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/**
* @file swscale.c Video filter for scaling and pixel conversion
*
* Copyright (C) 2010 - 2016 Creytiv.com
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include <libswscale/swscale.h>
struct swscale_enc {
struct vidfilt_enc_st vf; /**< Inheritance */
struct SwsContext *sws;
struct vidframe *frame;
struct vidsz dst_size;
};
static enum vidfmt swscale_format = VID_FMT_YUV420P; /* XXX: configurable */
static enum AVPixelFormat vidfmt_to_avpixfmt(enum vidfmt fmt)
{
switch (fmt) {
case VID_FMT_YUV420P: return AV_PIX_FMT_YUV420P;
case VID_FMT_YUV444P: return AV_PIX_FMT_YUV444P;
case VID_FMT_NV12: return AV_PIX_FMT_NV12;
case VID_FMT_NV21: return AV_PIX_FMT_NV21;
default: return AV_PIX_FMT_NONE;
}
}
static void encode_destructor(void *arg)
{
struct swscale_enc *st = arg;
list_unlink(&st->vf.le);
mem_deref(st->frame);
sws_freeContext(st->sws);
}
static int encode_update(struct vidfilt_enc_st **stp, void **ctx,
const struct vidfilt *vf)
{
struct swscale_enc *st;
struct config *config = conf_config();
int err = 0;
if (!config) {
warning("swscale: no config\n");
return EINVAL;
}
if (!stp || !ctx || !vf)
return EINVAL;
if (*stp)
return 0;
st = mem_zalloc(sizeof(*st), encode_destructor);
if (!st)
return ENOMEM;
st->dst_size.w = config->video.width;
st->dst_size.h = config->video.height;
if (err)
mem_deref(st);
else
*stp = (struct vidfilt_enc_st *)st;
return err;
}
static int encode_process(struct vidfilt_enc_st *st, struct vidframe *frame)
{
struct swscale_enc *enc = (struct swscale_enc *)st;
enum AVPixelFormat avpixfmt, avpixfmt_dst;
const uint8_t *srcSlice[4];
uint8_t *dst[4];
int srcStride[4], dstStride[4];
int width, height, i, h;
int err = 0;
if (!st)
return EINVAL;
if (!frame)
return 0;
width = frame->size.w;
height = frame->size.h;
avpixfmt = vidfmt_to_avpixfmt(frame->fmt);
if (avpixfmt == AV_PIX_FMT_NONE) {
warning("swscale: unknown pixel-format (%s)\n",
vidfmt_name(frame->fmt));
return EINVAL;
}
avpixfmt_dst = vidfmt_to_avpixfmt(swscale_format);
if (avpixfmt_dst == AV_PIX_FMT_NONE) {
warning("swscale: unknown pixel-format (%s)\n",
vidfmt_name(swscale_format));
return EINVAL;
}
if (!enc->sws) {
struct SwsContext *sws;
int flags = 0;
sws = sws_getContext(width, height, avpixfmt,
enc->dst_size.w, enc->dst_size.h,
avpixfmt_dst,
flags, NULL, NULL, NULL);
if (!sws) {
warning("swscale: sws_getContext error\n");
return ENOMEM;
}
enc->sws = sws;
info("swscale: created SwsContext:"
" `%s' %d x %d --> `%s' %u x %u\n",
vidfmt_name(frame->fmt), width, height,
vidfmt_name(swscale_format),
enc->dst_size.w, enc->dst_size.h);
}
if (!enc->frame) {
err = vidframe_alloc(&enc->frame, swscale_format,
&enc->dst_size);
if (err) {
warning("swscale: vidframe_alloc error (%m)\n", err);
return err;
}
}
for (i=0; i<4; i++) {
srcSlice[i] = frame->data[i];
srcStride[i] = frame->linesize[i];
dst[i] = enc->frame->data[i];
dstStride[i] = enc->frame->linesize[i];
}
h = sws_scale(enc->sws, srcSlice, srcStride,
0, height, dst, dstStride);
if (h <= 0) {
warning("swscale: sws_scale error (%d)\n", h);
return EPROTO;
}
/* Copy the converted frame back to the input frame */
for (i=0; i<4; i++) {
frame->data[i] = enc->frame->data[i];
frame->linesize[i] = enc->frame->linesize[i];
}
frame->size = enc->frame->size;
frame->fmt = enc->frame->fmt;
return 0;
}
static struct vidfilt vf_swscale = {
LE_INIT, "swscale", encode_update, encode_process, NULL, NULL
};
static int module_init(void)
{
vidfilt_register(baresip_vidfiltl(), &vf_swscale);
return 0;
}
static int module_close(void)
{
vidfilt_unregister(&vf_swscale);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(swscale) = {
"swscale",
"vidfilt",
module_init,
module_close
};
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