int decompress_image(struct vpx_context *ctx, const uint8_t *in, int size, uint8_t *out[3], int outstride[3])
{
vpx_image_t *img;
int frame_sz = size;
vpx_codec_iter_t iter = NULL;
const uint8_t *frame = in;
int i = 0;
if (vpx_codec_decode(&ctx->codec, frame, frame_sz, NULL, 0)) {
codec_error(&ctx->codec, "vpx_codec_decode");
return -1;
}
img = vpx_codec_get_frame(&ctx->codec, &iter);
if (img == NULL) {
codec_error(&ctx->codec, "vpx_codec_get_frame");
return -1;
}
for (i = 0; i < 3; i++) {
out[i] = img->planes[i];
outstride[i] = img->stride[i];
}
ctx->pixfmt = img->fmt;
return 0;
}
bool WebmExporter::add_frame(const vpx_image* data)
{
auto result =
vpx_codec_encode(&_codec, data, _frame_index++, 1, 0,
_settings.quality <= 1 ? VPX_DL_BEST_QUALITY : VPX_DL_GOOD_QUALITY);
if (result != VPX_CODEC_OK) {
codec_error("couldn't encode frame");
return false;
}
vpx_codec_iter_t iter = nullptr;
const vpx_codec_cx_pkt_t* packet = nullptr;
bool found_packet = false;
while (packet = vpx_codec_get_cx_data(&_codec, &iter)) {
found_packet = true;
if (packet->kind != VPX_CODEC_CX_FRAME_PKT) {
continue;
}
auto timestamp_ns = 1000000000 * packet->data.frame.pts / _settings.fps;
bool result =
_segment.AddFrame((uint8_t*) packet->data.frame.buf, packet->data.frame.sz, _video_track,
timestamp_ns, packet->data.frame.flags & VPX_FRAME_IS_KEY);
if (!result) {
std::cerr << "couldn't add frame" << std::endl;
return false;
}
}
return found_packet;
};
WebmExporter::~WebmExporter()
{
if (_img) {
vpx_img_free(_img);
}
// Flush encoder.
while (add_frame(nullptr))
;
if (vpx_codec_destroy(&_codec)) {
codec_error("failed to destroy codec");
return;
}
if (!_segment.Finalize()) {
std::cerr << "couldn't finalise muxer segment" << std::endl;
return;
}
_writer.Close();
}
struct vpx_context *init_decoder(int width, int height, const char *colorspace)
{
int flags = 0;
int err = 0;
vpx_codec_iface_t *codec_iface = NULL;
struct vpx_context *ctx = malloc(sizeof(struct vpx_context));
if (ctx == NULL)
return NULL;
codec_iface = vpx_codec_vp8_dx();
memset(ctx, 0, sizeof(struct vpx_context));
err = vpx_codec_dec_init(&ctx->codec, codec_iface, NULL, flags);
if (err) {
codec_error(&ctx->codec, "vpx_codec_dec_init");
printf("vpx_codec_dec_init(..) failed with error %d\n", err);
free(ctx);
return NULL;
}
ctx->width = width;
ctx->height = height;
return ctx;
}
int compress_image(struct vpx_context *ctx, uint8_t *input[3], int input_stride[3], uint8_t **out, int *outsz)
{
struct vpx_image image;
const vpx_codec_cx_pkt_t *pkt;
vpx_codec_iter_t iter = NULL;
int frame_cnt = 0;
int flags = 0;
int i = 0;
/* Encoding */
memset(&image, 0, sizeof(struct vpx_image));
image.w = ctx->width;
image.h = ctx->height;
image.fmt = ctx->pixfmt;
image.planes[0] = input[0];
image.planes[1] = input[1];
image.planes[2] = input[2];
image.stride[0] = input_stride[0];
image.stride[1] = input_stride[1];
image.stride[2] = input_stride[2];
image.d_w = ctx->width;
image.d_h = ctx->height;
image.x_chroma_shift = 0;
image.y_chroma_shift = 0;
image.bps = 8;
i = vpx_codec_encode(&ctx->codec, &image, frame_cnt, 1, flags, VPX_DL_REALTIME);
if (i) {
codec_error(&ctx->codec, "vpx_codec_encode");
return i;
}
pkt = vpx_codec_get_cx_data(&ctx->codec, &iter);
if (pkt->kind != VPX_CODEC_CX_FRAME_PKT) {
return 1;
}
*out = pkt->data.frame.buf;
*outsz = pkt->data.frame.sz;
return 0;
}
struct vpx_context *init_encoder(int width, int height, const char *colorspace)
{
vpx_codec_enc_cfg_t cfg;
vpx_img_fmt_t vpx_colorspace;
struct vpx_context *ctx;
vpx_codec_iface_t *codec_iface;
vpx_colorspace = get_vpx_colorspace(colorspace);
if (vpx_colorspace<0)
return NULL;
codec_iface = vpx_codec_vp8_cx();
if (vpx_codec_enc_config_default(codec_iface, &cfg, 0))
return NULL;
cfg.rc_target_bitrate = width * height * cfg.rc_target_bitrate / cfg.g_w / cfg.g_h;
cfg.g_w = width;
cfg.g_h = height;
cfg.g_error_resilient = 0;
cfg.g_lag_in_frames = 0;
cfg.rc_dropframe_thresh = 0;
//cfg.rc_resize_allowed = 1;
ctx = malloc(sizeof(struct vpx_context));
if (ctx == NULL)
return NULL;
memset(ctx, 0, sizeof(struct vpx_context));
if (vpx_codec_enc_init(&ctx->codec, codec_iface, &cfg, 0)) {
codec_error(&ctx->codec, "vpx_codec_enc_init");
free(ctx);
return NULL;
}
ctx->width = width;
ctx->height = height;
ctx->pixfmt = vpx_colorspace;
return ctx;
}
WebmExporter::WebmExporter(const exporter_settings& settings)
: _success{false}, _settings(settings), _video_track{0}, _img{nullptr}, _frame_index{0}
{
if (!_writer.Open(settings.path.c_str())) {
std::cerr << "couldn't open " << settings.path << " for writing" << std::endl;
return;
}
if (!_segment.Init(&_writer)) {
std::cerr << "couldn't initialise muxer segment" << std::endl;
return;
}
_segment.set_mode(mkvmuxer::Segment::kFile);
_segment.OutputCues(true);
_segment.GetSegmentInfo()->set_writing_app("trance");
_video_track = _segment.AddVideoTrack(settings.width, settings.height, 0);
if (!_video_track) {
std::cerr << "couldn't add video track" << std::endl;
return;
}
auto video = (mkvmuxer::VideoTrack*) _segment.GetTrackByNumber(_video_track);
if (!video) {
std::cerr << "couldn't get video track" << std::endl;
return;
}
video->set_frame_rate(settings.fps);
_segment.GetCues()->set_output_block_number(true);
_segment.CuesTrack(_video_track);
// See http://www.webmproject.org/docs/encoder-parameters.
vpx_codec_enc_cfg_t cfg;
if (vpx_codec_enc_config_default(vpx_codec_vp8_cx(), &cfg, 0)) {
std::cerr << "couldn't get default codec config" << std::endl;
return;
}
auto area = _settings.width * _settings.height;
auto bitrate = (1 + 2 * (4 - _settings.quality)) * area / 1024;
cfg.g_w = _settings.width;
cfg.g_h = _settings.height;
cfg.g_timebase.num = 1;
cfg.g_timebase.den = _settings.fps;
cfg.g_lag_in_frames = 24;
cfg.g_threads = settings.threads;
cfg.kf_min_dist = 0;
cfg.kf_max_dist = 256;
cfg.rc_target_bitrate = bitrate;
if (vpx_codec_enc_init(&_codec, vpx_codec_vp8_cx(), &cfg, 0)) {
codec_error("couldn't initialise encoder");
return;
}
_img = vpx_img_alloc(nullptr, VPX_IMG_FMT_I420, _settings.width, _settings.height, 16);
if (!_img) {
std::cerr << "couldn't allocate image for encoding" << std::endl;
return;
}
_success = true;
}
