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Tue, 01 Sep 2020 04:30:51 -0700 (PDT) Received: from localhost.localdomain ([31.45.254.223]) by smtp.gmail.com with ESMTPSA id b1sm351791eja.124.2020.09.01.04.30.50 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Sep 2020 04:30:50 -0700 (PDT) From: Paul B Mahol To: ffmpeg-devel@ffmpeg.org Date: Tue, 1 Sep 2020 13:29:45 +0200 Message-Id: <20200901112946.3992-4-onemda@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200901112946.3992-1-onemda@gmail.com> References: <20200901112946.3992-1-onemda@gmail.com> Subject: [FFmpeg-devel] [PATCH 4/5] avformat: add moflex 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/moflex.c | 360 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 362 insertions(+) create mode 100644 libavformat/moflex.c diff --git a/libavformat/Makefile b/libavformat/Makefile index cbb33fe37c..1e0ac317e5 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -319,6 +319,7 @@ OBJS-$(CONFIG_MLV_DEMUXER) += mlvdec.o riffdec.o OBJS-$(CONFIG_MM_DEMUXER) += mm.o OBJS-$(CONFIG_MMF_DEMUXER) += mmf.o OBJS-$(CONFIG_MMF_MUXER) += mmf.o rawenc.o +OBJS-$(CONFIG_MOFLEX_DEMUXER) += moflex.o OBJS-$(CONFIG_MOV_DEMUXER) += mov.o mov_chan.o mov_esds.o replaygain.o OBJS-$(CONFIG_MOV_MUXER) += movenc.o av1.o avc.o hevc.o vpcc.o \ movenchint.o mov_chan.o rtp.o \ diff --git a/libavformat/allformats.c b/libavformat/allformats.c index 0aa9dd7198..28331facb9 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -249,6 +249,7 @@ extern AVInputFormat ff_mlv_demuxer; extern AVInputFormat ff_mm_demuxer; extern AVInputFormat ff_mmf_demuxer; extern AVOutputFormat ff_mmf_muxer; +extern AVInputFormat ff_moflex_demuxer; extern AVInputFormat ff_mov_demuxer; extern AVOutputFormat ff_mov_muxer; extern AVOutputFormat ff_mp2_muxer; diff --git a/libavformat/moflex.c b/libavformat/moflex.c new file mode 100644 index 0000000000..989623396f --- /dev/null +++ b/libavformat/moflex.c @@ -0,0 +1,360 @@ +/* + * MOFLEX demuxer + * Copyright (c) 2020 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 "libavcodec/bytestream.h" + +#include "avformat.h" +#include "internal.h" + +typedef struct BitReader { + unsigned last; + unsigned pos; +} BitReader; + +typedef struct MOFLEXDemuxContext { + unsigned size; + int64_t pos; + int64_t ts; + int flags; + int in_block; + + BitReader br; +} MOFLEXDemuxContext; + +static int pop(BitReader *br, AVIOContext *pb) +{ + if (avio_feof(pb)) + return AVERROR_EOF; + + if ((br->pos & 7) == 0) + br->last = (unsigned)avio_r8(pb) << 24U; + else + br->last <<= 1; + + br->pos++; + return !!(br->last & 0x80000000); +} + +static int pop_int(BitReader *br, AVIOContext *pb, int n) +{ + int value = 0; + + for (int i = 0; i < n; i++) { + int ret = pop(br, pb); + + if (ret < 0) + return ret; + value = 2 * value + ret; + } + + return value; +} + +static int pop_length(BitReader *br, AVIOContext *pb) +{ + int ret, n = 1; + + while ((ret = pop(br, pb)) == 0) + n++; + + if (ret < 0) + return ret; + return n; +} + +static int read_var_byte(AVFormatContext *s, unsigned *out) +{ + AVIOContext *pb = s->pb; + unsigned value = 0, data; + + data = avio_r8(pb); + if (!(data & 0x80)) { + *out = data; + return 0; + } + + value = (data & 0x7F) << 7; + data = avio_r8(pb); + if (!(data & 0x80)) { + value |= data; + *out = value; + return 0; + } + + value = ((data & 0x7F) | value) << 7; + data = avio_r8(pb); + if (!(data & 0x80)) { + value |= data; + *out = value; + return 0; + } + + value = (((data & 0x7F) | value) << 7) | avio_r8(pb); + *out = value; + + return 0; +} + +static int moflex_probe(const AVProbeData *p) +{ + GetByteContext gb; + int score = 0; + + bytestream2_init(&gb, p->buf, p->buf_size); + + if (bytestream2_get_be16(&gb) != 0x4C32) + return 0; + score += 10; + + bytestream2_skip(&gb, 10); + if (bytestream2_get_be16(&gb) == 0) + return 0; + score += 5; + + while (bytestream2_get_bytes_left(&gb) > 0) { + int type = bytestream2_get_byte(&gb); + int size = bytestream2_get_byte(&gb); + + if (type == 0) { + score += 5 * (size == 0); + break; + } + if ((type == 1 && size == 12) || + (type == 2 && size == 6) || + (type == 3 && size == 13) || + (type == 4 && size == 2)) + score += 20; + bytestream2_skip(&gb, size); + } + + return FFMIN(AVPROBE_SCORE_MAX, score); +} + +static int moflex_read_sync(AVFormatContext *s) +{ + MOFLEXDemuxContext *m = s->priv_data; + AVIOContext *pb = s->pb; + + if (avio_rb16(pb) != 0x4C32) { + if (avio_feof(pb)) + return AVERROR_EOF; + avio_seek(pb, -2, SEEK_CUR); + return 1; + } + + avio_skip(pb, 2); + m->ts = avio_rb64(pb); + m->size = avio_rb16(pb) + 1; + + while (!avio_feof(pb)) { + unsigned type, ssize, codec_id = 0; + unsigned codec_type, width = 0, height = 0, sample_rate = 0, channels = 0; + int stream_index = -1; + int format; + AVRational fps; + + read_var_byte(s, &type); + read_var_byte(s, &ssize); + + switch (type) { + case 0: + if (ssize > 0) + avio_skip(pb, ssize); + return 0; + case 2: + codec_type = AVMEDIA_TYPE_AUDIO; + stream_index = avio_r8(pb); + codec_id = avio_r8(pb); + switch (codec_id) { + case 0: codec_id = AV_CODEC_ID_FASTAUDIO; break; + case 1: codec_id = AV_CODEC_ID_ADPCM_IMA_MOFLEX; break; + case 2: codec_id = AV_CODEC_ID_PCM_S16LE; break; + default: + av_log(s, AV_LOG_ERROR, "Unsupported audio codec: %d\n", codec_id); + return AVERROR_PATCHWELCOME; + } + sample_rate = avio_rb24(pb) + 1; + channels = avio_r8(pb) + 1; + break; + case 1: + case 3: + codec_type = AVMEDIA_TYPE_VIDEO; + stream_index = avio_r8(pb); + codec_id = avio_r8(pb); + switch (codec_id) { + case 0: codec_id = AV_CODEC_ID_MOBICLIP; break; + default: + av_log(s, AV_LOG_ERROR, "Unsupported video codec: %d\n", codec_id); + return AVERROR_PATCHWELCOME; + } + fps.num = avio_rb16(pb); + fps.den = avio_rb16(pb); + width = avio_rb16(pb); + height = avio_rb16(pb); + format = AV_PIX_FMT_YUV420P; + avio_skip(pb, type == 3 ? 3 : 2); + break; + case 4: + codec_type = AVMEDIA_TYPE_DATA; + stream_index = avio_r8(pb); + avio_skip(pb, 1); + break; + } + + if (stream_index == s->nb_streams) { + AVStream *st = avformat_new_stream(s, NULL); + + if (!st) + return AVERROR(ENOMEM); + + st->codecpar->codec_type = codec_type; + st->codecpar->codec_id = codec_id; + st->codecpar->width = width; + st->codecpar->height = height; + st->codecpar->sample_rate= sample_rate; + st->codecpar->channels = channels; + st->codecpar->format = format; + st->priv_data = av_packet_alloc(); + if (!st->priv_data) + return AVERROR(ENOMEM); + + if (sample_rate) + avpriv_set_pts_info(st, 63, 1, sample_rate); + else + avpriv_set_pts_info(st, 63, fps.den, fps.num); + } + } + + return 0; +} + +static int moflex_read_header(AVFormatContext *s) +{ + int ret; + + ret = moflex_read_sync(s); + if (ret < 0) + return ret; + + s->ctx_flags |= AVFMTCTX_NOHEADER; + avio_seek(s->pb, 0, SEEK_SET); + + return 0; +} + +static int moflex_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + MOFLEXDemuxContext *m = s->priv_data; + AVIOContext *pb = s->pb; + BitReader *br = &m->br; + int ret; + + while (!avio_feof(pb)) { + if (!m->in_block) { + m->pos = avio_tell(pb); + + ret = moflex_read_sync(s); + if (ret < 0) + return ret; + + m->flags = avio_r8(pb); + if (m->flags & 2) + avio_skip(pb, 2); + } + + while ((avio_tell(pb) < m->pos + m->size) && !avio_feof(pb) && avio_r8(pb)) { + int stream_index, bits, pkt_size, endframe; + AVPacket *packet; + + m->in_block = 1; + + avio_seek(pb, -1, SEEK_CUR); + br->pos = br->last = 0; + + bits = pop_length(br, pb); + if (bits < 0) + return bits; + stream_index = pop_int(br, pb, bits); + if (stream_index < 0) + return stream_index; + if (stream_index >= s->nb_streams) + return AVERROR_INVALIDDATA; + + endframe = pop(br, pb); + if (endframe < 0) + return endframe; + if (endframe) { + bits = pop_length(br, pb); + if (bits < 0) + return bits; + pop_int(br, pb, bits); + pop(br, pb); + bits = pop_length(br, pb); + if (bits < 0) + return bits; + pop_int(br, pb, bits * 2 + 26); + } + + pkt_size = pop_int(br, pb, 13) + 1; + packet = s->streams[stream_index]->priv_data; + + ret = av_append_packet(pb, packet, pkt_size); + if (endframe) { + av_packet_move_ref(pkt, packet); + pkt->pos = m->pos; + pkt->stream_index = stream_index; + pkt->flags |= AV_PKT_FLAG_KEY; + return ret; + } + } + + m->in_block = 0; + + if (m->flags % 2 == 0) + avio_seek(pb, m->pos + m->size, SEEK_SET); + } + + return AVERROR_EOF; +} + +static int moflex_read_close(AVFormatContext *s) +{ + for (int i = 0; i < s->nb_streams; i++) { + AVPacket *packet = s->streams[i]->priv_data; + + av_packet_free(&packet); + s->streams[i]->priv_data = 0; + } + + return 0; +} + +AVInputFormat ff_moflex_demuxer = { + .name = "moflex", + .long_name = NULL_IF_CONFIG_SMALL("MobiClip MOFLEX"), + .priv_data_size = sizeof(MOFLEXDemuxContext), + .read_probe = moflex_probe, + .read_header = moflex_read_header, + .read_packet = moflex_read_packet, + .read_close = moflex_read_close, + .extensions = "moflex", + .flags = AVFMT_GENERIC_INDEX, +};