1 /* Electronic Arts Multimedia File Demuxer
2 * Copyright (c) 2004 The ffmpeg Project
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 * @file electronicarts.c
23 * Electronic Arts Multimedia file demuxer (WVE/UV2/etc.)
24 * by Robin Kay (komadori at gekkou.co.uk)
29 #define SCHl_TAG MKTAG('S', 'C', 'H', 'l')
30 #define PT00_TAG MKTAG('P', 'T', 0x0, 0x0)
31 #define SCDl_TAG MKTAG('S', 'C', 'D', 'l')
32 #define SCEl_TAG MKTAG('S', 'C', 'E', 'l')
34 #define EA_SAMPLE_RATE 22050
35 #define EA_BITS_PER_SAMPLE 16
36 #define EA_PREAMBLE_SIZE 8
38 typedef struct EaDemuxContext {
39 int video_stream_index;
41 int audio_stream_index;
42 int audio_frame_counter;
51 static uint32_t read_arbitary(ByteIOContext *pb) {
59 for (i = 0; i < size; i++) {
69 * Process WVE file header
70 * Returns 1 if the WVE file is valid and successfully opened, 0 otherwise
72 static int process_ea_header(AVFormatContext *s) {
74 uint32_t blockid, size;
75 EaDemuxContext *ea = s->priv_data;
76 ByteIOContext *pb = &s->pb;
78 if (get_le32(pb) != SCHl_TAG)
81 if (get_le32(pb) != PT00_TAG) {
82 av_log (s, AV_LOG_ERROR, "PT header missing\n");
93 av_log (s, AV_LOG_INFO, "entered audio subheader\n");
97 subbyte = get_byte(pb);
101 ea->num_channels = read_arbitary(pb);
102 av_log (s, AV_LOG_INFO, "num_channels (element 0x82) set to 0x%08x\n", ea->num_channels);
105 ea->compression_type = read_arbitary(pb);
106 av_log (s, AV_LOG_INFO, "compression_type (element 0x83) set to 0x%08x\n", ea->compression_type);
109 ea->num_samples = read_arbitary(pb);
110 av_log (s, AV_LOG_INFO, "num_samples (element 0x85) set to 0x%08x\n", ea->num_samples);
113 av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
114 av_log (s, AV_LOG_INFO, "exited audio subheader\n");
118 av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
124 av_log (s, AV_LOG_INFO, "end of header block reached\n");
128 av_log (s, AV_LOG_INFO, "header element 0x%02x set to 0x%08x\n", byte, read_arbitary(pb));
133 if ((ea->num_channels != 2) || (ea->compression_type != 7)) {
134 av_log (s, AV_LOG_ERROR, "unsupported stream type\n");
138 /* skip to the start of the data */
139 url_fseek(pb, size, SEEK_SET);
145 static int ea_probe(AVProbeData *p)
147 if (AV_RL32(&p->buf[0]) != SCHl_TAG)
150 return AVPROBE_SCORE_MAX;
153 static int ea_read_header(AVFormatContext *s,
154 AVFormatParameters *ap)
156 EaDemuxContext *ea = s->priv_data;
159 if (!process_ea_header(s))
163 /* initialize the video decoder stream */
164 st = av_new_stream(s, 0);
166 return AVERROR(ENOMEM);
167 av_set_pts_info(st, 33, 1, 90000);
168 ea->video_stream_index = st->index;
169 st->codec->codec_type = CODEC_TYPE_VIDEO;
170 st->codec->codec_id = CODEC_ID_EA_MJPEG;
171 st->codec->codec_tag = 0; /* no fourcc */
174 /* initialize the audio decoder stream */
175 st = av_new_stream(s, 0);
177 return AVERROR(ENOMEM);
178 av_set_pts_info(st, 33, 1, EA_SAMPLE_RATE);
179 st->codec->codec_type = CODEC_TYPE_AUDIO;
180 st->codec->codec_id = CODEC_ID_ADPCM_EA;
181 st->codec->codec_tag = 0; /* no tag */
182 st->codec->channels = ea->num_channels;
183 st->codec->sample_rate = EA_SAMPLE_RATE;
184 st->codec->bits_per_sample = EA_BITS_PER_SAMPLE;
185 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
186 st->codec->bits_per_sample / 4;
187 st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
189 ea->audio_stream_index = st->index;
190 ea->audio_frame_counter = 0;
195 static int ea_read_packet(AVFormatContext *s,
198 EaDemuxContext *ea = s->priv_data;
199 ByteIOContext *pb = &s->pb;
202 unsigned char preamble[EA_PREAMBLE_SIZE];
203 unsigned int chunk_type, chunk_size;
205 while (!packet_read) {
207 if (get_buffer(pb, preamble, EA_PREAMBLE_SIZE) != EA_PREAMBLE_SIZE)
209 chunk_type = AV_RL32(&preamble[0]);
210 chunk_size = AV_RL32(&preamble[4]) - EA_PREAMBLE_SIZE;
212 switch (chunk_type) {
215 ret = av_get_packet(pb, pkt, chunk_size);
216 if (ret != chunk_size)
219 pkt->stream_index = ea->audio_stream_index;
221 pkt->pts *= ea->audio_frame_counter;
222 pkt->pts /= EA_SAMPLE_RATE;
224 /* 2 samples/byte, 1 or 2 samples per frame depending
225 * on stereo; chunk also has 12-byte header */
226 ea->audio_frame_counter += ((chunk_size - 12) * 2) /
240 url_fseek(pb, chunk_size, SEEK_CUR);
248 AVInputFormat ea_demuxer = {
250 "Electronic Arts Multimedia Format",
251 sizeof(EaDemuxContext),