ffmpeg/libavformat/electronicarts.c

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/* Electronic Arts Multimedia File Demuxer
* Copyright (c) 2004 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 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 GSTR_TAG MKTAG('G', 'S', 'T', 'R')
#define SCDl_TAG MKTAG('S', 'C', 'D', 'l')
#define SCEl_TAG MKTAG('S', 'C', 'E', 'l')
#define MVhd_TAG MKTAG('M', 'V', 'h', 'd')
#define MV0K_TAG MKTAG('M', 'V', '0', 'K')
#define MV0F_TAG MKTAG('M', 'V', '0', 'F')
#define EA_SAMPLE_RATE 22050
#define EA_BITS_PER_SAMPLE 16
#define EA_PREAMBLE_SIZE 8
typedef struct EaDemuxContext {
AVRational time_base;
int video_stream_index;
int audio_stream_index;
int audio_frame_counter;
int64_t audio_pts;
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 PT/GSTR sound header
* return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
*/
static int process_audio_header_elements(AVFormatContext *s)
{
int inHeader = 1;
EaDemuxContext *ea = s->priv_data;
ByteIOContext *pb = &s->pb;
while (inHeader) {
int inSubheader;
uint8_t byte;
byte = get_byte(pb);
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);
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;
case 0xFF:
av_log (s, AV_LOG_INFO, "end of header block reached (within audio subheader)\n");
inSubheader = 0;
inHeader = 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;
}
}
return 1;
}
/*
* Process EA file header
* Returns 1 if the EA file is valid and successfully opened, 0 otherwise
*/
static int process_ea_header(AVFormatContext *s) {
uint32_t blockid, size = 0;
int num, den;
EaDemuxContext *ea = s->priv_data;
ByteIOContext *pb = &s->pb;
blockid = get_le32(pb);
if (blockid == MVhd_TAG) {
size = get_le32(pb);
url_fskip(pb, 16);
den = get_le32(pb);
num = get_le32(pb);
ea->time_base = (AVRational) {num, den};
url_fskip(pb, size-32);
blockid = get_le32(pb);
}
if (blockid != SCHl_TAG)
return 0;
size += get_le32(pb);
blockid = get_le32(pb);
if (blockid == GSTR_TAG) {
url_fskip(pb, 4);
} else if (blockid != PT00_TAG) {
av_log (s, AV_LOG_ERROR, "PT header missing\n");
return 0;
}
process_audio_header_elements(s);
/* skip to the start of the data */
url_fseek(pb, size, SEEK_SET);
return 1;
}
static int ea_probe(AVProbeData *p)
{
uint32_t tag;
tag = AV_RL32(&p->buf[0]);
if (tag == SCHl_TAG || tag == MVhd_TAG)
return AVPROBE_SCORE_MAX;
return 0;
}
static int ea_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
EaDemuxContext *ea = s->priv_data;
AVStream *st;
if (!process_ea_header(s))
return AVERROR(EIO);
if (ea->time_base.num && ea->time_base.den) {
/* initialize the video decoder stream */
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
ea->video_stream_index = st->index;
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_VP6;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->time_base = ea->time_base;
}
/* initialize the audio decoder stream */
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
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;
int key = 0;
while (!packet_read) {
if (get_buffer(pb, preamble, EA_PREAMBLE_SIZE) != EA_PREAMBLE_SIZE)
return AVERROR(EIO);
chunk_type = AV_RL32(&preamble[0]);
chunk_size = AV_RL32(&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(EIO);
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(EIO);
packet_read = 1;
break;
case MV0K_TAG:
key = PKT_FLAG_KEY;
case MV0F_TAG:
ret = av_get_packet(pb, pkt, chunk_size);
if (ret != chunk_size)
ret = AVERROR_IO;
else {
pkt->stream_index = ea->video_stream_index;
pkt->flags |= key;
}
packet_read = 1;
break;
default:
url_fseek(pb, chunk_size, SEEK_CUR);
break;
}
}
return ret;
}
AVInputFormat ea_demuxer = {
"ea",
"Electronic Arts Multimedia Format",
sizeof(EaDemuxContext),
ea_probe,
ea_read_header,
ea_read_packet,
};