mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-28 12:16:12 +02:00
205 lines
5.4 KiB
C
205 lines
5.4 KiB
C
/*
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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(const 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 struct {
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uint16_t id;
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uint16_t width;
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uint16_t height;
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} FixedSize[] = {
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{ 0, 320, 200},
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{ 1, 640, 200},
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{ 2, 320, 167},
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{ 3, 320, 180},
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{ 4, 320, 400},
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{ 5, 320, 170},
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{ 6, 160, 85},
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{ 7, 160, 83},
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{ 8, 160, 90},
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{ 9, 280, 128},
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{10, 320, 240},
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{11, 320, 201},
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{16, 640, 400},
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{17, 640, 200},
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{18, 640, 180},
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{19, 640, 167},
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{20, 640, 170},
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{21, 320, 240}
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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, size_id;
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avio_skip(pb, 4);
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size_id = avio_rl16(pb);
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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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if (!fps)
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return AVERROR_INVALIDDATA;
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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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} else {
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avio_skip(pb, 2);
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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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if (vst->codecpar->width == 0 || vst->codecpar->height == 0) {
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(FixedSize) - 1; i++) {
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if (FixedSize[i].id == size_id)
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break;
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}
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vst->codecpar->width = FixedSize[i].width;
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vst->codecpar->height = FixedSize[i].height;
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}
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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] = 0xFFU << 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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