2 * 4X Technologies .4xm File Demuxer (no muxer)
3 * Copyright (c) 2003 The ffmpeg Project
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * 4X Technologies file demuxer
25 * by Mike Melanson (melanson@pcisys.net)
26 * for more information on the .4xm file format, visit:
27 * http://www.pcisys.net/~melanson/codecs/
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/intfloat.h"
35 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
36 #define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V')
37 #define LIST_TAG MKTAG('L', 'I', 'S', 'T')
38 #define HEAD_TAG MKTAG('H', 'E', 'A', 'D')
39 #define TRK__TAG MKTAG('T', 'R', 'K', '_')
40 #define MOVI_TAG MKTAG('M', 'O', 'V', 'I')
41 #define VTRK_TAG MKTAG('V', 'T', 'R', 'K')
42 #define STRK_TAG MKTAG('S', 'T', 'R', 'K')
43 #define std__TAG MKTAG('s', 't', 'd', '_')
44 #define name_TAG MKTAG('n', 'a', 'm', 'e')
45 #define vtrk_TAG MKTAG('v', 't', 'r', 'k')
46 #define strk_TAG MKTAG('s', 't', 'r', 'k')
47 #define ifrm_TAG MKTAG('i', 'f', 'r', 'm')
48 #define pfrm_TAG MKTAG('p', 'f', 'r', 'm')
49 #define cfrm_TAG MKTAG('c', 'f', 'r', 'm')
50 #define ifr2_TAG MKTAG('i', 'f', 'r', '2')
51 #define pfr2_TAG MKTAG('p', 'f', 'r', '2')
52 #define cfr2_TAG MKTAG('c', 'f', 'r', '2')
53 #define snd__TAG MKTAG('s', 'n', 'd', '_')
55 #define vtrk_SIZE 0x44
56 #define strk_SIZE 0x28
58 #define GET_LIST_HEADER() \
59 fourcc_tag = avio_rl32(pb); \
60 size = avio_rl32(pb); \
61 if (fourcc_tag != LIST_TAG) \
62 return AVERROR_INVALIDDATA; \
63 fourcc_tag = avio_rl32(pb);
65 typedef struct AudioTrack {
74 typedef struct FourxmDemuxContext {
75 int video_stream_index;
83 static int fourxm_probe(AVProbeData *p)
85 if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
86 (AV_RL32(&p->buf[8]) != FOURXMV_TAG))
89 return AVPROBE_SCORE_MAX;
92 static int parse_vtrk(AVFormatContext *s,
93 FourxmDemuxContext *fourxm, uint8_t *buf, int size,
97 /* check that there is enough data */
98 if (size != vtrk_SIZE || left < size + 8) {
99 return AVERROR_INVALIDDATA;
102 /* allocate a new AVStream */
103 st = avformat_new_stream(s, NULL);
105 return AVERROR(ENOMEM);
107 avpriv_set_pts_info(st, 60, 1, fourxm->fps);
109 fourxm->video_stream_index = st->index;
111 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
112 st->codec->codec_id = AV_CODEC_ID_4XM;
113 st->codec->extradata_size = 4;
114 st->codec->extradata = av_malloc(4);
115 AV_WL32(st->codec->extradata, AV_RL32(buf + 16));
116 st->codec->width = AV_RL32(buf + 36);
117 st->codec->height = AV_RL32(buf + 40);
123 static int parse_strk(AVFormatContext *s,
124 FourxmDemuxContext *fourxm, uint8_t *buf, int size,
129 /* check that there is enough data */
130 if (size != strk_SIZE || left < size + 8)
131 return AVERROR_INVALIDDATA;
133 track = AV_RL32(buf + 8);
135 return AVERROR_INVALIDDATA;
136 if (track + 1 > fourxm->track_count) {
137 if (av_reallocp_array(&fourxm->tracks, track + 1, sizeof(AudioTrack)))
138 return AVERROR(ENOMEM);
139 memset(&fourxm->tracks[fourxm->track_count], 0,
140 sizeof(AudioTrack) * (track + 1 - fourxm->track_count));
141 fourxm->track_count = track + 1;
143 fourxm->tracks[track].adpcm = AV_RL32(buf + 12);
144 fourxm->tracks[track].channels = AV_RL32(buf + 36);
145 fourxm->tracks[track].sample_rate = AV_RL32(buf + 40);
146 fourxm->tracks[track].bits = AV_RL32(buf + 44);
147 fourxm->tracks[track].audio_pts = 0;
149 if (fourxm->tracks[track].channels <= 0 ||
150 fourxm->tracks[track].sample_rate <= 0 ||
151 fourxm->tracks[track].bits <= 0) {
152 av_log(s, AV_LOG_ERROR, "audio header invalid\n");
153 return AVERROR_INVALIDDATA;
155 /* allocate a new AVStream */
156 st = avformat_new_stream(s, NULL);
158 return AVERROR(ENOMEM);
161 avpriv_set_pts_info(st, 60, 1, fourxm->tracks[track].sample_rate);
163 fourxm->tracks[track].stream_index = st->index;
165 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
166 st->codec->codec_tag = 0;
167 st->codec->channels = fourxm->tracks[track].channels;
168 st->codec->sample_rate = fourxm->tracks[track].sample_rate;
169 st->codec->bits_per_coded_sample = fourxm->tracks[track].bits;
170 st->codec->bit_rate = st->codec->channels *
171 st->codec->sample_rate *
172 st->codec->bits_per_coded_sample;
173 st->codec->block_align = st->codec->channels *
174 st->codec->bits_per_coded_sample;
176 if (fourxm->tracks[track].adpcm){
177 st->codec->codec_id = AV_CODEC_ID_ADPCM_4XM;
178 } else if (st->codec->bits_per_coded_sample == 8) {
179 st->codec->codec_id = AV_CODEC_ID_PCM_U8;
181 st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
186 static int fourxm_read_header(AVFormatContext *s)
188 AVIOContext *pb = s->pb;
189 unsigned int fourcc_tag;
192 FourxmDemuxContext *fourxm = s->priv_data;
193 unsigned char *header;
196 fourxm->track_count = 0;
197 fourxm->tracks = NULL;
200 /* skip the first 3 32-bit numbers */
203 /* check for LIST-HEAD */
205 header_size = size - 4;
206 if (fourcc_tag != HEAD_TAG || header_size < 0)
207 return AVERROR_INVALIDDATA;
209 /* allocate space for the header and load the whole thing */
210 header = av_malloc(header_size);
212 return AVERROR(ENOMEM);
213 if (avio_read(pb, header, header_size) != header_size) {
218 /* take the lazy approach and search for any and all vtrk and strk chunks */
219 for (i = 0; i < header_size - 8; i++) {
220 fourcc_tag = AV_RL32(&header[i]);
221 size = AV_RL32(&header[i + 4]);
223 if (fourcc_tag == std__TAG) {
224 if (header_size - i < 16) {
225 ret = AVERROR_INVALIDDATA;
228 fourxm->fps = av_int2float(AV_RL32(&header[i + 12]));
229 } else if (fourcc_tag == vtrk_TAG) {
230 if ((ret = parse_vtrk(s, fourxm, header + i, size,
231 header_size - i)) < 0)
235 } else if (fourcc_tag == strk_TAG) {
236 if ((ret = parse_strk(s, fourxm, header + i, size,
237 header_size - i)) < 0)
244 /* skip over the LIST-MOVI chunk (which is where the stream should be */
246 if (fourcc_tag != MOVI_TAG) {
247 ret = AVERROR_INVALIDDATA;
252 /* initialize context members */
253 fourxm->video_pts = -1; /* first frame will push to 0 */
257 av_freep(&fourxm->tracks);
262 static int fourxm_read_packet(AVFormatContext *s,
265 FourxmDemuxContext *fourxm = s->priv_data;
266 AVIOContext *pb = s->pb;
267 unsigned int fourcc_tag;
270 unsigned int track_number;
272 unsigned char header[8];
273 int audio_frame_count;
275 while (!packet_read) {
276 if ((ret = avio_read(s->pb, header, 8)) < 0)
278 fourcc_tag = AV_RL32(&header[0]);
279 size = AV_RL32(&header[4]);
282 switch (fourcc_tag) {
284 /* this is a good time to bump the video pts */
287 /* skip the LIST-* tag and move on to the next fourcc */
297 /* allocate 8 more bytes than 'size' to account for fourcc
299 if (size + 8 < size || av_new_packet(pkt, size + 8))
301 pkt->stream_index = fourxm->video_stream_index;
302 pkt->pts = fourxm->video_pts;
303 pkt->pos = avio_tell(s->pb);
304 memcpy(pkt->data, header, 8);
305 ret = avio_read(s->pb, &pkt->data[8], size);
314 track_number = avio_rl32(pb);
318 if (track_number < fourxm->track_count &&
319 fourxm->tracks[track_number].channels > 0) {
320 ret = av_get_packet(s->pb, pkt, size);
324 fourxm->tracks[track_number].stream_index;
325 pkt->pts = fourxm->tracks[track_number].audio_pts;
329 audio_frame_count = size;
330 if (fourxm->tracks[track_number].adpcm)
331 audio_frame_count -= 2 * (fourxm->tracks[track_number].channels);
332 audio_frame_count /= fourxm->tracks[track_number].channels;
333 if (fourxm->tracks[track_number].adpcm) {
334 audio_frame_count *= 2;
337 (fourxm->tracks[track_number].bits / 8);
338 fourxm->tracks[track_number].audio_pts += audio_frame_count;
352 static int fourxm_read_close(AVFormatContext *s)
354 FourxmDemuxContext *fourxm = s->priv_data;
356 av_freep(&fourxm->tracks);
361 AVInputFormat ff_fourxm_demuxer = {
363 .long_name = NULL_IF_CONFIG_SMALL("4X Technologies"),
364 .priv_data_size = sizeof(FourxmDemuxContext),
365 .read_probe = fourxm_probe,
366 .read_header = fourxm_read_header,
367 .read_packet = fourxm_read_packet,
368 .read_close = fourxm_read_close,