mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
290 lines
8.0 KiB
C
290 lines
8.0 KiB
C
/* Electronic Arts Multimedia File Demuxer
|
|
* Copyright (c) 2004 The ffmpeg Project
|
|
*
|
|
* This library 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file electronicarts.c
|
|
* Electronic Arts Multimedia file demuxer (WVE/UV2/etc.)
|
|
* by Robin Kay (komadori at gekkou.co.uk)
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
|
|
#define SCHl_TAG MKTAG('S', 'C', 'H', 'l')
|
|
#define PT00_TAG MKTAG('P', 'T', 0x0, 0x0)
|
|
#define SCDl_TAG MKTAG('S', 'C', 'D', 'l')
|
|
#define pIQT_TAG MKTAG('p', 'I', 'Q', 'T')
|
|
#define SCEl_TAG MKTAG('S', 'C', 'E', 'l')
|
|
#define _TAG MKTAG('', '', '', '')
|
|
|
|
#define EA_SAMPLE_RATE 22050
|
|
#define EA_BITS_PER_SAMPLE 16
|
|
#define EA_PREAMBLE_SIZE 8
|
|
|
|
typedef struct EaDemuxContext {
|
|
int width;
|
|
int height;
|
|
int video_stream_index;
|
|
int track_count;
|
|
|
|
int audio_stream_index;
|
|
int audio_frame_counter;
|
|
|
|
int64_t audio_pts;
|
|
int64_t video_pts;
|
|
int video_pts_inc;
|
|
float fps;
|
|
|
|
int num_channels;
|
|
int num_samples;
|
|
int compression_type;
|
|
} EaDemuxContext;
|
|
|
|
static uint32_t read_arbitary(ByteIOContext *pb) {
|
|
uint8_t size, byte;
|
|
int i;
|
|
uint32_t word;
|
|
|
|
size = get_byte(pb);
|
|
|
|
word = 0;
|
|
for (i = 0; i < size; i++) {
|
|
byte = get_byte(pb);
|
|
word <<= 8;
|
|
word |= byte;
|
|
}
|
|
|
|
return word;
|
|
}
|
|
|
|
/*
|
|
* Process WVE file header
|
|
* Returns 1 if the WVE file is valid and successfully opened, 0 otherwise
|
|
*/
|
|
static int process_ea_header(AVFormatContext *s) {
|
|
int inHeader;
|
|
uint32_t blockid, size;
|
|
EaDemuxContext *ea = (EaDemuxContext *)s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
|
|
if (get_buffer(pb, (void*)&blockid, 4) != 4) {
|
|
return 0;
|
|
}
|
|
if (le2me_32(blockid) != SCHl_TAG) {
|
|
return 0;
|
|
}
|
|
|
|
if (get_buffer(pb, (void*)&size, 4) != 4) {
|
|
return 0;
|
|
}
|
|
size = le2me_32(size);
|
|
|
|
if (get_buffer(pb, (void*)&blockid, 4) != 4) {
|
|
return 0;
|
|
}
|
|
if (le2me_32(blockid) != PT00_TAG) {
|
|
av_log (s, AV_LOG_ERROR, "PT header missing\n");
|
|
return 0;
|
|
}
|
|
|
|
inHeader = 1;
|
|
while (inHeader) {
|
|
int inSubheader;
|
|
uint8_t byte;
|
|
byte = get_byte(pb) & 0xFF;
|
|
|
|
switch (byte) {
|
|
case 0xFD:
|
|
av_log (s, AV_LOG_INFO, "entered audio subheader\n");
|
|
inSubheader = 1;
|
|
while (inSubheader) {
|
|
uint8_t subbyte;
|
|
subbyte = get_byte(pb) & 0xFF;
|
|
|
|
switch (subbyte) {
|
|
case 0x82:
|
|
ea->num_channels = read_arbitary(pb);
|
|
av_log (s, AV_LOG_INFO, "num_channels (element 0x82) set to 0x%08x\n", ea->num_channels);
|
|
break;
|
|
case 0x83:
|
|
ea->compression_type = read_arbitary(pb);
|
|
av_log (s, AV_LOG_INFO, "compression_type (element 0x83) set to 0x%08x\n", ea->compression_type);
|
|
break;
|
|
case 0x85:
|
|
ea->num_samples = read_arbitary(pb);
|
|
av_log (s, AV_LOG_INFO, "num_samples (element 0x85) set to 0x%08x\n", ea->num_samples);
|
|
break;
|
|
case 0x8A:
|
|
av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
|
|
av_log (s, AV_LOG_INFO, "exited audio subheader\n");
|
|
inSubheader = 0;
|
|
break;
|
|
default:
|
|
av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case 0xFF:
|
|
av_log (s, AV_LOG_INFO, "end of header block reached\n");
|
|
inHeader = 0;
|
|
break;
|
|
default:
|
|
av_log (s, AV_LOG_INFO, "header element 0x%02x set to 0x%08x\n", byte, read_arbitary(pb));
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ((ea->num_channels != 2) || (ea->compression_type != 7)) {
|
|
av_log (s, AV_LOG_ERROR, "unsupported stream type\n");
|
|
return 0;
|
|
}
|
|
|
|
/* skip to the start of the data */
|
|
url_fseek(pb, size, SEEK_SET);
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int ea_probe(AVProbeData *p)
|
|
{
|
|
if (p->buf_size < 4)
|
|
return 0;
|
|
|
|
if (LE_32(&p->buf[0]) != SCHl_TAG)
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int ea_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
EaDemuxContext *ea = (EaDemuxContext *)s->priv_data;
|
|
AVStream *st;
|
|
|
|
if (!process_ea_header(s))
|
|
return AVERROR_IO;
|
|
|
|
#if 0
|
|
/* initialize the video decoder stream */
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR_NOMEM;
|
|
av_set_pts_info(st, 33, 1, 90000);
|
|
ea->video_stream_index = st->index;
|
|
st->codec->codec_type = CODEC_TYPE_VIDEO;
|
|
st->codec->codec_id = CODEC_ID_EA_MJPEG;
|
|
st->codec->codec_tag = 0; /* no fourcc */
|
|
#endif
|
|
|
|
/* initialize the audio decoder stream */
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR_NOMEM;
|
|
av_set_pts_info(st, 33, 1, EA_SAMPLE_RATE);
|
|
st->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
st->codec->codec_id = CODEC_ID_ADPCM_EA;
|
|
st->codec->codec_tag = 0; /* no tag */
|
|
st->codec->channels = ea->num_channels;
|
|
st->codec->sample_rate = EA_SAMPLE_RATE;
|
|
st->codec->bits_per_sample = EA_BITS_PER_SAMPLE;
|
|
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
|
|
st->codec->bits_per_sample / 4;
|
|
st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
|
|
|
|
ea->audio_stream_index = st->index;
|
|
ea->audio_frame_counter = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int ea_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
EaDemuxContext *ea = s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
int ret = 0;
|
|
int packet_read = 0;
|
|
unsigned char preamble[EA_PREAMBLE_SIZE];
|
|
unsigned int chunk_type, chunk_size;
|
|
|
|
while (!packet_read) {
|
|
|
|
if (get_buffer(pb, preamble, EA_PREAMBLE_SIZE) != EA_PREAMBLE_SIZE)
|
|
return AVERROR_IO;
|
|
chunk_type = LE_32(&preamble[0]);
|
|
chunk_size = LE_32(&preamble[4]) - EA_PREAMBLE_SIZE;
|
|
|
|
switch (chunk_type) {
|
|
/* audio data */
|
|
case SCDl_TAG:
|
|
ret = av_get_packet(pb, pkt, chunk_size);
|
|
if (ret != chunk_size)
|
|
ret = AVERROR_IO;
|
|
else {
|
|
pkt->stream_index = ea->audio_stream_index;
|
|
pkt->pts = 90000;
|
|
pkt->pts *= ea->audio_frame_counter;
|
|
pkt->pts /= EA_SAMPLE_RATE;
|
|
|
|
/* 2 samples/byte, 1 or 2 samples per frame depending
|
|
* on stereo; chunk also has 12-byte header */
|
|
ea->audio_frame_counter += ((chunk_size - 12) * 2) /
|
|
ea->num_channels;
|
|
}
|
|
|
|
packet_read = 1;
|
|
break;
|
|
|
|
/* ending tag */
|
|
case SCEl_TAG:
|
|
ret = AVERROR_IO;
|
|
packet_read = 1;
|
|
break;
|
|
|
|
default:
|
|
url_fseek(pb, chunk_size, SEEK_CUR);
|
|
break;
|
|
}
|
|
|
|
/* ending packet */
|
|
if (chunk_type == SCEl_TAG) {
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ea_read_close(AVFormatContext *s)
|
|
{
|
|
// EaDemuxContext *ea = (EaDemuxContext *)s->priv_data;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ea_demuxer = {
|
|
"ea",
|
|
"Electronic Arts Multimedia Format",
|
|
sizeof(EaDemuxContext),
|
|
ea_probe,
|
|
ea_read_header,
|
|
ea_read_packet,
|
|
ea_read_close,
|
|
};
|