From c94841487622e52f95e6c703514d604b6ae8e47d Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Fri, 2 Jun 2017 11:28:35 +0200 Subject: avformat: add Gremlin Digital Video demuxer Signed-off-by: Paul B Mahol --- libavformat/Makefile | 1 + libavformat/allformats.c | 1 + libavformat/gdv.c | 161 +++++++++++++++++++++++++++++++++++++++++++++++ libavformat/version.h | 4 +- 4 files changed, 165 insertions(+), 2 deletions(-) create mode 100644 libavformat/gdv.c (limited to 'libavformat') diff --git a/libavformat/Makefile b/libavformat/Makefile index 00cba52a43..80aeed22c0 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -192,6 +192,7 @@ OBJS-$(CONFIG_G722_MUXER) += rawenc.o OBJS-$(CONFIG_G723_1_DEMUXER) += g723_1.o OBJS-$(CONFIG_G723_1_MUXER) += rawenc.o OBJS-$(CONFIG_G729_DEMUXER) += g729dec.o +OBJS-$(CONFIG_GDV_DEMUXER) += gdv.o OBJS-$(CONFIG_GENH_DEMUXER) += genh.o OBJS-$(CONFIG_H261_DEMUXER) += h261dec.o rawdec.o OBJS-$(CONFIG_H261_MUXER) += rawenc.o diff --git a/libavformat/allformats.c b/libavformat/allformats.c index ad516eba06..a0e2fb8c85 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -134,6 +134,7 @@ static void register_all(void) REGISTER_MUXDEMUX(G722, g722); REGISTER_MUXDEMUX(G723_1, g723_1); REGISTER_DEMUXER (G729, g729); + REGISTER_DEMUXER (GDV, gdv); REGISTER_DEMUXER (GENH, genh); REGISTER_MUXDEMUX(GIF, gif); REGISTER_MUXDEMUX(GSM, gsm); diff --git a/libavformat/gdv.c b/libavformat/gdv.c new file mode 100644 index 0000000000..87bba2fdbd --- /dev/null +++ b/libavformat/gdv.c @@ -0,0 +1,161 @@ +/* + * Gremlin Digital Video 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 "avio.h" +#include "internal.h" + +typedef struct GDVContext { + int is_first_video; + int is_audio; + int audio_size; + int audio_stream_index; + int video_stream_index; + unsigned pal[256]; +} GDVContext; + +static int gdv_read_probe(AVProbeData *p) +{ + if (AV_RL32(p->buf) == 0x29111994) + return AVPROBE_SCORE_MAX; + + return 0; +} + +static int gdv_read_header(AVFormatContext *ctx) +{ + GDVContext *gdv = ctx->priv_data; + AVIOContext *pb = ctx->pb; + AVStream *vst, *ast; + unsigned fps, snd_flags, vid_depth; + + avio_skip(pb, 6); + + vst = avformat_new_stream(ctx, 0); + if (!vst) + return AVERROR(ENOMEM); + + vst->start_time = 0; + vst->duration = + vst->nb_frames = avio_rl16(pb); + + fps = avio_rl16(pb); + snd_flags = avio_rl16(pb); + if (snd_flags & 1) { + ast = avformat_new_stream(ctx, 0); + if (!ast) + return AVERROR(ENOMEM); + + ast->start_time = 0; + ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; + ast->codecpar->codec_tag = 0; + ast->codecpar->sample_rate = avio_rl16(pb); + ast->codecpar->channels = 1 + !!(snd_flags & 2); + if (snd_flags & 8) { + ast->codecpar->codec_id = AV_CODEC_ID_GREMLIN_DPCM; + } else { + ast->codecpar->codec_id = (snd_flags & 4) ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_U8; + } + + avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate); + gdv->audio_size = (ast->codecpar->sample_rate / fps) * + ast->codecpar->channels * (1 + !!(snd_flags & 4)) / (1 + !!(snd_flags & 8)); + gdv->is_audio = 1; + } + vid_depth = avio_rl16(pb); + avio_skip(pb, 4); + + vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; + vst->codecpar->codec_id = AV_CODEC_ID_GDV; + vst->codecpar->codec_tag = 0; + vst->codecpar->width = avio_rl16(pb); + vst->codecpar->height = avio_rl16(pb); + + avpriv_set_pts_info(vst, 64, 1, fps); + + if (vid_depth & 1) { + int i; + + for (i = 0; i < 256; i++) { + unsigned r = avio_r8(pb); + unsigned g = avio_r8(pb); + unsigned b = avio_r8(pb); + gdv->pal[i] = 0xFF << 24 | r << 18 | g << 10 | b << 2; + } + } + + gdv->is_first_video = 1; + + return 0; +} + +static int gdv_read_packet(AVFormatContext *ctx, AVPacket *pkt) +{ + GDVContext *gdv = ctx->priv_data; + AVIOContext *pb = ctx->pb; + int ret; + + if (avio_feof(pb)) + return pb->error ? pb->error : AVERROR_EOF; + + if (gdv->audio_size && gdv->is_audio) { + ret = av_get_packet(pb, pkt, gdv->audio_size); + if (ret < 0) + return ret; + pkt->stream_index = 1; + gdv->is_audio = 0; + } else { + uint8_t *pal; + + if (avio_rl16(pb) != 0x1305) + return AVERROR_INVALIDDATA; + ret = av_get_packet(pb, pkt, 4 + avio_rl16(pb)); + if (ret < 0) + return ret; + pkt->stream_index = 0; + gdv->is_audio = 1; + + if (gdv->is_first_video) { + pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, + AVPALETTE_SIZE); + if (!pal) { + av_packet_unref(pkt); + return AVERROR(ENOMEM); + } + memcpy(pal, gdv->pal, AVPALETTE_SIZE); + pkt->flags |= AV_PKT_FLAG_KEY; + gdv->is_first_video = 0; + } + } + + return 0; +} + +AVInputFormat ff_gdv_demuxer = { + .name = "gdv", + .long_name = NULL_IF_CONFIG_SMALL("Gremlin Digital Video"), + .priv_data_size = sizeof(GDVContext), + .read_probe = gdv_read_probe, + .read_header = gdv_read_header, + .read_packet = gdv_read_packet, +}; diff --git a/libavformat/version.h b/libavformat/version.h index 411fd6613d..b00a8b0333 100644 --- a/libavformat/version.h +++ b/libavformat/version.h @@ -32,8 +32,8 @@ // Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium) // Also please add any ticket numbers that you believe might be affected here #define LIBAVFORMAT_VERSION_MAJOR 57 -#define LIBAVFORMAT_VERSION_MINOR 72 -#define LIBAVFORMAT_VERSION_MICRO 101 +#define LIBAVFORMAT_VERSION_MINOR 73 +#define LIBAVFORMAT_VERSION_MICRO 100 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \ LIBAVFORMAT_VERSION_MINOR, \ -- cgit v1.2.3