| /* |
| * 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(const AVProbeData *p) |
| { |
| if (AV_RL32(p->buf) == 0x29111994) |
| return AVPROBE_SCORE_MAX; |
| |
| return 0; |
| } |
| |
| static struct { |
| uint16_t id; |
| uint16_t width; |
| uint16_t height; |
| } FixedSize[] = { |
| { 0, 320, 200}, |
| { 1, 640, 200}, |
| { 2, 320, 167}, |
| { 3, 320, 180}, |
| { 4, 320, 400}, |
| { 5, 320, 170}, |
| { 6, 160, 85}, |
| { 7, 160, 83}, |
| { 8, 160, 90}, |
| { 9, 280, 128}, |
| {10, 320, 240}, |
| {11, 320, 201}, |
| {16, 640, 400}, |
| {17, 640, 200}, |
| {18, 640, 180}, |
| {19, 640, 167}, |
| {20, 640, 170}, |
| {21, 320, 240} |
| }; |
| |
| 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, size_id; |
| |
| avio_skip(pb, 4); |
| size_id = avio_rl16(pb); |
| |
| 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); |
| if (!fps) |
| return AVERROR_INVALIDDATA; |
| |
| 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; |
| } else { |
| avio_skip(pb, 2); |
| } |
| 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); |
| |
| if (vst->codecpar->width == 0 || vst->codecpar->height == 0) { |
| int i; |
| |
| for (i = 0; i < FF_ARRAY_ELEMS(FixedSize) - 1; i++) { |
| if (FixedSize[i].id == size_id) |
| break; |
| } |
| |
| vst->codecpar->width = FixedSize[i].width; |
| vst->codecpar->height = FixedSize[i].height; |
| } |
| |
| 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] = 0xFFU << 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) { |
| 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, |
| }; |