avcodec/cbs: Factor out common code for writing units

All cbs-functions to write units share a common pattern:
1. They check whether they have a write buffer (that is used to store
the unit's data until the needed size becomes known after writing the
unit when a dedicated buffer will be allocated).
2. They use this buffer for a PutBitContext.
3. The (codec-specific) writing takes place through the PutBitContext.
4. The return value is checked. AVERROR(ENOSPC) here always indicates
that the buffer was too small and leads to a reallocation of said
buffer.
5. The final buffer will be allocated and the data copied.

This commit factors this common code out in a single function in cbs.c.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/libavcodec/cbs_h2645.h b/libavcodec/cbs_h2645.h
index f4cf65bdde..f4c987a511 100644
--- a/libavcodec/cbs_h2645.h
+++ b/libavcodec/cbs_h2645.h
@@ -19,9 +19,6 @@
 #ifndef AVCODEC_CBS_H2645_H
 #define AVCODEC_CBS_H2645_H
 
-#include <stddef.h>
-#include <stdint.h>
-
 #include "h2645_parse.h"
 
 
@@ -33,10 +30,6 @@ typedef struct CodedBitstreamH2645Context {
     int nal_length_size;
     // Packet reader.
     H2645Packet read_packet;
-
-    // Write buffer
-    uint8_t *write_buffer;
-    size_t write_buffer_size;
 } CodedBitstreamH2645Context;