mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Paul B Mahol <onemda@gmail.com>pull/262/head
Paul B Mahol
8 years ago
parent
d1c08027d8
commit
c948414876
5 changed files with 166 additions and 2 deletions
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/*
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* Gremlin Digital Video demuxer |
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* Copyright (c) 2017 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "avio.h" |
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#include "internal.h" |
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typedef struct GDVContext { |
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int is_first_video; |
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int is_audio; |
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int audio_size; |
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int audio_stream_index; |
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int video_stream_index; |
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unsigned pal[256]; |
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} GDVContext; |
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static int gdv_read_probe(AVProbeData *p) |
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{ |
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if (AV_RL32(p->buf) == 0x29111994) |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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static int gdv_read_header(AVFormatContext *ctx) |
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{ |
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GDVContext *gdv = ctx->priv_data; |
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AVIOContext *pb = ctx->pb; |
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AVStream *vst, *ast; |
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unsigned fps, snd_flags, vid_depth; |
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avio_skip(pb, 6); |
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vst = avformat_new_stream(ctx, 0); |
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if (!vst) |
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return AVERROR(ENOMEM); |
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vst->start_time = 0; |
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vst->duration = |
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vst->nb_frames = avio_rl16(pb); |
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fps = avio_rl16(pb); |
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snd_flags = avio_rl16(pb); |
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if (snd_flags & 1) { |
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ast = avformat_new_stream(ctx, 0); |
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if (!ast) |
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return AVERROR(ENOMEM); |
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ast->start_time = 0; |
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ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
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ast->codecpar->codec_tag = 0; |
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ast->codecpar->sample_rate = avio_rl16(pb); |
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ast->codecpar->channels = 1 + !!(snd_flags & 2); |
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if (snd_flags & 8) { |
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ast->codecpar->codec_id = AV_CODEC_ID_GREMLIN_DPCM; |
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} else { |
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ast->codecpar->codec_id = (snd_flags & 4) ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_U8; |
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} |
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avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate); |
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gdv->audio_size = (ast->codecpar->sample_rate / fps) * |
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ast->codecpar->channels * (1 + !!(snd_flags & 4)) / (1 + !!(snd_flags & 8)); |
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gdv->is_audio = 1; |
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} |
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vid_depth = avio_rl16(pb); |
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avio_skip(pb, 4); |
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vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
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vst->codecpar->codec_id = AV_CODEC_ID_GDV; |
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vst->codecpar->codec_tag = 0; |
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vst->codecpar->width = avio_rl16(pb); |
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vst->codecpar->height = avio_rl16(pb); |
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avpriv_set_pts_info(vst, 64, 1, fps); |
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if (vid_depth & 1) { |
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int i; |
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for (i = 0; i < 256; i++) { |
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unsigned r = avio_r8(pb); |
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unsigned g = avio_r8(pb); |
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unsigned b = avio_r8(pb); |
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gdv->pal[i] = 0xFF << 24 | r << 18 | g << 10 | b << 2; |
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} |
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} |
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gdv->is_first_video = 1; |
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return 0; |
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} |
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static int gdv_read_packet(AVFormatContext *ctx, AVPacket *pkt) |
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{ |
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GDVContext *gdv = ctx->priv_data; |
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AVIOContext *pb = ctx->pb; |
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int ret; |
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if (avio_feof(pb)) |
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return pb->error ? pb->error : AVERROR_EOF; |
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if (gdv->audio_size && gdv->is_audio) { |
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ret = av_get_packet(pb, pkt, gdv->audio_size); |
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if (ret < 0) |
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return ret; |
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pkt->stream_index = 1; |
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gdv->is_audio = 0; |
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} else { |
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uint8_t *pal; |
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if (avio_rl16(pb) != 0x1305) |
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return AVERROR_INVALIDDATA; |
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ret = av_get_packet(pb, pkt, 4 + avio_rl16(pb)); |
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if (ret < 0) |
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return ret; |
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pkt->stream_index = 0; |
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gdv->is_audio = 1; |
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if (gdv->is_first_video) { |
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pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, |
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AVPALETTE_SIZE); |
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if (!pal) { |
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av_packet_unref(pkt); |
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return AVERROR(ENOMEM); |
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} |
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memcpy(pal, gdv->pal, AVPALETTE_SIZE); |
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pkt->flags |= AV_PKT_FLAG_KEY; |
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gdv->is_first_video = 0; |
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} |
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} |
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return 0; |
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} |
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AVInputFormat ff_gdv_demuxer = { |
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.name = "gdv", |
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.long_name = NULL_IF_CONFIG_SMALL("Gremlin Digital Video"), |
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.priv_data_size = sizeof(GDVContext), |
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.read_probe = gdv_read_probe, |
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.read_header = gdv_read_header, |
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.read_packet = gdv_read_packet, |
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}; |
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