[FFmpeg-devel] [PATCH] libavcodec/adts_header: add frame_length field and avpriv function to parse AAC ADTS header

[Nachiket Tarate]

@James Almer <jamrial at gmail.com>

Kindly merge this patch if it looks fine.


--
Thanks & Regards,
Nachiket Tarate

________________________________
From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> on behalf of Nachiket Tarate <nachiket.tarate at outlook.com>
Sent: Thursday, October 8, 2020 8:02 PM
To: ffmpeg-devel at ffmpeg.org <ffmpeg-devel at ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH] libavcodec/adts_header: add frame_length field and avpriv function to parse AAC ADTS header

These will be used by HLS demuxer in case of SAMPLE-AES encryption.

Signed-off-by: Nachiket Tarate <nachiket.tarate at outlook.com>
---
 libavcodec/adts_header.c |  1 +
 libavcodec/adts_header.h |  1 +
 libavcodec/adts_parser.c | 29 ++++++++++++++++++++++++++++-
 libavcodec/adts_parser.h |  4 ++++
 4 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/libavcodec/adts_header.c b/libavcodec/adts_header.c
index 0889820f8a..c6680b0fc8 100644
--- a/libavcodec/adts_header.c
+++ b/libavcodec/adts_header.c
@@ -66,6 +66,7 @@ int ff_adts_header_parse(GetBitContext *gbc, AACADTSHeaderInfo *hdr)
     hdr->sample_rate    = avpriv_mpeg4audio_sample_rates[sr];
     hdr->samples        = (rdb + 1) * 1024;
     hdr->bit_rate       = size * 8 * hdr->sample_rate / hdr->samples;
+    hdr->frame_length  = size;

     return size;
 }
diff --git a/libavcodec/adts_header.h b/libavcodec/adts_header.h
index f615f6a9f9..c362ce46a5 100644
--- a/libavcodec/adts_header.h
+++ b/libavcodec/adts_header.h
@@ -34,6 +34,7 @@ typedef struct AACADTSHeaderInfo {
     uint8_t  sampling_index;
     uint8_t  chan_config;
     uint8_t  num_aac_frames;
+    uint32_t frame_length;
 } AACADTSHeaderInfo;

 /**
diff --git a/libavcodec/adts_parser.c b/libavcodec/adts_parser.c
index 5c9f8ff6f2..7513b64181 100644
--- a/libavcodec/adts_parser.c
+++ b/libavcodec/adts_parser.c
@@ -21,7 +21,6 @@
 #include <stddef.h>
 #include <stdint.h>

-#include "adts_header.h"
 #include "adts_parser.h"

 int av_adts_header_parse(const uint8_t *buf, uint32_t *samples, uint8_t *frames)
@@ -42,3 +41,31 @@ int av_adts_header_parse(const uint8_t *buf, uint32_t *samples, uint8_t *frames)
     return AVERROR(ENOSYS);
 #endif
 }
+
+int avpriv_adts_header_parse (AACADTSHeaderInfo **phdr, const uint8_t *buf, size_t size)
+{
+#if CONFIG_ADTS_HEADER
+    int ret = 0;
+    GetBitContext gb;
+
+    if (size < AV_AAC_ADTS_HEADER_SIZE)
+        return AVERROR_INVALIDDATA;
+
+    if (!*phdr)
+        *phdr = av_mallocz(sizeof(AACADTSHeaderInfo));
+    if (!*phdr)
+        return AVERROR(ENOMEM);
+
+    ret = init_get_bits8(&gb, buf, AV_AAC_ADTS_HEADER_SIZE);
+    if (ret < 0)
+        return ret;
+
+    ret = ff_adts_header_parse(&gb, *phdr);
+    if (ret < 0)
+        return ret;
+
+    return 0;
+#else
+    return AVERROR(ENOSYS);
+#endif
+}
diff --git a/libavcodec/adts_parser.h b/libavcodec/adts_parser.h
index f85becd131..faa6e47426 100644
--- a/libavcodec/adts_parser.h
+++ b/libavcodec/adts_parser.h
@@ -22,6 +22,8 @@
 #include <stddef.h>
 #include <stdint.h>

+#include "adts_header.h"
+
 #define AV_AAC_ADTS_HEADER_SIZE 7

 /**
@@ -34,4 +36,6 @@
 int av_adts_header_parse(const uint8_t *buf, uint32_t *samples,
                          uint8_t *frames);

+int avpriv_adts_header_parse (AACADTSHeaderInfo **phdr, const uint8_t *buf, size_t size);
+
 #endif /* AVCODEC_ADTS_PARSER_H */
--
2.17.1

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