mirror of
https://gitee.com/openharmony/third_party_ffmpeg
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306 lines
9.1 KiB
C
306 lines
9.1 KiB
C
/*
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* Wing Commander III Movie (.mve) File Demuxer
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* Copyright (c) 2003 The FFmpeg project
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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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/**
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* @file
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* Wing Commander III Movie file demuxer
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* by Mike Melanson (melanson@pcisys.net)
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* for more information on the WC3 .mve file format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/dict.h"
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#include "avformat.h"
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#include "internal.h"
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#define FORM_TAG MKTAG('F', 'O', 'R', 'M')
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#define MOVE_TAG MKTAG('M', 'O', 'V', 'E')
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#define PC__TAG MKTAG('_', 'P', 'C', '_')
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#define SOND_TAG MKTAG('S', 'O', 'N', 'D')
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#define BNAM_TAG MKTAG('B', 'N', 'A', 'M')
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#define SIZE_TAG MKTAG('S', 'I', 'Z', 'E')
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#define PALT_TAG MKTAG('P', 'A', 'L', 'T')
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#define INDX_TAG MKTAG('I', 'N', 'D', 'X')
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#define BRCH_TAG MKTAG('B', 'R', 'C', 'H')
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#define SHOT_TAG MKTAG('S', 'H', 'O', 'T')
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#define VGA__TAG MKTAG('V', 'G', 'A', ' ')
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#define TEXT_TAG MKTAG('T', 'E', 'X', 'T')
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#define AUDI_TAG MKTAG('A', 'U', 'D', 'I')
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/* video resolution unless otherwise specified */
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#define WC3_DEFAULT_WIDTH 320
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#define WC3_DEFAULT_HEIGHT 165
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/* always use the same PCM audio parameters */
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#define WC3_SAMPLE_RATE 22050
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#define WC3_AUDIO_CHANNELS 1
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#define WC3_AUDIO_BITS 16
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/* nice, constant framerate */
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#define WC3_FRAME_FPS 15
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#define PALETTE_SIZE (256 * 3)
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typedef struct Wc3DemuxContext {
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int width;
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int height;
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int64_t pts;
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int video_stream_index;
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int audio_stream_index;
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AVPacket vpkt;
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} Wc3DemuxContext;
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static int wc3_probe(AVProbeData *p)
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{
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if (p->buf_size < 12)
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return 0;
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if ((AV_RL32(&p->buf[0]) != FORM_TAG) ||
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(AV_RL32(&p->buf[8]) != MOVE_TAG))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int wc3_read_header(AVFormatContext *s)
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{
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Wc3DemuxContext *wc3 = s->priv_data;
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AVIOContext *pb = s->pb;
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unsigned int fourcc_tag;
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unsigned int size;
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AVStream *st;
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int ret = 0;
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char *buffer;
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/* default context members */
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wc3->width = WC3_DEFAULT_WIDTH;
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wc3->height = WC3_DEFAULT_HEIGHT;
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wc3->pts = 0;
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wc3->video_stream_index = wc3->audio_stream_index = 0;
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av_init_packet(&wc3->vpkt);
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wc3->vpkt.data = NULL; wc3->vpkt.size = 0;
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/* skip the first 3 32-bit numbers */
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avio_skip(pb, 12);
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/* traverse through the chunks and load the header information before
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* the first BRCH tag */
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fourcc_tag = avio_rl32(pb);
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size = (avio_rb32(pb) + 1) & (~1);
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do {
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switch (fourcc_tag) {
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case SOND_TAG:
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case INDX_TAG:
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/* SOND unknown, INDX unnecessary; ignore both */
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avio_skip(pb, size);
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break;
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case PC__TAG:
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/* number of palettes, unneeded */
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avio_skip(pb, 12);
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break;
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case BNAM_TAG:
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/* load up the name */
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buffer = av_malloc(size+1);
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if (!buffer)
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return AVERROR(ENOMEM);
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if ((ret = avio_read(pb, buffer, size)) != size)
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return AVERROR(EIO);
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buffer[size] = 0;
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av_dict_set(&s->metadata, "title", buffer,
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AV_DICT_DONT_STRDUP_VAL);
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break;
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case SIZE_TAG:
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/* video resolution override */
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wc3->width = avio_rl32(pb);
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wc3->height = avio_rl32(pb);
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break;
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case PALT_TAG:
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/* one of several palettes */
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avio_seek(pb, -8, SEEK_CUR);
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av_append_packet(pb, &wc3->vpkt, 8 + PALETTE_SIZE);
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break;
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default:
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av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
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av_fourcc2str(fourcc_tag));
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return AVERROR_INVALIDDATA;
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}
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fourcc_tag = avio_rl32(pb);
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/* chunk sizes are 16-bit aligned */
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size = (avio_rb32(pb) + 1) & (~1);
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if (avio_feof(pb))
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return AVERROR(EIO);
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} while (fourcc_tag != BRCH_TAG);
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/* initialize the decoder streams */
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);
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wc3->video_stream_index = st->index;
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_XAN_WC3;
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st->codecpar->codec_tag = 0; /* no fourcc */
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st->codecpar->width = wc3->width;
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st->codecpar->height = wc3->height;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);
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wc3->audio_stream_index = st->index;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
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st->codecpar->codec_tag = 1;
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st->codecpar->channels = WC3_AUDIO_CHANNELS;
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st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
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st->codecpar->bits_per_coded_sample = WC3_AUDIO_BITS;
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st->codecpar->sample_rate = WC3_SAMPLE_RATE;
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st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
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st->codecpar->bits_per_coded_sample;
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st->codecpar->block_align = WC3_AUDIO_BITS * WC3_AUDIO_CHANNELS;
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return 0;
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}
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static int wc3_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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Wc3DemuxContext *wc3 = s->priv_data;
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AVIOContext *pb = s->pb;
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unsigned int fourcc_tag;
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unsigned int size;
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int packet_read = 0;
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int ret = 0;
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unsigned char text[1024];
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while (!packet_read) {
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fourcc_tag = avio_rl32(pb);
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/* chunk sizes are 16-bit aligned */
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size = (avio_rb32(pb) + 1) & (~1);
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if (avio_feof(pb))
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return AVERROR(EIO);
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switch (fourcc_tag) {
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case BRCH_TAG:
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/* no-op */
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break;
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case SHOT_TAG:
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/* load up new palette */
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avio_seek(pb, -8, SEEK_CUR);
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av_append_packet(pb, &wc3->vpkt, 8 + 4);
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break;
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case VGA__TAG:
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/* send out video chunk */
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avio_seek(pb, -8, SEEK_CUR);
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ret= av_append_packet(pb, &wc3->vpkt, 8 + size);
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// ignore error if we have some data
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if (wc3->vpkt.size > 0)
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ret = 0;
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*pkt = wc3->vpkt;
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wc3->vpkt.data = NULL; wc3->vpkt.size = 0;
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pkt->stream_index = wc3->video_stream_index;
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pkt->pts = wc3->pts;
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packet_read = 1;
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break;
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case TEXT_TAG:
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/* subtitle chunk */
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if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size)
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ret = AVERROR(EIO);
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else {
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int i = 0;
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av_log (s, AV_LOG_DEBUG, "Subtitle time!\n");
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if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
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return AVERROR_INVALIDDATA;
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av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]);
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i += text[i] + 1;
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if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
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return AVERROR_INVALIDDATA;
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av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]);
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i += text[i] + 1;
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if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
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return AVERROR_INVALIDDATA;
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av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]);
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}
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break;
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case AUDI_TAG:
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/* send out audio chunk */
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ret= av_get_packet(pb, pkt, size);
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pkt->stream_index = wc3->audio_stream_index;
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pkt->pts = wc3->pts;
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/* time to advance pts */
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wc3->pts++;
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packet_read = 1;
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break;
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default:
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av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
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av_fourcc2str(fourcc_tag));
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ret = AVERROR_INVALIDDATA;
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packet_read = 1;
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break;
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}
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}
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return ret;
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}
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static int wc3_read_close(AVFormatContext *s)
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{
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Wc3DemuxContext *wc3 = s->priv_data;
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if (wc3->vpkt.size > 0)
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av_packet_unref(&wc3->vpkt);
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return 0;
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}
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AVInputFormat ff_wc3_demuxer = {
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.name = "wc3movie",
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.long_name = NULL_IF_CONFIG_SMALL("Wing Commander III movie"),
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.priv_data_size = sizeof(Wc3DemuxContext),
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.read_probe = wc3_probe,
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.read_header = wc3_read_header,
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.read_packet = wc3_read_packet,
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.read_close = wc3_read_close,
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};
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