mirror of https://git.ffmpeg.org/ffmpeg.git
291 lines
8.3 KiB
C
291 lines
8.3 KiB
C
/* Electronic Arts Multimedia File Demuxer
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* Copyright (c) 2004 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 electronicarts.c
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* Electronic Arts Multimedia file demuxer (WVE/UV2/etc.)
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* by Robin Kay (komadori at gekkou.co.uk)
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*/
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#include "avformat.h"
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#define SCHl_TAG MKTAG('S', 'C', 'H', 'l')
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#define PT00_TAG MKTAG('P', 'T', 0x0, 0x0)
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#define GSTR_TAG MKTAG('G', 'S', 'T', 'R')
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#define SCDl_TAG MKTAG('S', 'C', 'D', 'l')
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#define SCEl_TAG MKTAG('S', 'C', 'E', 'l')
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#define MVhd_TAG MKTAG('M', 'V', 'h', 'd')
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#define MV0K_TAG MKTAG('M', 'V', '0', 'K')
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#define MV0F_TAG MKTAG('M', 'V', '0', 'F')
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#define EA_SAMPLE_RATE 22050
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#define EA_BITS_PER_SAMPLE 16
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#define EA_PREAMBLE_SIZE 8
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typedef struct EaDemuxContext {
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AVRational time_base;
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int video_stream_index;
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int audio_stream_index;
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int audio_frame_counter;
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int64_t audio_pts;
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int num_channels;
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int num_samples;
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int compression_type;
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} EaDemuxContext;
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static uint32_t read_arbitary(ByteIOContext *pb) {
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uint8_t size, byte;
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int i;
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uint32_t word;
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size = get_byte(pb);
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word = 0;
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for (i = 0; i < size; i++) {
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byte = get_byte(pb);
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word <<= 8;
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word |= byte;
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}
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return word;
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}
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/*
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* Process WVE file header
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* Returns 1 if the WVE file is valid and successfully opened, 0 otherwise
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*/
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static int process_ea_header(AVFormatContext *s) {
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int inHeader = 1;
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uint32_t blockid, size = 0;
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int num, den;
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EaDemuxContext *ea = s->priv_data;
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ByteIOContext *pb = &s->pb;
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blockid = get_le32(pb);
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if (blockid == MVhd_TAG) {
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size = get_le32(pb);
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url_fskip(pb, 16);
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den = get_le32(pb);
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num = get_le32(pb);
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ea->time_base = (AVRational) {num, den};
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url_fskip(pb, size-32);
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blockid = get_le32(pb);
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}
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if (blockid != SCHl_TAG)
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return 0;
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size += get_le32(pb);
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blockid = get_le32(pb);
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if (blockid == GSTR_TAG) {
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url_fskip(pb, 4);
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} else if (blockid != PT00_TAG) {
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av_log (s, AV_LOG_ERROR, "PT header missing\n");
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return 0;
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}
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while (inHeader) {
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int inSubheader;
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uint8_t byte;
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byte = get_byte(pb);
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switch (byte) {
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case 0xFD:
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av_log (s, AV_LOG_INFO, "entered audio subheader\n");
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inSubheader = 1;
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while (inSubheader) {
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uint8_t subbyte;
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subbyte = get_byte(pb);
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switch (subbyte) {
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case 0x82:
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ea->num_channels = read_arbitary(pb);
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av_log (s, AV_LOG_INFO, "num_channels (element 0x82) set to 0x%08x\n", ea->num_channels);
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break;
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case 0x83:
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ea->compression_type = read_arbitary(pb);
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av_log (s, AV_LOG_INFO, "compression_type (element 0x83) set to 0x%08x\n", ea->compression_type);
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break;
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case 0x85:
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ea->num_samples = read_arbitary(pb);
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av_log (s, AV_LOG_INFO, "num_samples (element 0x85) set to 0x%08x\n", ea->num_samples);
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break;
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case 0x8A:
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av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
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av_log (s, AV_LOG_INFO, "exited audio subheader\n");
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inSubheader = 0;
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break;
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case 0xFF:
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inSubheader = 0;
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inHeader = 0;
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break;
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default:
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av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
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break;
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}
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}
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break;
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case 0xFF:
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av_log (s, AV_LOG_INFO, "end of header block reached\n");
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inHeader = 0;
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break;
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default:
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av_log (s, AV_LOG_INFO, "header element 0x%02x set to 0x%08x\n", byte, read_arbitary(pb));
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break;
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}
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}
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/* skip to the start of the data */
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url_fseek(pb, size, SEEK_SET);
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return 1;
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}
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static int ea_probe(AVProbeData *p)
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{
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uint32_t tag;
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tag = AV_RL32(&p->buf[0]);
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if (tag == SCHl_TAG || tag == MVhd_TAG)
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int ea_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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EaDemuxContext *ea = s->priv_data;
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AVStream *st;
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if (!process_ea_header(s))
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return AVERROR(EIO);
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if (ea->time_base.num && ea->time_base.den) {
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/* initialize the video decoder stream */
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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ea->video_stream_index = st->index;
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st->codec->codec_type = CODEC_TYPE_VIDEO;
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st->codec->codec_id = CODEC_ID_VP6;
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st->codec->codec_tag = 0; /* no fourcc */
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st->codec->time_base = ea->time_base;
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}
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/* initialize the audio decoder stream */
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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av_set_pts_info(st, 33, 1, EA_SAMPLE_RATE);
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st->codec->codec_type = CODEC_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_ADPCM_EA;
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st->codec->codec_tag = 0; /* no tag */
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st->codec->channels = ea->num_channels;
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st->codec->sample_rate = EA_SAMPLE_RATE;
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st->codec->bits_per_sample = EA_BITS_PER_SAMPLE;
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st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
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st->codec->bits_per_sample / 4;
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st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
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ea->audio_stream_index = st->index;
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ea->audio_frame_counter = 0;
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return 1;
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}
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static int ea_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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EaDemuxContext *ea = s->priv_data;
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ByteIOContext *pb = &s->pb;
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int ret = 0;
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int packet_read = 0;
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unsigned char preamble[EA_PREAMBLE_SIZE];
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unsigned int chunk_type, chunk_size;
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int key = 0;
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while (!packet_read) {
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if (get_buffer(pb, preamble, EA_PREAMBLE_SIZE) != EA_PREAMBLE_SIZE)
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return AVERROR(EIO);
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chunk_type = AV_RL32(&preamble[0]);
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chunk_size = AV_RL32(&preamble[4]) - EA_PREAMBLE_SIZE;
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switch (chunk_type) {
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/* audio data */
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case SCDl_TAG:
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ret = av_get_packet(pb, pkt, chunk_size);
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if (ret != chunk_size)
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ret = AVERROR(EIO);
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else {
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pkt->stream_index = ea->audio_stream_index;
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pkt->pts = 90000;
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pkt->pts *= ea->audio_frame_counter;
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pkt->pts /= EA_SAMPLE_RATE;
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/* 2 samples/byte, 1 or 2 samples per frame depending
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* on stereo; chunk also has 12-byte header */
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ea->audio_frame_counter += ((chunk_size - 12) * 2) /
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ea->num_channels;
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}
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packet_read = 1;
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break;
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/* ending tag */
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case SCEl_TAG:
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ret = AVERROR(EIO);
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packet_read = 1;
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break;
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case MV0K_TAG:
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key = PKT_FLAG_KEY;
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case MV0F_TAG:
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ret = av_get_packet(pb, pkt, chunk_size);
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if (ret != chunk_size)
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ret = AVERROR_IO;
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else {
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pkt->stream_index = ea->video_stream_index;
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pkt->flags |= key;
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}
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packet_read = 1;
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break;
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default:
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url_fseek(pb, chunk_size, SEEK_CUR);
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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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AVInputFormat ea_demuxer = {
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"ea",
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"Electronic Arts Multimedia Format",
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sizeof(EaDemuxContext),
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ea_probe,
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ea_read_header,
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ea_read_packet,
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};
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