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use nihav_core::muxers::*;
struct GIFMuxer<'a> {
bw: &'a mut ByteWriter<'a>,
single: bool,
gif87: bool,
pal_written: bool,
nloops: u16,
}
impl<'a> GIFMuxer<'a> {
fn new(bw: &'a mut ByteWriter<'a>) -> Self {
Self {
bw,
single: false,
gif87: false,
pal_written: false,
nloops: 0,
}
}
fn write_pal(&mut self, pal: &[u8; 1024]) -> MuxerResult<()> {
let mut nclr = 256;
for quad in pal.chunks_exact(4).rev() {
if quad[0] == 0 && quad[1] == 0 && quad[2] == 0 {
nclr -= 1;
} else {
break;
}
}
let mut pal_bits = 1;
while (1 << pal_bits) < nclr {
pal_bits += 1;
}
self.bw.write_byte(0xF0 | (pal_bits - 1))?;
self.bw.write_byte(0)?; // background colour index
self.bw.write_byte(0)?; // aspect ratio
for quad in pal.chunks_exact(4).take(1 << pal_bits) {
self.bw.write_buf(&quad[..3])?;
}
Ok(())
}
}
impl<'a> MuxCore<'a> for GIFMuxer<'a> {
fn create(&mut self, strmgr: &StreamManager) -> MuxerResult<()> {
if strmgr.get_num_streams() != 1 {
return Err(MuxerError::InvalidArgument);
}
let vstr = strmgr.get_stream(0).unwrap();
if vstr.get_media_type() != StreamType::Video {
return Err(MuxerError::UnsupportedFormat);
}
let info = vstr.get_info();
let vinfo = info.get_properties().get_video_info().unwrap();
if vinfo.width > 65535 || vinfo.height > 65535 || !vinfo.format.palette {
return Err(MuxerError::UnsupportedFormat);
}
if self.gif87 {
self.single = true;
self.bw.write_buf(b"GIF87a")?;
} else {
self.bw.write_buf(b"GIF89a")?;
}
self.bw.write_u16le(vinfo.width as u16)?;
self.bw.write_u16le(vinfo.height as u16)?;
Ok(())
}
fn mux_frame(&mut self, strmgr: &StreamManager, pkt: NAPacket) -> MuxerResult<()> {
if self.bw.tell() == 0 {
return Err(MuxerError::NotCreated);
}
if !self.pal_written {
let info = strmgr.get_stream(0).unwrap().get_info();
let mut tr_idx = None;
if let Some(ref edata) = info.get_extradata() {
if edata.len() == 1 {
tr_idx = Some(edata[0]);
} else if edata.len() >= 3 {
self.bw.write_buf(edata)?;
self.pal_written = true;
}
}
if !self.pal_written {
let mut pal_found = false;
for sdata in pkt.side_data.iter() {
if let NASideData::Palette(_, ref pal) = sdata {
self.write_pal(pal,)?;
pal_found = true;
break;
}
}
if !pal_found {
return Err(MuxerError::InvalidArgument);
}
}
self.pal_written = true;
if !self.single {
let vstr = strmgr.get_stream(0).unwrap();
let delay = NATimeInfo::ts_to_time(1, 100, vstr.tb_num, vstr.tb_den) as u16;
self.bw.write_byte(0x21)?; // graphic control
self.bw.write_byte(0xF9)?; // graphic control extension
self.bw.write_byte(4)?; // block size
self.bw.write_byte(if tr_idx.is_some() { 1 } else { 0 })?; // flags
self.bw.write_u16le(delay)?;
self.bw.write_byte(tr_idx.unwrap_or(0))?; // transparent colour index
self.bw.write_byte(0x00)?; // block terminator
self.bw.write_byte(0x21)?; // graphic control
self.bw.write_byte(0xFF)?; // application extension
let app_id = b"NETSCAPE2.0";
self.bw.write_byte(app_id.len() as u8)?;
self.bw.write_buf(app_id)?;
self.bw.write_byte(3)?; // application data block length
self.bw.write_byte(0x01)?;
self.bw.write_u16le(self.nloops)?;
self.bw.write_byte(0x00)?; // block terminator
}
} else if self.single { // just one frame is expected
return Err(MuxerError::InvalidArgument);
}
// buffer is supposed to have all the data starting from image descriptor
let src = pkt.get_buffer();
self.bw.write_buf(&src)?;
Ok(())
}
fn flush(&mut self) -> MuxerResult<()> {
Ok(())
}
fn end(&mut self) -> MuxerResult<()> {
self.bw.write_byte(0x3B)?; // GIF terminator
Ok(())
}
}
const MUXER_OPTS: &[NAOptionDefinition] = &[
NAOptionDefinition {
name: "gif87", description: "Create GIF87 image",
opt_type: NAOptionDefinitionType::Bool },
NAOptionDefinition {
name: "single", description: "Create single image",
opt_type: NAOptionDefinitionType::Bool },
NAOptionDefinition {
name: "loops", description: "Number of times to loop the animation",
opt_type: NAOptionDefinitionType::Int(Some(0), Some(65535)) },
];
impl<'a> NAOptionHandler for GIFMuxer<'a> {
fn get_supported_options(&self) -> &[NAOptionDefinition] { MUXER_OPTS }
fn set_options(&mut self, options: &[NAOption]) {
for option in options.iter() {
for opt_def in MUXER_OPTS.iter() {
if opt_def.check(option).is_ok() {
match option.name {
"gif87" => {
if let NAValue::Bool(bval) = option.value {
self.gif87 = bval;
}
},
"single" => {
if let NAValue::Bool(bval) = option.value {
self.single = bval;
}
},
"loops" => {
if let NAValue::Int(ival) = option.value {
self.nloops = ival as u16;
}
},
_ => {},
};
}
}
}
}
fn query_option_value(&self, name: &str) -> Option<NAValue> {
match name {
"gif87" => Some(NAValue::Bool(self.gif87)),
"single" => Some(NAValue::Bool(self.single)),
"loops" => Some(NAValue::Int(i64::from(self.nloops))),
_ => None,
}
}
}
pub struct GIFMuxerCreator {}
impl MuxerCreator for GIFMuxerCreator {
fn new_muxer<'a>(&self, bw: &'a mut ByteWriter<'a>) -> Box<dyn MuxCore<'a> + 'a> {
Box::new(GIFMuxer::new(bw))
}
fn get_name(&self) -> &'static str { "gif" }
fn get_capabilities(&self) -> MuxerCapabilities { MuxerCapabilities::SingleVideo("gif") }
}
#[cfg(test)]
mod test {
use nihav_core::codecs::*;
use nihav_core::demuxers::*;
use nihav_core::muxers::*;
use nihav_codec_support::test::enc_video::*;
use crate::*;
#[test]
fn test_gif_muxer() {
let mut dmx_reg = RegisteredDemuxers::new();
generic_register_all_demuxers(&mut dmx_reg);
// sample: https://samples.mplayerhq.hu/image-samples/GIF/3D.gif
let dec_config = DecoderTestParams {
demuxer: "gif",
in_name: "assets/Misc/3D.gif",
limit: None,
stream_type: StreamType::None,
dmx_reg, dec_reg: RegisteredDecoders::new(),
};
let mut mux_reg = RegisteredMuxers::new();
generic_register_all_muxers(&mut mux_reg);
/*let enc_config = EncoderTestParams {
muxer: "gif",
enc_name: "",
out_name: "muxed.gif",
mux_reg, enc_reg: RegisteredEncoders::new(),
};
test_remuxing(&dec_config, &enc_config);*/
test_remuxing_md5(&dec_config, "gif", &mux_reg,
[0x7192b724, 0x2bc4fd05, 0xaa65f268, 0x3929e8bf]);
}
}
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