/* 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; ea->num_channels = 1; 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, };