cli/internal/ffmpeg/options.go

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package ffmpeg
import (
"context"
"os/exec"
"strings"
)
type ffmpegBuilder struct {
binary string // ffmpeg binary path
options map[string]string // global options
inputs []*inputBuilder // input options
outputs []*outputBuilder // output options
}
func newFFmpegBuilder() *ffmpegBuilder {
return &ffmpegBuilder{
binary: "ffmpeg",
options: make(map[string]string),
}
}
func (b *ffmpegBuilder) AddInput(src *inputBuilder) {
b.inputs = append(b.inputs, src)
}
func (b *ffmpegBuilder) AddOutput(dst *outputBuilder) {
b.outputs = append(b.outputs, dst)
}
func (b *ffmpegBuilder) SetBinary(bin string) {
b.binary = bin
}
func (b *ffmpegBuilder) SetFlag(flag string) {
b.options[flag] = ""
}
func (b *ffmpegBuilder) SetOption(name, value string) {
b.options[name] = value
}
func (b *ffmpegBuilder) Args() (args []string) {
for name, val := range b.options {
args = append(args, "-"+name)
if val != "" {
args = append(args, val)
}
}
for _, input := range b.inputs {
args = append(args, input.Args()...)
}
for _, output := range b.outputs {
args = append(args, output.Args()...)
}
return
}
func (b *ffmpegBuilder) Command(ctx context.Context) *exec.Cmd {
bin := "ffmpeg"
if b.binary != "" {
bin = b.binary
}
return exec.CommandContext(ctx, bin, b.Args()...)
}
// inputBuilder is the builder for ffmpeg input options
type inputBuilder struct {
path string
options map[string][]string
}
func newInputBuilder(path string) *inputBuilder {
return &inputBuilder{
path: path,
options: make(map[string][]string),
}
}
func (b *inputBuilder) AddOption(name, value string) {
b.options[name] = append(b.options[name], value)
}
func (b *inputBuilder) Args() (args []string) {
for name, values := range b.options {
for _, val := range values {
args = append(args, "-"+name, val)
}
}
return append(args, "-i", b.path)
}
// outputBuilder is the builder for ffmpeg output options
type outputBuilder struct {
path string
options map[string][]string
}
func newOutputBuilder(path string) *outputBuilder {
return &outputBuilder{
path: path,
options: make(map[string][]string),
}
}
func (b *outputBuilder) AddOption(name, value string) {
b.options[name] = append(b.options[name], value)
}
func (b *outputBuilder) Args() (args []string) {
for name, values := range b.options {
for _, val := range values {
args = append(args, "-"+name, val)
}
}
return append(args, b.path)
}
// AddMetadata is the shortcut for adding "metadata" option
func (b *outputBuilder) AddMetadata(stream, key, value string) {
optVal := strings.TrimSpace(key) + "=" + strings.TrimSpace(value)
if stream != "" {
b.AddOption("metadata:"+stream, optVal)
} else {
b.AddOption("metadata", optVal)
}
}