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/*
Copyright (C) 2019 Leo Tenenbaum
This file is part of AutoArt.
AutoArt is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
AutoArt is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with AutoArt. If not, see <https://www.gnu.org/licenses/>.
*/
/*
NOTE: AutoVideos requires Go 1.11 or newer (for temp file patterns).
*/
package autoart
import (
"fmt"
"github.com/pommicket/autoart/autoutils"
"image"
"image/color"
"image/png"
"io"
"io/ioutil"
"math/rand"
"os"
"os/exec"
)
func generateFrame(width int, height int, paletted bool, config Config,
pconfig PaletteConfig, palette []color.RGBA,
functions []autoutils.Function, time float64,
frameNumber int64, file *os.File) error { // NOTE: file is closed by this function
vars := []float64{0, 0, time}
var img image.Image
if paletted {
img = GenerateImagePaletteFrom(width, height, pconfig, functions, vars, palette)
} else {
img = GenerateImageFromFunctions(width, height, config, functions, vars)
}
if err := png.Encode(file, img); err != nil {
file.Close()
return err
}
return file.Close()
}
func generateVideo(width int, height int, paletted bool, config Config,
pconfig PaletteConfig, time float64,
framerate int, filename string, verbose bool) error {
var palette []color.RGBA
if paletted {
// Generate palette
palette = make([]color.RGBA, pconfig.NColors)
for i := range palette {
r := uint8(rand.Intn(256))
g := uint8(rand.Intn(256))
b := uint8(rand.Intn(256))
a := uint8(255)
if pconfig.Alpha {
a = uint8(rand.Intn(256))
}
palette[i] = color.RGBA{r, g, b, a}
}
}
if config.FunctionLength == 0 {
// 0 value of config shouldn't have empty functions
config.FunctionLength = defaultFunctionLength
}
var functionLength int
if paletted {
functionLength = pconfig.FunctionLength
} else {
functionLength = config.FunctionLength
}
var nfunctions int
if paletted {
nfunctions = pconfig.NColors
} else {
nfunctions = config.nFunctions()
}
functions := make([]autoutils.Function, nfunctions)
for i := range functions {
functions[i].Generate(3, functionLength)
}
frames := int64(time * float64(framerate))
files := make([]*os.File, frames)
defer func() {
// Delete all temporary files
for _, file := range files {
if file != nil {
os.Remove(file.Name())
}
}
}()
// Create temporary frame files
for i := range files {
var err error
files[i], err = ioutil.TempFile("", "frame*.png")
if err != nil {
return err
}
}
autoutils.RunInBatches(frames, "Generating video...", func(n int64, errs chan<- error) {
t := float64(n) / float64(framerate)
errs <- generateFrame(width, height, paletted, config, pconfig, palette, functions, t, n, files[n])
})
ffmpegInputFile, err := ioutil.TempFile("", "input*.txt")
if err != nil {
return err
}
defer os.Remove(ffmpegInputFile.Name())
for _, file := range files {
name := file.Name()
info := fmt.Sprintf("file '%v'\nduration %v\n", name, 1/float64(framerate))
if _, err = io.WriteString(ffmpegInputFile, info); err != nil {
return err
}
}
fmt.Println(ffmpegInputFile.Name())
if err = ffmpegInputFile.Close(); err != nil {
return err
}
if verbose {
fmt.Println("ffmpeg", "-y", "-f", "concat", "-safe", "0", "-i", ffmpegInputFile.Name(), filename)
}
cmd := exec.Command("ffmpeg", "-y", "-f", "concat", "-safe", "0", "-i", ffmpegInputFile.Name(), filename)
if verbose {
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
}
if err = cmd.Run(); err != nil {
return fmt.Errorf("ffmpeg failed: %v", err)
}
return nil
}
func GenerateVideo(width int, height int, config Config, time float64,
framerate int, filename string, verbose bool) error {
var pconfig PaletteConfig
return generateVideo(width, height, false, config, pconfig, time, framerate, filename, verbose)
}
func GenerateVideoPalette(width int, height int, pconfig PaletteConfig,
time float64, framerate int, filename string, verbose bool) error {
var config Config
return generateVideo(width, height, true, config, pconfig, time, framerate, filename, verbose)
}
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