Remove Seek requirement for some writers (#743)

Author: Yesterday17

media/src/io/h264_writer/mod.rs

@@ -1,7 +1,7 @@
 #[cfg(test)]
 mod h264_writer_test;
 
-use std::io::{Seek, Write};
+use std::io::Write;
 
 use rtp::codecs::h264::H264Packet;
 use rtp::packetizer::Depacketizer;
@@ -29,13 +29,13 @@ fn is_key_frame(data: &[u8]) -> bool {
 /// Currently it only supports non-interleaved mode
 /// Therefore, only 1-23, 24 (STAP-A), 28 (FU-A) NAL types are allowed.
 /// <https://tools.ietf.org/html/rfc6184#section-5.2>
-pub struct H264Writer<W: Write + Seek> {
+pub struct H264Writer<W: Write> {
     writer: W,
     has_key_frame: bool,
     cached_packet: Option<H264Packet>,
 }
 
-impl<W: Write + Seek> H264Writer<W> {
+impl<W: Write> H264Writer<W> {
     // new initializes a new H264 writer with an io.Writer output
     pub fn new(writer: W) -> Self {
         H264Writer {
@@ -46,7 +46,7 @@ impl<W: Write + Seek> H264Writer<W> {
     }
 }
 
-impl<W: Write + Seek> Writer for H264Writer<W> {
+impl<W: Write> Writer for H264Writer<W> {
     /// write_rtp adds a new packet and writes the appropriate headers for it
     fn write_rtp(&mut self, packet: &rtp::packet::Packet) -> Result<()> {
         if packet.payload.is_empty() {

media/src/io/ogg_writer/mod.rs

@@ -1,7 +1,7 @@
 #[cfg(test)]
 mod ogg_writer_test;
 
-use std::io::{BufWriter, Seek, Write};
+use std::io::{BufWriter, Write};
 
 use byteorder::{LittleEndian, WriteBytesExt};
 use bytes::Bytes;
@@ -12,7 +12,7 @@ use crate::io::ogg_reader::*;
 use crate::io::Writer;
 
 /// OggWriter is used to take RTP packets and write them to an OGG on disk
-pub struct OggWriter<W: Write + Seek> {
+pub struct OggWriter<W: Write> {
     writer: W,
     sample_rate: u32,
     channel_count: u8,
@@ -25,7 +25,7 @@ pub struct OggWriter<W: Write + Seek> {
     last_payload: Bytes,
 }
 
-impl<W: Write + Seek> OggWriter<W> {
+impl<W: Write> OggWriter<W> {
     /// new initialize a new OGG Opus writer with an io.Writer output
     pub fn new(writer: W, sample_rate: u32, channel_count: u8) -> Result<Self> {
         let mut w = OggWriter {
@@ -166,7 +166,7 @@ impl<W: Write + Seek> OggWriter<W> {
     }
 }
 
-impl<W: Write + Seek> Writer for OggWriter<W> {
+impl<W: Write> Writer for OggWriter<W> {
     /// write_rtp adds a new packet and writes the appropriate headers for it
     fn write_rtp(&mut self, packet: &rtp::packet::Packet) -> Result<()> {
         if packet.payload.is_empty() {