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From: James Almer <jamrial@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Subject: [FFmpeg-devel] [PATCH 1/2] avcodec/cbs: add ff_cbs_read_buf()
Date: Thu,  1 May 2025 22:44:13 -0300
Message-ID: <20250502014414.3404-1-jamrial@gmail.com> (raw)

To take a reference from an existing buffer outside of AVPackets.

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavcodec/cbs.c | 10 +++++++++-
 libavcodec/cbs.h | 11 +++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/libavcodec/cbs.c b/libavcodec/cbs.c
index c0f6c62d20..b26e3ea3de 100644
--- a/libavcodec/cbs.c
+++ b/libavcodec/cbs.c
@@ -261,7 +261,7 @@ static int cbs_fill_fragment_data(CodedBitstreamFragment *frag,
 
 static int cbs_read_data(CodedBitstreamContext *ctx,
                          CodedBitstreamFragment *frag,
-                         AVBufferRef *buf,
+                         const AVBufferRef *buf,
                          const uint8_t *data, size_t size,
                          int header)
 {
@@ -334,6 +334,14 @@ int CBS_FUNC(read)(CodedBitstreamContext *ctx,
     return cbs_read_data(ctx, frag, NULL,
                          data, size, 0);
 }
+
+int CBS_FUNC(read_buf)(CodedBitstreamContext *ctx,
+                       CodedBitstreamFragment *frag,
+                       const AVBufferRef *buf)
+{
+    return cbs_read_data(ctx, frag, buf,
+                         buf->data, buf->size, 0);
+}
 #endif
 
 #if CBS_WRITE
diff --git a/libavcodec/cbs.h b/libavcodec/cbs.h
index 47818d5c12..8b503fdcce 100644
--- a/libavcodec/cbs.h
+++ b/libavcodec/cbs.h
@@ -381,6 +381,17 @@ int CBS_FUNC(read)(CodedBitstreamContext *ctx,
                 CodedBitstreamFragment *frag,
                 const uint8_t *data, size_t size);
 
+/**
+ * Read a bitstream from a memory region into a fragment, then
+ * split into units and decompose.
+ *
+ * This acts identical to ff_cbs_read() with the addition of an
+ * AVBufferRef backing the data.
+ */
+int CBS_FUNC(read_buf)(CodedBitstreamContext *ctx,
+                       CodedBitstreamFragment *frag,
+                       const AVBufferRef *buf);
+
 
 /**
  * Write the content of the fragment to its own internal buffer.
-- 
2.49.0

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             reply	other threads:[~2025-05-02  1:44 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-05-02  1:44 James Almer [this message]
2025-05-02  1:44 ` [FFmpeg-devel] [PATCH 2/2] avcodec/apv_parser: use ff_cbs_read_buf() James Almer
2025-05-04 13:58 ` [FFmpeg-devel] [PATCH 1/2] avcodec/cbs: add ff_cbs_read_buf() James Almer

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