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[79.124.17.100]) by mx.google.com with ESMTP id h124si5578843wmg.62.2016.09.27.16.11.04; Tue, 27 Sep 2016 16:11:06 -0700 (PDT) Received-SPF: pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) client-ip=79.124.17.100; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@google.com; spf=pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) smtp.mailfrom=ffmpeg-devel-bounces@ffmpeg.org Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 481ED689F2D; Wed, 28 Sep 2016 02:10:50 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from mail-pf0-f172.google.com (mail-pf0-f172.google.com [209.85.192.172]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 1B09B689C0E for ; Wed, 28 Sep 2016 02:10:44 +0300 (EEST) Received: by mail-pf0-f172.google.com with SMTP id s13so10405037pfd.2 for ; Tue, 27 Sep 2016 16:10:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=6nsqKWIHfOb+bz32wvX6BAXT/Rrq/dI4b5bqfIDlPYg=; b=mUrpKbRBDy/WRe0WDl7Tvm3cxu1oJ06E/gXiTHfsGBc+PYRe4ZeXVVoGioOib4MqAs GUOUf5Z3rtCDuViYguI5L08qSZe6ZoJsfeupADfASVaog3uLhgGI+TtBJrvpokltxmXT YHn7x9RhfDCJvtDPVMebqrZYhl89p4FqO6DppRuUi4kUATZ7WYPvlaUjQ/zFN+VGSvTF 7n/YfCJqqvlDJL1FkPDRYzgJdUgoXKTS6xXRZ3NnHuf1kygx4EAh62k5GnCKANpgFetM UtzcvK239fHwTOHhqGPi312g8IyPwtLWYwcQ9w+GfXIp4tSpwm6c5iLGtKEy8VDhnwcB 7z3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=6nsqKWIHfOb+bz32wvX6BAXT/Rrq/dI4b5bqfIDlPYg=; b=X4dD1x82xkKzITUTIcBH7OPrV28w8SXl/nwqqKKm7ZWriZTCi4MpPC4XKawx7wuL+E DGB+4hoQAKMZAwQPZT9Gnk227DcQptnGSpc4eRlnjXS8drz+We8tDOeVVRiuoQXSkuPk atAE2wLYGOLcPyI6T4GaTAFig0qJqrUVQxqDksdfWTDdmjYPMX8R93BL8zh+4WE38T2j AbcqXCSDfo7JD3KOMaIO0JG6VDPSlvc53i7nWJ2RJ97nLY0rrVSRz3QPp6MVS+eOTNSn vOG/VL5hN0fwxoF2G8ST7RgjNDDg5EvueamrK3di9rbfpcTjR6YvyDVG3/iAv998Uqmd GAYQ== X-Gm-Message-State: AE9vXwMNJzuFWAoB7tctdis5Ls4gCGJhJ7o3ZvKyYD4bLZGFtTF07T5gkgsDqdHscQh04Ve1 X-Received: by 10.98.61.203 with SMTP id x72mr52444360pfj.50.1475017853886; Tue, 27 Sep 2016 16:10:53 -0700 (PDT) Received: from isasi.mtv.corp.google.com ([172.27.82.89]) by smtp.gmail.com with ESMTPSA id tn5sm7315936pac.6.2016.09.27.16.10.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 27 Sep 2016 16:10:53 -0700 (PDT) From: Sasi Inguva To: ffmpeg-devel@ffmpeg.org Date: Tue, 27 Sep 2016 16:10:11 -0700 Message-Id: <1475017811-21854-1-git-send-email-isasi@google.com> X-Mailer: git-send-email 2.8.0.rc3.226.g39d4020 In-Reply-To: <20160927190248.GA26091@sunshine.barsnick.net> References: <20160927190248.GA26091@sunshine.barsnick.net> Subject: [FFmpeg-devel] [PATCH 2/3] lavf/mov.c: Make audio timestamps strictly monotonically increasing inside an edit list. 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 Cc: Sasi Inguva MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Fixes gapless decoding. Adjust skip_samples field correctly in case of DISCARDed audio frames. Signed-off-by: Sasi Inguva --- libavformat/mov.c | 80 ++++++++++++++++++++++++---- tests/ref/fate/gaplessenc-itunes-to-ipod-aac | 2 +- tests/ref/fate/gaplessenc-pcm-to-mov-aac | 2 +- 3 files changed, 71 insertions(+), 13 deletions(-) diff --git a/libavformat/mov.c b/libavformat/mov.c index b84d9c0..8b7bbf1 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -2856,6 +2856,21 @@ static int64_t add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, } /** + * Rewrite timestamps of index entries in the range [end_index - frame_duration_buffer_size, end_index) + * by subtracting end_ts successively by the amounts given in frame_duration_buffer. + */ +static void fix_index_entry_timestamps(AVStream* st, int end_index, int64_t end_ts, + int64_t* frame_duration_buffer, + int frame_duration_buffer_size) { + int i = 0; + av_assert0(end_index >= 0 && end_index <= st->nb_index_entries); + for (i = 0; i < frame_duration_buffer_size; i++) { + end_ts -= frame_duration_buffer[frame_duration_buffer_size - 1 - i]; + st->index_entries[end_index - 1 - i].timestamp = end_ts; + } +} + +/** * Append a new ctts entry to ctts_data. * Returns the new ctts_count if successful, else returns -1. */ @@ -2919,7 +2934,10 @@ static void mov_fix_index(MOVContext *mov, AVStream *st) int64_t edit_list_media_time_dts = 0; int64_t edit_list_start_encountered = 0; int64_t search_timestamp = 0; - + int64_t* frame_duration_buffer = NULL; + int num_discarded_begin = 0; + int first_non_zero_audio_edit = -1; + int packet_skip_samples = 0; if (!msc->elst_data || msc->elst_count <= 0) { return; @@ -2955,6 +2973,7 @@ static void mov_fix_index(MOVContext *mov, AVStream *st) edit_list_index++; edit_list_dts_counter = edit_list_dts_entry_end; edit_list_dts_entry_end += edit_list_duration; + num_discarded_begin = 0; if (edit_list_media_time == -1) { continue; } @@ -2962,7 +2981,14 @@ static void mov_fix_index(MOVContext *mov, AVStream *st) // If we encounter a non-negative edit list reset the skip_samples/start_pad fields and set them // according to the edit list below. if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) { - st->skip_samples = msc->start_pad = 0; + if (first_non_zero_audio_edit < 0) { + first_non_zero_audio_edit = 1; + } else { + first_non_zero_audio_edit = 0; + } + + if (first_non_zero_audio_edit > 0) + st->skip_samples = msc->start_pad = 0; } //find closest previous key frame @@ -3041,24 +3067,56 @@ static void mov_fix_index(MOVContext *mov, AVStream *st) } if (curr_cts < edit_list_media_time || curr_cts >= (edit_list_duration + edit_list_media_time)) { - if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && curr_cts < edit_list_media_time && - curr_cts + frame_duration > edit_list_media_time && - st->skip_samples == 0 && msc->start_pad == 0) { - st->skip_samples = msc->start_pad = edit_list_media_time - curr_cts; - - // Shift the index entry timestamp by skip_samples to be correct. - edit_list_dts_counter -= st->skip_samples; + if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->codecpar->codec_id != AV_CODEC_ID_VORBIS && + curr_cts < edit_list_media_time && curr_cts + frame_duration > edit_list_media_time && + first_non_zero_audio_edit > 0) { + packet_skip_samples = edit_list_media_time - curr_cts; + st->skip_samples += packet_skip_samples; + + // Shift the index entry timestamp by packet_skip_samples to be correct. + edit_list_dts_counter -= packet_skip_samples; if (edit_list_start_encountered == 0) { - edit_list_start_encountered = 1; + edit_list_start_encountered = 1; + // Make timestamps strictly monotonically increasing for audio, by rewriting timestamps for + // discarded packets. + if (frame_duration_buffer) { + fix_index_entry_timestamps(st, st->nb_index_entries, edit_list_dts_counter, + frame_duration_buffer, num_discarded_begin); + av_freep(&frame_duration_buffer); + } } - av_log(mov->fc, AV_LOG_DEBUG, "skip %d audio samples from curr_cts: %"PRId64"\n", st->skip_samples, curr_cts); + av_log(mov->fc, AV_LOG_DEBUG, "skip %d audio samples from curr_cts: %"PRId64"\n", packet_skip_samples, curr_cts); } else { flags |= AVINDEX_DISCARD_FRAME; av_log(mov->fc, AV_LOG_DEBUG, "drop a frame at curr_cts: %"PRId64" @ %"PRId64"\n", curr_cts, index); + + if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && edit_list_start_encountered == 0) { + num_discarded_begin++; + frame_duration_buffer = av_realloc(frame_duration_buffer, + num_discarded_begin * sizeof(int64_t)); + if (!frame_duration_buffer) { + av_log(mov->fc, AV_LOG_ERROR, "Cannot reallocate frame duration buffer\n"); + break; + } + frame_duration_buffer[num_discarded_begin - 1] = frame_duration; + + // Increment skip_samples for the first non-zero audio edit list + if (first_non_zero_audio_edit > 0 && st->codecpar->codec_id != AV_CODEC_ID_VORBIS) { + st->skip_samples += frame_duration; + msc->start_pad = st->skip_samples; + } + } } } else if (edit_list_start_encountered == 0) { edit_list_start_encountered = 1; + // Make timestamps strictly monotonically increasing for audio, by rewriting timestamps for + // discarded packets. + if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && frame_duration_buffer) { + fix_index_entry_timestamps(st, st->nb_index_entries, edit_list_dts_counter, + frame_duration_buffer, num_discarded_begin); + av_freep(&frame_duration_buffer); + } } if (add_index_entry(st, current->pos, edit_list_dts_counter, current->size, diff --git a/tests/ref/fate/gaplessenc-itunes-to-ipod-aac b/tests/ref/fate/gaplessenc-itunes-to-ipod-aac index 043c085..789681f 100644 --- a/tests/ref/fate/gaplessenc-itunes-to-ipod-aac +++ b/tests/ref/fate/gaplessenc-itunes-to-ipod-aac @@ -7,7 +7,7 @@ duration_ts=103326 start_time=0.000000 duration=2.367000 [/FORMAT] -packet|pts=0|dts=0|duration=N/A +packet|pts=-1024|dts=-1024|duration=1024 packet|pts=0|dts=0|duration=1024 packet|pts=1024|dts=1024|duration=1024 packet|pts=2048|dts=2048|duration=1024 diff --git a/tests/ref/fate/gaplessenc-pcm-to-mov-aac b/tests/ref/fate/gaplessenc-pcm-to-mov-aac index 8b7e3f6..8702611 100644 --- a/tests/ref/fate/gaplessenc-pcm-to-mov-aac +++ b/tests/ref/fate/gaplessenc-pcm-to-mov-aac @@ -7,7 +7,7 @@ duration_ts=529200 start_time=0.000000 duration=12.024000 [/FORMAT] -packet|pts=0|dts=0|duration=N/A +packet|pts=-1024|dts=-1024|duration=1024 packet|pts=0|dts=0|duration=1024 packet|pts=1024|dts=1024|duration=1024 packet|pts=2048|dts=2048|duration=1024