From patchwork Thu Jan 28 15:08:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nachiket Tarate X-Patchwork-Id: 25232 Return-Path: X-Original-To: patchwork@ffaux-bg.ffmpeg.org Delivered-To: patchwork@ffaux-bg.ffmpeg.org Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by ffaux.localdomain (Postfix) with ESMTP id B75E144B50F for ; Thu, 28 Jan 2021 17:18:45 +0200 (EET) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 9C12E68A6B5; Thu, 28 Jan 2021 17:18:45 +0200 (EET) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from mail-pj1-f41.google.com (mail-pj1-f41.google.com [209.85.216.41]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 4277D68A640 for ; Thu, 28 Jan 2021 17:18:39 +0200 (EET) Received: by mail-pj1-f41.google.com with SMTP id md11so4034170pjb.0 for ; Thu, 28 Jan 2021 07:18:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id; bh=u12mWluNhksZzm4dC+2ExUi7k6zVYt7wNHNHsYkMblE=; b=PLx961JwCWQPEnsRN6feDuCSLC/YS6Cs52HckpP65nMMbJi1BPC1NgcfEIgYaakOsk 6Hu50rk8b2J7O4ixSWRIIG/ikrT9MmMZJP9PYtzdMK7e/Rmga+0bD2iDNKPGf4elktTr tKLJZ6G6J69dNi97f7oYWjfXM9fBNKx5NGC72ZzZ+N1M97BW8o5LIRnlioROvER7Niwx mIEkp4pCxCuqqXEalwmEnJHVc6tduwdsGH5MHq4XHHKQpM+EUlH0MXnhJHIwXVJH//Ib Pv3MNNb7ceB/nh4KCA7RnCUSzouEXjVw6lkA1PLdm9MeI/LCTE9izPGSCKhZpluDwBp5 sPFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id; bh=u12mWluNhksZzm4dC+2ExUi7k6zVYt7wNHNHsYkMblE=; b=H6qyeB1iLxyo7F1oUW/gDyoeQsQng4NP7oQGJVsvhTenSJvGZXOrUj+vZkC+RWvVsT Z7KlWwObVERv71AV8Yu9LT8kL5Al+qLH4Lk087Zos/PjJZrsgO6cwUYsEhd6O4TZch01 E3MWAFcoE+RDu0WVgBCuWGAbOOR7slYiL0SWTELVH1t2b5pkmHC5DnUUNzMXfiB30OTr Wg2PQaxkzY4Xldc4X6OUp5XeXRmOZNolkGqHgTZqv0wcYRcqfQZ7WCDy7opJ6JIU7DU1 pinHfL2M41iEQudSh6/P/VFih0d5nNh8Hezm/6u8Jh+sn4GzrkEVrFKJ6E2AGwGeZdmA FA+A== X-Gm-Message-State: AOAM531mJp5MtflgRpj0GU6NODPJDvO3Zn+Byfqrd/GoCC4Mt+6osh3u 1EeCRHuXmct1CFegX9vurqI4XK+fCCPfyg== X-Google-Smtp-Source: ABdhPJwpF9KB2mYoRjaNfrQ+yIcpt5tzkgzJ4DPJGUqEIb2l+c66+nGweAhidUoUugpTlYLIVncqtw== X-Received: by 2002:a62:2984:0:b029:1b4:72bd:f2bf with SMTP id p126-20020a6229840000b02901b472bdf2bfmr16035473pfp.59.1611846676707; Thu, 28 Jan 2021 07:11:16 -0800 (PST) Received: from lab-21.india.rsystems.com ([106.198.209.130]) by smtp.gmail.com with ESMTPSA id o13sm6334261pfp.101.2021.01.28.07.11.14 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Jan 2021 07:11:16 -0800 (PST) From: Nachiket Tarate To: ffmpeg-devel@ffmpeg.org Date: Thu, 28 Jan 2021 20:38:07 +0530 Message-Id: <20210128150807.17552-1-nachiket.programmer@gmail.com> X-Mailer: git-send-email 2.17.1 Subject: [FFmpeg-devel] [PATCH 1/3] libavcodec/adts_header: add frame_length field and avpriv function to parse AAC ADTS header X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" These will be used by HLS demuxer in case of SAMPLE-AES decryption. Signed-off-by: Nachiket Tarate --- libavcodec/adts_header.c | 1 + libavcodec/adts_header.h | 14 ++++++++++++++ libavcodec/adts_parser.c | 28 ++++++++++++++++++++++++++++ 3 files changed, 43 insertions(+) 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..9ecd67fb5b 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; /** @@ -47,4 +48,17 @@ typedef struct AACADTSHeaderInfo { */ int ff_adts_header_parse(GetBitContext *gbc, AACADTSHeaderInfo *hdr); +/** + * Parse the ADTS frame header contained in the buffer, which is + * the first 54 bits. + * @param[in] buf Pointer to buffer containing the first 54 bits of the frame. + * @param[in] size Size of buffer containing the first 54 bits of the frame. + * @param[out] phdr Pointer to pointer to struct AACADTSHeaderInfo for which + * memory is allocated and header info is written into it. + * @return Returns 0 on success, -1 if there is a sync word mismatch, + * -2 if the version element is invalid, -3 if the sample rate + * element is invalid, or -4 if the bit rate element is invalid. + */ +int avpriv_adts_header_parse(AACADTSHeaderInfo **phdr, const uint8_t *buf, size_t size); + #endif /* AVCODEC_ADTS_HEADER_H */ diff --git a/libavcodec/adts_parser.c b/libavcodec/adts_parser.c index 5c9f8ff6f2..7df714e227 100644 --- a/libavcodec/adts_parser.c +++ b/libavcodec/adts_parser.c @@ -42,3 +42,31 @@ 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 +}