From patchwork Thu Jan 21 19:41:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nachiket Tarate X-Patchwork-Id: 25053 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 EC52444AF0A for ; Thu, 21 Jan 2021 21:41:57 +0200 (EET) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id BDA03688298; Thu, 21 Jan 2021 21:41:57 +0200 (EET) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from mail-pj1-f50.google.com (mail-pj1-f50.google.com [209.85.216.50]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id E8F236801CF for ; Thu, 21 Jan 2021 21:41:51 +0200 (EET) Received: by mail-pj1-f50.google.com with SMTP id g15so2338211pjd.2 for ; Thu, 21 Jan 2021 11:41:51 -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=kIQLT1xj/FpW2hqEvlibINTsPxx9BYw+Dc9/vj/BjvQ=; b=LKGnv5AaTnP9GdDgYPE0zHobV1qIAAh0rCO1bNHcrd/i8CvU5HCgbs4HbutZKl2J6/ T88pq3PFdIEGPZzEs5ThUW7WsWiGFfEBcfK7go4aRfG1w2L1A4L9i0csz2eFq31RH+JB R85LPhicyr3dIm9xicHHhrihCs++oLDzhc2eIn+WDDp01969CpLRjmYx6jlReiKuDOQd VWDN5ofXewLEW6esdhJnZwlsekfEog3FeC6IYCI2Xjoc5mv6GdNTt5Zy0G+Ov5q8mzHN NVJkindva7QheagiW5oVA2xqnsYOseUGHPbz0Le6S074OA0LvXtzmEcaWn/3t6qbCShF DPYw== 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=kIQLT1xj/FpW2hqEvlibINTsPxx9BYw+Dc9/vj/BjvQ=; b=W8BzbBr2OqRJjyA7F6Hyxym5esXbF0i511p32nxmmDgj7DNHTwvZC26nVYJe3689CU e3V3UXv8z97J1qXHDMYAuLz2kfwc/h47dzBZwTuwtbqbfd8eBtEWlObC95wZxsCNgIQs +gNwsZAFonv9MltVigOeFBU1B/D53dSgMYmiw1+j6tYfKkXpgbV5aeRbAe9brzi0G8aX F4FYbVycSuJdfPkWPdNSODRGK9p6vpDSB269zwzLqIQooiNVkP4g1y+6zgMBgFaozffP 6mjhzTJjbjQ/LConTv35aqoclrbqITzOo68qvxsSEjeyteZhNvSxnyYdwh7cnu8zqNY9 rxoA== X-Gm-Message-State: AOAM533Qni1muZ0Ii2HJaBsqfplSMrKlXAKUlMWb8YIl1BvVA3QaUfjp LCr/ULncjrDdJdNU4QA8j5YVA6/DRFuKrw== X-Google-Smtp-Source: ABdhPJzeT7sVBISsV/CKyKUcJwVtKD7PKqFXwHjmimwE0AK+oRKE2Kfn+rEIuvsczvFk93242nR2iA== X-Received: by 2002:a17:90a:2ec7:: with SMTP id h7mr1078184pjs.200.1611258109922; Thu, 21 Jan 2021 11:41:49 -0800 (PST) Received: from localhost.localdomain ([2401:4900:30cf:cfd2:dd47:1715:856f:2bb9]) by smtp.gmail.com with ESMTPSA id k32sm5345769pjc.36.2021.01.21.11.41.47 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Jan 2021 11:41:49 -0800 (PST) From: Nachiket Tarate To: ffmpeg-devel@ffmpeg.org Date: Fri, 22 Jan 2021 01:11:30 +0530 Message-Id: <20210121194130.13600-1-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 encryption/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..efdb5cdc15 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..2f10b9adcf 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 +}