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ffmpeg/libavformat/wc3movie.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +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 "libavutil/mem.h"
#include "avformat.h"
#include "demux.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_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_read_close(AVFormatContext *s)
{
Wc3DemuxContext *wc3 = s->priv_data;
av_packet_free(&wc3->vpkt);
return 0;
}
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;
wc3->vpkt = av_packet_alloc();
if (!wc3->vpkt)
return AVERROR(ENOMEM);
/* 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) {
av_freep(&buffer);
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->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
st->codecpar->bits_per_coded_sample = WC3_AUDIO_BITS;
st->codecpar->sample_rate = WC3_SAMPLE_RATE;
st->codecpar->bit_rate = st->codecpar->ch_layout.nb_channels * st->codecpar->sample_rate *
st->codecpar->bits_per_coded_sample;
st->codecpar->block_align = WC3_AUDIO_BITS * st->codecpar->ch_layout.nb_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;
av_packet_move_ref(pkt, wc3->vpkt);
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;
}
const FFInputFormat ff_wc3_demuxer = {
.p.name = "wc3movie",
.p.long_name = NULL_IF_CONFIG_SMALL("Wing Commander III movie"),
.priv_data_size = sizeof(Wc3DemuxContext),
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
.read_probe = wc3_probe,
.read_header = wc3_read_header,
.read_packet = wc3_read_packet,
.read_close = wc3_read_close,
};
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