buf_out = pv->list_buffer;
pv->list_buffer = NULL;
return HB_WORK_DONE;
}
if ( !pv->job->indepth_scan &&
w->subtitle->config.dest == PASSTHRUSUB &&
hb_subtitle_can_pass( PGSSUB, pv->job->mux ) )
{
// Append to buffer list. It will be sent to fifo after we determine
// if this is a packet we need.
if ( pv->list_pass_buffer == NULL )
{
pv->list_pass_buffer = pv->last_pass_buffer = in;
}
else
{
pv->last_pass_buffer->next = in;
pv->last_pass_buffer = in;
}
// We are keeping the buffer, so prevent the filter loop from
// deleting it.
*buf_in = NULL;
}
AVSubtitle subtitle;
memset( &subtitle, 0, sizeof(subtitle) );
AVPacket avp;
av_init_packet( &avp );
avp.data = in->data;
avp.size = in->size;
// libav wants pkt pts in AV_TIME_BASE units
avp.pts = av_rescale(in->s.start, AV_TIME_BASE, 90000);
int has_subtitle = 0;
do
{
int usedBytes = avcodec_decode_subtitle2( pv->context, &subtitle, &has_subtitle, &avp );
if (usedBytes < 0)
{
hb_log("unable to decode subtitle with %d bytes.", avp.size);
return HB_WORK_OK;
}
if (usedBytes <= avp.size)
{
avp.data += usedBytes;
avp.size -= usedBytes;
}
else
{
avp.size = 0;
}
if (has_subtitle && subtitle.num_rects > 0)
{
w->subtitle->hits++;
if (subtitle.forced)
w->subtitle->forced_hits++;
}
// The sub is "usable" if:
// 1. libav returned a sub AND
// 2. we are not scanning for foreign audio subs AND
// 3. we want all subs (e.g. not forced) OR
// 4. the sub is forced and we only want forced OR
// 5. subtitle clears the previous sub (these are never forced)
// subtitle.num_rects == 0
uint8_t useable_sub = has_subtitle && !pv->job->indepth_scan &&
( !subtitle.num_rects || !w->subtitle->config.force ||
( w->subtitle->config.force && subtitle.forced ) );
if (useable_sub)
{
int64_t pts = av_rescale(subtitle.pts, 90000, AV_TIME_BASE);
hb_buffer_t * out = NULL;
if ( w->subtitle->config.dest == PASSTHRUSUB &&
hb_subtitle_can_pass( PGSSUB, pv->job->mux ) )
{
out = pv->list_pass_buffer;
pv->list_pass_buffer = NULL;
}
else
{
if (subtitle.num_rects != 0)
{
unsigned ii;
for (ii = 0; ii < subtitle.num_rects; ii++)
{
AVSubtitleRect *rect = subtitle.rects[ii];
out = hb_frame_buffer_init(
PIX_FMT_YUVA420P, rect->w, rect->h );
out->s.id = in->s.id;
out->sequence = in->sequence;
out->s.start = pts;
out->s.stop = 0;
out->f.x = rect->x;
out->f.y = rect->y;
uint8_t *lum = out->plane[0].data;
uint8_t *chromaU = out->plane[1].data;
uint8_t *chromaV = out->plane[2].data;
uint8_t *alpha = out->plane[3].data;
int xx, yy;
for (yy = 0; yy < rect->h; yy++)
{
for (xx = 0; xx < rect->w; xx++)
{
uint32_t argb, yuv;
int pixel;
uint8_t color;
pixel = yy * rect->w + xx;
color = rect->pict.data[0][pixel];
argb = ((uint32_t*)rect->pict.data[1])[color];
yuv = hb_rgb2yuv(argb);
lum[xx] = (yuv >> 16) & 0xff;
alpha[xx] = (argb >> 24) & 0xff;
if ((xx & 1) == 0 && (yy & 1) == 0)
{
chromaV[xx>>1] = (yuv >> 8) & 0xff;
chromaU[xx>>1] = yuv & 0xff;
}
}
lum += out->plane[0].stride;
if ((yy & 1) == 0)
{
chromaU += out->plane[1].stride;
chromaV += out->plane[2].stride;
}
alpha += out->plane[3].stride;
}
if ( pv->list_buffer == NULL )
{
pv->list_buffer = pv->last_buffer = out;
}
else
{
pv->last_buffer->next = out;
pv->last_buffer = out;
}
out = NULL;
}
}
else
{
out = hb_buffer_init( 1 );
out->s.id = in->s.id;
out->s.start = pts;
out->s.stop = 0;
out->f.x = 0;
out->f.y = 0;
out->f.width = 0;
out->f.height = 0;
}
}
if ( pv->list_buffer == NULL )
{
pv->list_buffer = pv->last_buffer = out;
}
else
{
pv->last_buffer->next = out;
}
while (pv->last_buffer && pv->last_buffer->next)
{
pv->last_buffer = pv->last_buffer->next;
}
}
else if ( has_subtitle )
{
hb_buffer_close( &pv->list_pass_buffer );
pv->list_pass_buffer = NULL;
}
if ( has_subtitle )
{
avsubtitle_free(&subtitle);
}
} while (avp.size > 0);
*buf_out = pv->list_buffer;
pv->list_buffer = NULL;
return HB_WORK_OK;
}
static void decsubClose( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
avcodec_flush_buffers( pv->context );
avcodec_close( pv->context );
}
hb_work_object_t hb_decpgssub =
{
WORK_DECPGSSUB,
"PGS decoder",
decsubInit,
decsubWork,
decsubClose
};
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