/* Return 0 if successful.
* Return 1 if the same frame was requested at the last call.
* Return a negative value otherwise. */
int libavsmash_video_get_frame
(
libavsmash_video_decode_handler_t *vdhp,
libavsmash_video_output_handler_t *vohp,
uint32_t sample_number
)
{
if( vohp->vfr2cfr )
{
sample_number = libavsmash_vfr2cfr( vdhp, vohp, sample_number );
if( sample_number == 0 )
return -1;
}
if( sample_number == vdhp->last_sample_number )
return 1;
int ret;
if( (ret = get_requested_picture( vdhp, vdhp->frame_buffer, sample_number )) < 0
|| (ret = update_scaler_configuration_if_needed( &vohp->scaler, &vdhp->config.lh, vdhp->frame_buffer )) < 0 )
return ret;
return 0;
}
int lwlibav_get_video_frame
(
lwlibav_video_decode_handler_t *vdhp,
lwlibav_video_output_handler_t *vohp,
uint32_t frame_number
)
{
if( !vohp->repeat_control )
return get_requested_picture( vdhp, vdhp->frame_buffer, frame_number );
/* Get picture to applied the repeat control. */
uint32_t t = vohp->frame_order_list[frame_number].top;
uint32_t b = vohp->frame_order_list[frame_number].bottom;
uint32_t first_field_number = MIN( t, b );
uint32_t second_field_number = MAX( t, b );
/* Check repeat targets and cache datas. */
enum
{
REPEAT_CONTROL_COPIED_FROM_CACHE = 0x00,
REPEAT_CONTROL_DECODE_TOP_FIELD = 0x01,
REPEAT_CONTROL_DECODE_BOTTOM_FIELD = 0x02,
REPEAT_CONTROL_DECODE_BOTH_FIELDS = 0x03, /* REPEAT_CONTROL_DECODE_TOP_FIELD | REPEAT_CONTROL_DECODE_BOTTOM_FIELD */
REPEAT_CONTROL_DECODE_ONE_FRAME = 0x04
};
int repeat_control;
if( first_field_number == second_field_number )
{
repeat_control = REPEAT_CONTROL_DECODE_ONE_FRAME;
if( first_field_number == vohp->frame_cache_numbers[0] )
return copy_frame( &vdhp->lh, vdhp->frame_buffer, vohp->frame_cache_buffers[0] );
if( first_field_number == vohp->frame_cache_numbers[1] )
return copy_frame( &vdhp->lh, vdhp->frame_buffer, vohp->frame_cache_buffers[1] );
if( first_field_number != vohp->frame_order_list[frame_number - 1].top
&& first_field_number != vohp->frame_order_list[frame_number - 1].bottom
&& first_field_number != vohp->frame_order_list[frame_number + 1].top
&& first_field_number != vohp->frame_order_list[frame_number + 1].bottom )
{
if( get_requested_picture( vdhp, vdhp->frame_buffer, first_field_number ) < 0 )
return -1;
/* Treat this frame as interlaced. */
vdhp->frame_buffer->interlaced_frame = 1;
return 0;
}
}
else
{
repeat_control = REPEAT_CONTROL_DECODE_BOTH_FIELDS;
for( int i = 0; i < REPEAT_CONTROL_CACHE_NUM; i++ )
{
if( t == vohp->frame_cache_numbers[i] )
{
if( copy_field( &vdhp->lh, vdhp->frame_buffer, vohp->frame_cache_buffers[i], 0 ) < 0 )
return -1;
repeat_control &= ~REPEAT_CONTROL_DECODE_TOP_FIELD;
}
if( b == vohp->frame_cache_numbers[i] )
{
if( copy_field( &vdhp->lh, vdhp->frame_buffer, vohp->frame_cache_buffers[i], 1 ) < 0 )
return -1;
repeat_control &= ~REPEAT_CONTROL_DECODE_BOTTOM_FIELD;
}
}
if( repeat_control == REPEAT_CONTROL_COPIED_FROM_CACHE )
return 0;
}
/* Decode target frames and copy to output buffer. */
if( repeat_control == REPEAT_CONTROL_DECODE_BOTH_FIELDS )
{
/* Decode 2 frames, and copy each a top and bottom fields. */
if( get_requested_picture( vdhp, vohp->frame_cache_buffers[0], first_field_number ) < 0 )
return -1;
vohp->frame_cache_numbers[0] = first_field_number;
if( get_requested_picture( vdhp, vohp->frame_cache_buffers[1], second_field_number ) < 0 )
return -1;
vohp->frame_cache_numbers[1] = second_field_number;
if( check_frame_buffer_identical( vohp->frame_cache_buffers[0], vohp->frame_cache_buffers[1] ) )
return copy_frame( &vdhp->lh, vdhp->frame_buffer, vohp->frame_cache_buffers[0] );
if( copy_field( &vdhp->lh, vdhp->frame_buffer, vohp->frame_cache_buffers[0], t > b ? 1 : 0 ) < 0
|| copy_field( &vdhp->lh, vdhp->frame_buffer, vohp->frame_cache_buffers[1], t < b ? 1 : 0 ) < 0 )
return -1;
return 0;
}
else
{
/* Decode 1 frame, and copy 1 frame or 1 field. */
int decode_number = repeat_control == REPEAT_CONTROL_DECODE_ONE_FRAME ? first_field_number
: repeat_control == REPEAT_CONTROL_DECODE_TOP_FIELD ? t : b;
int idx = vohp->frame_cache_numbers[0] > vohp->frame_cache_numbers[1] ? 1 : 0;
if( get_requested_picture( vdhp, vohp->frame_cache_buffers[idx], decode_number ) < 0 )
return -1;
vohp->frame_cache_numbers[idx] = decode_number;
if( repeat_control == REPEAT_CONTROL_DECODE_ONE_FRAME )
return copy_frame( &vdhp->lh, vdhp->frame_buffer, vohp->frame_cache_buffers[idx] );
else
return copy_field( &vdhp->lh, vdhp->frame_buffer, vohp->frame_cache_buffers[idx],
repeat_control == REPEAT_CONTROL_DECODE_TOP_FIELD ? 0 : 1 );
}
}
