mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
87e092348b
Signed-off-by: James Almer <jamrial@gmail.com>
480 lines
14 KiB
C
480 lines
14 KiB
C
/*
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* Digital Pictures SGA game demuxer
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*
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* Copyright (C) 2021 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 "libavutil/avassert.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/internal.h"
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#include "avformat.h"
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#include "internal.h"
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#include "avio_internal.h"
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#define SEGA_CD_PCM_NUM 12500000
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#define SEGA_CD_PCM_DEN 786432
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typedef struct SGADemuxContext {
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int video_stream_index;
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int audio_stream_index;
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uint8_t sector[65536 * 2];
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int sector_headers;
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int sample_rate;
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int first_audio_size;
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int payload_size;
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int packet_type;
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int flags;
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int idx;
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int left;
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int64_t pkt_pos;
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} SGADemuxContext;
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static int sga_probe(const AVProbeData *p)
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{
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const uint8_t *src = p->buf;
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int score = 0, sectors = 1;
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int last_left = 0;
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int sample_rate = -1;
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if (p->buf_size < 2048)
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return 0;
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for (int i = 0; i + 2 < p->buf_size; i += 2048) {
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int header = AV_RB16(src + i);
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if ((header > 0x07FE && header < 0x8100) ||
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(header > 0x8200 && header < 0xA100) ||
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(header > 0xA200 && header < 0xC100)) {
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sectors = 0;
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break;
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}
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}
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for (int i = 0; i + 4 < p->buf_size;) {
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int header = AV_RB16(src + i);
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int left = AV_RB16(src + i + 2);
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int offset, type, size;
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if (last_left < 0)
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return 0;
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if (sectors && header && last_left == 0) {
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if (header >> 12) {
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last_left = left;
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} else {
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last_left = left = header;
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}
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} else if (sectors && header) {
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left = header;
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last_left -= left;
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if (header != 0x7FE && left < 7)
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return 0;
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} else if (sectors) {
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if (left <= 8)
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return 0;
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i += sectors ? 2048 : left + 4;
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last_left = 0;
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continue;
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}
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if (sectors && (i > 0 && left < 0x7fe) &&
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(i + left + 14 < p->buf_size)) {
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offset = i + left + 2;
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} else if (sectors && i > 0) {
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i += 2048;
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last_left -= FFMIN(last_left, 2046);
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continue;
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} else {
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offset = 0;
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last_left = left;
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}
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header = AV_RB16(src + offset);
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size = AV_RB16(src + offset + 2) + 4;
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while ((header & 0xFF00) == 0) {
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offset++;
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if (offset + 4 >= p->buf_size)
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break;
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header = AV_RB16(src + offset);
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size = AV_RB16(src + offset + 2) + 4;
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}
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if (offset + 12 >= p->buf_size)
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break;
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if ((header & 0xFF) > 1)
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return 0;
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type = header >> 8;
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if (type == 0xAA ||
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type == 0xA1 ||
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type == 0xA2 ||
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type == 0xA3) {
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int new_rate;
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if (size <= 12)
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return 0;
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new_rate = AV_RB16(src + offset + 8);
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if (sample_rate < 0)
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sample_rate = new_rate;
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if (sample_rate == 0 || new_rate != sample_rate)
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return 0;
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if (src[offset + 10] != 1)
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return 0;
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score += 10;
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} else if (type == 0xC1 ||
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type == 0xC6 ||
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type == 0xC7 ||
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type == 0xC8 ||
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type == 0xC9 ||
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type == 0xCB ||
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type == 0xCD ||
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type == 0xE7) {
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int nb_pals = src[offset + 9];
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int tiles_w = src[offset + 10];
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int tiles_h = src[offset + 11];
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if (size <= 12)
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return 0;
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if (nb_pals == 0 || nb_pals > 4)
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return 0;
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if (tiles_w == 0 || tiles_w > 80)
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return 0;
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if (tiles_h == 0 || tiles_h > 60)
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return 0;
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score += 10;
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} else if (header == 0x7FE) {
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;
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} else {
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return 0;
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}
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i += sectors ? 2048 : size + 4;
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last_left -= FFMIN(last_left, 2046);
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if (score < 0)
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break;
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}
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return av_clip(score, 0, AVPROBE_SCORE_MAX);
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}
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static int sga_read_header(AVFormatContext *s)
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{
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SGADemuxContext *sga = s->priv_data;
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AVIOContext *pb = s->pb;
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sga->sector_headers = 1;
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sga->first_audio_size = 0;
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sga->video_stream_index = -1;
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sga->audio_stream_index = -1;
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sga->left = 2048;
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sga->idx = 0;
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
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while (!avio_feof(pb)) {
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int header = avio_rb16(pb);
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int type = header >> 8;
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int skip = 2046;
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int clock;
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if (!sga->first_audio_size &&
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(type == 0xAA ||
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type == 0xA1 ||
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type == 0xA2 ||
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type == 0xA3)) {
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sga->first_audio_size = avio_rb16(pb);
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avio_skip(pb, 4);
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clock = avio_rb16(pb);
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sga->sample_rate = av_rescale(clock,
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SEGA_CD_PCM_NUM,
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SEGA_CD_PCM_DEN);
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skip -= 8;
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}
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if ((header > 0x07FE && header < 0x8100) ||
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(header > 0x8200 && header < 0xA100) ||
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(header > 0xA200 && header < 0xC100)) {
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sga->sector_headers = 0;
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break;
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}
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avio_skip(pb, skip);
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}
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avio_seek(pb, 0, SEEK_SET);
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}
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return 0;
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}
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static void print_stats(AVFormatContext *s, const char *where)
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{
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SGADemuxContext *sga = s->priv_data;
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av_log(s, AV_LOG_DEBUG, "START %s\n", where);
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av_log(s, AV_LOG_DEBUG, "pos: %"PRIX64"\n", avio_tell(s->pb));
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av_log(s, AV_LOG_DEBUG, "idx: %X\n", sga->idx);
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av_log(s, AV_LOG_DEBUG, "packet_type: %X\n", sga->packet_type);
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av_log(s, AV_LOG_DEBUG, "payload_size: %X\n", sga->payload_size);
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av_log(s, AV_LOG_DEBUG, "SECTOR: %016"PRIX64"\n", AV_RB64(sga->sector));
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av_log(s, AV_LOG_DEBUG, "stream: %X\n", sga->sector[1]);
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av_log(s, AV_LOG_DEBUG, "END %s\n", where);
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}
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static void update_type_size(AVFormatContext *s)
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{
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SGADemuxContext *sga = s->priv_data;
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if (sga->idx >= 4) {
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sga->packet_type = sga->sector[0];
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sga->payload_size = AV_RB16(sga->sector + 2);
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} else {
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sga->packet_type = 0;
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sga->payload_size = 0;
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}
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}
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static int sga_video_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SGADemuxContext *sga = s->priv_data;
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int ret;
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if (sga->payload_size <= 8)
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return AVERROR_INVALIDDATA;
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if (sga->video_stream_index == -1) {
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AVRational frame_rate;
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->start_time = 0;
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_tag = 0;
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st->codecpar->codec_id = AV_CODEC_ID_SGA_VIDEO;
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sga->video_stream_index = st->index;
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if (sga->first_audio_size > 0 && sga->sample_rate > 0) {
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frame_rate.num = sga->sample_rate;
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frame_rate.den = sga->first_audio_size;
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} else {
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frame_rate.num = 15;
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frame_rate.den = 1;
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}
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avpriv_set_pts_info(st, 64, frame_rate.den, frame_rate.num);
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}
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ret = av_new_packet(pkt, sga->payload_size + 4);
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if (ret < 0)
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return AVERROR(ENOMEM);
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memcpy(pkt->data, sga->sector, sga->payload_size + 4);
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av_assert0(sga->idx >= sga->payload_size + 4);
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memmove(sga->sector, sga->sector + sga->payload_size + 4, sga->idx - sga->payload_size - 4);
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pkt->stream_index = sga->video_stream_index;
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pkt->duration = 1;
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pkt->pos = sga->pkt_pos;
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pkt->flags |= sga->flags;
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sga->idx -= sga->payload_size + 4;
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sga->flags = 0;
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update_type_size(s);
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av_log(s, AV_LOG_DEBUG, "VIDEO PACKET: %d:%016"PRIX64" i:%X\n", pkt->size, AV_RB64(sga->sector), sga->idx);
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return 0;
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}
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static int sga_audio_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SGADemuxContext *sga = s->priv_data;
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int ret;
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if (sga->payload_size <= 8)
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return AVERROR_INVALIDDATA;
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if (sga->audio_stream_index == -1) {
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->start_time = 0;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_tag = 0;
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st->codecpar->codec_id = AV_CODEC_ID_PCM_SGA;
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st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
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st->codecpar->sample_rate = av_rescale(AV_RB16(sga->sector + 8),
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SEGA_CD_PCM_NUM,
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SEGA_CD_PCM_DEN);
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sga->audio_stream_index = st->index;
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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}
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ret = av_new_packet(pkt, sga->payload_size - 8);
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if (ret < 0)
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return AVERROR(ENOMEM);
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memcpy(pkt->data, sga->sector + 12, sga->payload_size - 8);
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av_assert0(sga->idx >= sga->payload_size + 4);
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memmove(sga->sector, sga->sector + sga->payload_size + 4, sga->idx - sga->payload_size - 4);
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pkt->stream_index = sga->audio_stream_index;
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pkt->duration = pkt->size;
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pkt->pos = sga->pkt_pos;
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pkt->flags |= sga->flags;
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sga->idx -= sga->payload_size + 4;
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sga->flags = 0;
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update_type_size(s);
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av_log(s, AV_LOG_DEBUG, "AUDIO PACKET: %d:%016"PRIX64" i:%X\n", pkt->size, AV_RB64(sga->sector), sga->idx);
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return 0;
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}
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static int sga_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SGADemuxContext *sga = s->priv_data;
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int ret = 0;
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if (sga->packet_type == 0xCD ||
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sga->packet_type == 0xCB ||
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sga->packet_type == 0xC9 ||
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sga->packet_type == 0xC8 ||
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sga->packet_type == 0xC7 ||
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sga->packet_type == 0xC6 ||
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sga->packet_type == 0xC1 ||
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sga->packet_type == 0xE7) {
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ret = sga_video_packet(s, pkt);
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} else if (sga->packet_type == 0xA1 ||
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sga->packet_type == 0xA2 ||
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sga->packet_type == 0xA3 ||
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sga->packet_type == 0xAA) {
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ret = sga_audio_packet(s, pkt);
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} else {
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if (sga->idx == 0)
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return AVERROR_EOF;
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if (sga->sector[0])
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return AVERROR_INVALIDDATA;
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memmove(sga->sector, sga->sector + 1, sga->idx - 1);
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sga->idx--;
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return AVERROR(EAGAIN);
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}
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return ret;
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}
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static int try_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SGADemuxContext *sga = s->priv_data;
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int ret = AVERROR(EAGAIN);
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update_type_size(s);
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if (sga->idx >= sga->payload_size + 4) {
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print_stats(s, "before sga_packet");
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ret = sga_packet(s, pkt);
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print_stats(s, "after sga_packet");
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if (ret != AVERROR(EAGAIN))
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return ret;
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}
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return sga->idx < sga->payload_size + 4 ? AVERROR(EAGAIN) : ret;
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}
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static int sga_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SGADemuxContext *sga = s->priv_data;
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AVIOContext *pb = s->pb;
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int header, ret = 0;
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sga->pkt_pos = avio_tell(pb);
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retry:
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update_type_size(s);
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print_stats(s, "start");
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if (avio_feof(pb) &&
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(!sga->payload_size || sga->idx < sga->payload_size + 4))
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return AVERROR_EOF;
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if (sga->idx < sga->payload_size + 4) {
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ret = ffio_ensure_seekback(pb, 2);
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if (ret < 0)
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return ret;
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print_stats(s, "before read header");
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header = avio_rb16(pb);
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if (!header) {
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avio_skip(pb, 2046);
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sga->left = 0;
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} else if (!avio_feof(pb) &&
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((header >> 15) ||
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!sga->sector_headers)) {
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avio_seek(pb, -2, SEEK_CUR);
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sga->flags = AV_PKT_FLAG_KEY;
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sga->left = 2048;
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} else {
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sga->left = 2046;
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}
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av_assert0(sga->idx + sga->left < sizeof(sga->sector));
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ret = avio_read(pb, sga->sector + sga->idx, sga->left);
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if (ret > 0)
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sga->idx += ret;
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else if (ret != AVERROR_EOF && ret)
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return ret;
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print_stats(s, "after read header");
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update_type_size(s);
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}
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ret = try_packet(s, pkt);
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if (ret == AVERROR(EAGAIN))
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goto retry;
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return ret;
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}
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static int sga_seek(AVFormatContext *s, int stream_index,
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int64_t timestamp, int flags)
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{
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SGADemuxContext *sga = s->priv_data;
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sga->packet_type = sga->payload_size = sga->idx = 0;
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memset(sga->sector, 0, sizeof(sga->sector));
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return -1;
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}
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const AVInputFormat ff_sga_demuxer = {
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.name = "sga",
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.long_name = NULL_IF_CONFIG_SMALL("Digital Pictures SGA"),
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.priv_data_size = sizeof(SGADemuxContext),
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.read_probe = sga_probe,
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.read_header = sga_read_header,
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.read_packet = sga_read_packet,
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.read_seek = sga_seek,
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.extensions = "sga",
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.flags = AVFMT_GENERIC_INDEX,
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};
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