From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTP id 4B621453D5 for ; Fri, 27 Jan 2023 18:44:27 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 359A668BE75; Fri, 27 Jan 2023 20:44:26 +0200 (EET) Received: from mail0.khirnov.net (red.khirnov.net [176.97.15.12]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 543F768BCF8 for ; Fri, 27 Jan 2023 20:44:19 +0200 (EET) Received: from localhost (localhost [IPv6:::1]) by mail0.khirnov.net (Postfix) with ESMTP id 1D01A2404EC for ; Fri, 27 Jan 2023 19:44:19 +0100 (CET) Received: from mail0.khirnov.net ([IPv6:::1]) by localhost (mail0.khirnov.net [IPv6:::1]) (amavisd-new, port 10024) with ESMTP id Ca2C4P0gE8MS for ; Fri, 27 Jan 2023 19:44:18 +0100 (CET) Received: from libav.khirnov.net (libav.khirnov.net [IPv6:2a00:c500:561:201::7]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "libav.khirnov.net", Issuer "smtp.khirnov.net SMTP CA" (verified OK)) by mail0.khirnov.net (Postfix) with ESMTPS id 169B3240178 for ; Fri, 27 Jan 2023 19:44:18 +0100 (CET) Received: from libav.khirnov.net (libav.khirnov.net [IPv6:::1]) by libav.khirnov.net (Postfix) with ESMTP id D85D53A02AF for ; Fri, 27 Jan 2023 19:44:17 +0100 (CET) From: Anton Khirnov To: ffmpeg-devel@ffmpeg.org Date: Fri, 27 Jan 2023 19:44:15 +0100 Message-Id: <20230127184415.11478-1-anton@khirnov.net> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH] lavc: add null codecs X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: They discard all input without ever returning any output. Useful for development. --- libavcodec/Makefile | 4 ++ libavcodec/allcodecs.c | 6 +++ libavcodec/codec_desc.c | 12 ++++++ libavcodec/codec_id.h | 10 +++++ libavcodec/null.c | 96 +++++++++++++++++++++++++++++++++++++++++ libavcodec/version.h | 2 +- 6 files changed, 129 insertions(+), 1 deletion(-) create mode 100644 libavcodec/null.c diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 2d9710923d..098ab18353 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -219,6 +219,8 @@ OBJS-$(CONFIG_AMRWB_DECODER) += amrwbdec.o celp_filters.o \ acelp_pitch_delay.o OBJS-$(CONFIG_AMV_ENCODER) += mjpegenc.o mjpegenc_common.o OBJS-$(CONFIG_ANM_DECODER) += anm.o +OBJS-$(CONFIG_ANULL_DECODER) += null.o +OBJS-$(CONFIG_ANULL_ENCODER) += null.o OBJS-$(CONFIG_ANSI_DECODER) += ansi.o cga_data.o OBJS-$(CONFIG_APAC_DECODER) += apac.o OBJS-$(CONFIG_APE_DECODER) += apedec.o @@ -746,6 +748,8 @@ OBJS-$(CONFIG_VCR1_DECODER) += vcr1.o OBJS-$(CONFIG_VMDAUDIO_DECODER) += vmdaudio.o OBJS-$(CONFIG_VMDVIDEO_DECODER) += vmdvideo.o OBJS-$(CONFIG_VMNC_DECODER) += vmnc.o +OBJS-$(CONFIG_VNULL_DECODER) += null.o +OBJS-$(CONFIG_VNULL_ENCODER) += null.o OBJS-$(CONFIG_VORBIS_DECODER) += vorbisdec.o vorbisdsp.o vorbis.o \ vorbis_data.o OBJS-$(CONFIG_VORBIS_ENCODER) += vorbisenc.o vorbis.o \ diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index f728c6c82e..7452002f24 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -882,6 +882,12 @@ extern const FFCodec ff_vp9_qsv_decoder; extern const FFCodec ff_vp9_vaapi_encoder; extern const FFCodec ff_vp9_qsv_encoder; +// null codecs +extern const FFCodec ff_vnull_decoder; +extern const FFCodec ff_vnull_encoder; +extern const FFCodec ff_anull_decoder; +extern const FFCodec ff_anull_encoder; + // The iterate API is not usable with ossfuzz due to the excessive size of binaries created #if CONFIG_OSSFUZZ const FFCodec * codec_list[] = { diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c index 2272232ed6..b3bec2f659 100644 --- a/libavcodec/codec_desc.c +++ b/libavcodec/codec_desc.c @@ -1923,6 +1923,12 @@ static const AVCodecDescriptor codec_descriptors[] = { .long_name = NULL_IF_CONFIG_SMALL("ViewQuest VQC"), .props = AV_CODEC_PROP_LOSSY, }, + { + .id = AV_CODEC_ID_VNULL, + .type = AVMEDIA_TYPE_VIDEO, + .name = "vnull", + .long_name = NULL_IF_CONFIG_SMALL("Null video codec"), + }, /* various PCM "codecs" */ { @@ -3339,6 +3345,12 @@ static const AVCodecDescriptor codec_descriptors[] = { .long_name = NULL_IF_CONFIG_SMALL("FTR Voice"), .props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY, }, + { + .id = AV_CODEC_ID_ANULL, + .type = AVMEDIA_TYPE_AUDIO, + .name = "anull", + .long_name = NULL_IF_CONFIG_SMALL("Null audio codec"), + }, /* subtitle codecs */ { diff --git a/libavcodec/codec_id.h b/libavcodec/codec_id.h index 5ec3fd4b30..c197e956b7 100644 --- a/libavcodec/codec_id.h +++ b/libavcodec/codec_id.h @@ -320,6 +320,11 @@ enum AVCodecID { AV_CODEC_ID_WBMP, AV_CODEC_ID_MEDIA100, AV_CODEC_ID_VQC, + /** + * Dummy null video codec, useful mainly for development and debugging. + * Null encoder/decoder discard all input and never return any output. + */ + AV_CODEC_ID_VNULL, /* various PCM "codecs" */ AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs @@ -534,6 +539,11 @@ enum AVCodecID { AV_CODEC_ID_MISC4, AV_CODEC_ID_APAC, AV_CODEC_ID_FTR, + /** + * Dummy null audio codec, useful mainly for development and debugging. + * Null encoder/decoder discard all input and never return any output. + */ + AV_CODEC_ID_ANULL, /* subtitle codecs */ AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs. diff --git a/libavcodec/null.c b/libavcodec/null.c new file mode 100644 index 0000000000..df75a077ae --- /dev/null +++ b/libavcodec/null.c @@ -0,0 +1,96 @@ +/* + * Null codecs + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "config_components.h" + +#include "codec_internal.h" +#include "decode.h" +#include "encode.h" + +#if CONFIG_VNULL_DECODER || CONFIG_ANULL_DECODER +static int null_decode(AVCodecContext *avctx, AVFrame *frame, + int *got_frame, AVPacket *avpkt) +{ + *got_frame = 0; + return avpkt->size; +} + +#if CONFIG_VNULL_DECODER +const FFCodec ff_vnull_decoder = { + .p.name = "vnull", + CODEC_LONG_NAME("null video"), + .p.type = AVMEDIA_TYPE_VIDEO, + .p.id = AV_CODEC_ID_VNULL, + .p.capabilities = AV_CODEC_CAP_DR1, + FF_CODEC_DECODE_CB(null_decode), +}; +#endif + +#if CONFIG_ANULL_DECODER +const FFCodec ff_anull_decoder = { + .p.name = "anull", + CODEC_LONG_NAME("null audio"), + .p.type = AVMEDIA_TYPE_AUDIO, + .p.id = AV_CODEC_ID_ANULL, + .p.capabilities = AV_CODEC_CAP_DR1, + FF_CODEC_DECODE_CB(null_decode), +}; +#endif + +#endif + +#if CONFIG_VNULL_ENCODER || CONFIG_ANULL_ENCODER +static int null_encode(AVCodecContext *avctx, AVPacket *pkt, + const AVFrame *frame, int *got_packet) +{ + *got_packet = 0; + return 0; +} + +#if CONFIG_VNULL_ENCODER +const FFCodec ff_vnull_encoder = { + .p.name = "vnull", + CODEC_LONG_NAME("null video"), + .p.type = AVMEDIA_TYPE_VIDEO, + .p.id = AV_CODEC_ID_VNULL, + FF_CODEC_ENCODE_CB(null_encode), +}; +#endif + +#if CONFIG_ANULL_ENCODER +const FFCodec ff_anull_encoder = { + .p.name = "anull", + CODEC_LONG_NAME("null audio"), + .p.type = AVMEDIA_TYPE_AUDIO, + .p.id = AV_CODEC_ID_ANULL, + .p.capabilities = AV_CODEC_CAP_VARIABLE_FRAME_SIZE, + .p.sample_fmts = (const enum AVSampleFormat[]){ + AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_U8P, + AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P, + AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P, + AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S64P, + AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP, + AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP, + }, + FF_CODEC_ENCODE_CB(null_encode), +}; +#endif + +#endif diff --git a/libavcodec/version.h b/libavcodec/version.h index dfd3d5d7e5..7ac8d2b2fe 100644 --- a/libavcodec/version.h +++ b/libavcodec/version.h @@ -29,7 +29,7 @@ #include "version_major.h" -#define LIBAVCODEC_VERSION_MINOR 57 +#define LIBAVCODEC_VERSION_MINOR 58 #define LIBAVCODEC_VERSION_MICRO 100 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \ -- 2.35.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".