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Fri, 20 Jan 2017 12:28:13 -0800 (PST) Received: from localhost.localdomain ([94.250.166.143]) by smtp.gmail.com with ESMTPSA id f126sm7715449wme.22.2017.01.20.12.28.11 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 20 Jan 2017 12:28:11 -0800 (PST) From: Paul B Mahol To: ffmpeg-devel@ffmpeg.org Date: Fri, 20 Jan 2017 21:27:46 +0100 Message-Id: <20170120202746.26912-1-onemda@gmail.com> X-Mailer: git-send-email 2.9.3 Subject: [FFmpeg-devel] [PATCH] avformat: add MIDI Sample Dump Standard demuxer 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" Signed-off-by: Paul B Mahol --- libavformat/Makefile | 1 + libavformat/allformats.c | 1 + libavformat/sdsdec.c | 165 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 167 insertions(+) create mode 100644 libavformat/sdsdec.c diff --git a/libavformat/Makefile b/libavformat/Makefile index 872b30e..fbb28e3 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -435,6 +435,7 @@ OBJS-$(CONFIG_SAP_DEMUXER) += sapdec.o OBJS-$(CONFIG_SAP_MUXER) += sapenc.o OBJS-$(CONFIG_SBG_DEMUXER) += sbgdec.o OBJS-$(CONFIG_SDP_DEMUXER) += rtsp.o +OBJS-$(CONFIG_SDS_DEMUXER) += sdsdec.o OBJS-$(CONFIG_SDR2_DEMUXER) += sdr2.o OBJS-$(CONFIG_SEGAFILM_DEMUXER) += segafilm.o OBJS-$(CONFIG_SEGMENT_MUXER) += segment.o diff --git a/libavformat/allformats.c b/libavformat/allformats.c index 6a79b75..8787c79 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -274,6 +274,7 @@ void av_register_all(void) REGISTER_MUXDEMUX(SAP, sap); REGISTER_DEMUXER (SBG, sbg); REGISTER_DEMUXER (SDP, sdp); + REGISTER_DEMUXER (SDS, sds); REGISTER_DEMUXER (SDR2, sdr2); #if CONFIG_RTPDEC ff_register_rtp_dynamic_payload_handlers(); diff --git a/libavformat/sdsdec.c b/libavformat/sdsdec.c new file mode 100644 index 0000000..727586a --- /dev/null +++ b/libavformat/sdsdec.c @@ -0,0 +1,165 @@ +/* + * MIDI Sample Dump Standard format demuxer + * Copyright (c) 2017 Paul B Mahol + * + * 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 "libavutil/intreadwrite.h" +#include "avformat.h" +#include "internal.h" + +typedef struct SDSContext { + uint8_t data[120]; + int bit_depth; + int size; + void (*read_block)(const uint8_t *src, int32_t *dst); +} SDSContext; + +static int sds_probe(AVProbeData *p) +{ + if (AV_RB32(p->buf) == 0xF07E0001 && p->buf[20] == 0xF7 && + p->buf[6] >= 8 && p->buf[6] <= 28) + return AVPROBE_SCORE_EXTENSION; + return 0; +} + +static void byte2_read(const uint8_t *src, int32_t *dst) +{ + int i; + + for (i = 0; i < 120; i += 2) { + unsigned sample = (src[i + 0] << 25) + (src[i + 1] << 18); + + dst[i / 2] = sample; + } +} + +static void byte3_read(const uint8_t *src, int32_t *dst) +{ + int i; + + for (i = 0; i < 120; i += 3) { + unsigned sample; + + sample = (src[i + 0] << 25) | (src[i + 1] << 18) | (src[i + 2] << 11); + dst[i / 3] = sample; + } +} + +static void byte4_read(const uint8_t *src, int32_t *dst) +{ + int i; + + for (i = 0; i < 120; i += 4) { + unsigned sample; + + sample = (src[i + 0] << 25) | (src[i + 1] << 18) | (src[i + 2] << 11) | (src[i + 3] << 4); + dst[i / 4] = sample; + } +} + +#define SDS_3BYTE_TO_INT_DECODE(x) (((x) & 0x7F) | (((x) & 0x7F00) >> 1) | (((x) & 0x7F0000) >> 2)) + +static int sds_read_header(AVFormatContext *ctx) +{ + SDSContext *s = ctx->priv_data; + unsigned sample_period; + AVIOContext *pb = ctx->pb; + AVStream *st; + + st = avformat_new_stream(ctx, NULL); + if (!st) + return AVERROR(ENOMEM); + + avio_skip(pb, 4); + avio_skip(pb, 2); + + s->bit_depth = avio_r8(pb); + if (s->bit_depth < 8 || s->bit_depth > 28) + return AVERROR_INVALIDDATA; + + if (s->bit_depth < 14) { + s->read_block = byte2_read; + s->size = 60 * 4; + } else if (s->bit_depth < 21) { + s->read_block = byte3_read; + s->size = 40 * 4; + } else { + s->read_block = byte4_read; + s->size = 30 * 4; + } + st->codecpar->codec_id = AV_CODEC_ID_PCM_U32LE; + + sample_period = avio_rl24(pb); + sample_period = SDS_3BYTE_TO_INT_DECODE(sample_period); + avio_skip(pb, 11); + + st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; + st->codecpar->channels = 1; + st->codecpar->sample_rate = sample_period ? 1000000000 / sample_period : 16000; + st->duration = (avio_size(pb) - 21) / (127) * s->size / 4; + + avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); + + return 0; +} + +static int sds_read_packet(AVFormatContext *ctx, AVPacket *pkt) +{ + SDSContext *s = ctx->priv_data; + AVIOContext *pb = ctx->pb; + int64_t pos; + int ret; + + if (avio_feof(pb)) + return AVERROR_EOF; + + pos = avio_tell(pb); + if (avio_rb16(pb) != 0xF07E) + return AVERROR_INVALIDDATA; + avio_skip(pb, 3); + + avio_read(pb, s->data, 120); + + ret = av_new_packet(pkt, s->size); + if (ret < 0) + return ret; + + s->read_block(s->data, (int32_t *)pkt->data); + + avio_skip(pb, 1); // checksum + if (avio_r8(pb) != 0xF7) + return AVERROR_INVALIDDATA; + + pkt->flags &= ~AV_PKT_FLAG_CORRUPT; + pkt->stream_index = 0; + pkt->pos = pos; + + return ret; +} + +AVInputFormat ff_sds_demuxer = { + .name = "sds", + .long_name = NULL_IF_CONFIG_SMALL("MIDI Sample Dump Standard"), + .priv_data_size = sizeof(SDSContext), + .read_probe = sds_probe, + .read_header = sds_read_header, + .read_packet = sds_read_packet, + .extensions = "sds", + .flags = AVFMT_GENERIC_INDEX, +};