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c636dc9819
FFmpeg/libavformat/wc3movie.c
Carl Eugen Hoyos 4d8875ec23 lavf: Constify the probe function argument. 
Reviewed-by: Lauri Kasanen
Reviewed-by: Tomas Härdin
2019-03-21 11:42:17 +01:00

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