2 * 4X Technologies .4xm File Demuxer (no muxer)
3 * Copyright (c) 2003 The ffmpeg Project
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 * 4X Technologies file demuxer
23 * by Mike Melanson (melanson@pcisys.net)
24 * for more information on the .4xm file format, visit:
25 * http://www.pcisys.net/~melanson/codecs/
30 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
31 #define _4XMV_TAG MKTAG('4', 'X', 'M', 'V')
32 #define LIST_TAG MKTAG('L', 'I', 'S', 'T')
33 #define HEAD_TAG MKTAG('H', 'E', 'A', 'D')
34 #define TRK__TAG MKTAG('T', 'R', 'K', '_')
35 #define MOVI_TAG MKTAG('M', 'O', 'V', 'I')
36 #define VTRK_TAG MKTAG('V', 'T', 'R', 'K')
37 #define STRK_TAG MKTAG('S', 'T', 'R', 'K')
38 #define std__TAG MKTAG('s', 't', 'd', '_')
39 #define name_TAG MKTAG('n', 'a', 'm', 'e')
40 #define vtrk_TAG MKTAG('v', 't', 'r', 'k')
41 #define strk_TAG MKTAG('s', 't', 'r', 'k')
42 #define ifrm_TAG MKTAG('i', 'f', 'r', 'm')
43 #define pfrm_TAG MKTAG('p', 'f', 'r', 'm')
44 #define cfrm_TAG MKTAG('c', 'f', 'r', 'm')
45 #define snd__TAG MKTAG('s', 'n', 'd', '_')
47 #define vtrk_SIZE 0x44
48 #define strk_SIZE 0x28
50 #define GET_LIST_HEADER() \
51 fourcc_tag = get_le32(pb); \
52 size = get_le32(pb); \
53 if (fourcc_tag != LIST_TAG) \
54 return AVERROR_INVALIDDATA; \
55 fourcc_tag = get_le32(pb);
57 typedef struct AudioTrack {
65 typedef struct FourxmDemuxContext {
68 int video_stream_index;
78 static int fourxm_probe(AVProbeData *p)
83 if ((LE_32(&p->buf[0]) != RIFF_TAG) ||
84 (LE_32(&p->buf[8]) != _4XMV_TAG))
87 return AVPROBE_SCORE_MAX;
90 static int fourxm_read_header(AVFormatContext *s,
91 AVFormatParameters *ap)
93 ByteIOContext *pb = &s->pb;
94 unsigned int fourcc_tag;
97 FourxmDemuxContext *fourxm = (FourxmDemuxContext *)s->priv_data;
98 unsigned char *header;
100 int current_track = -1;
103 fourxm->track_count = 0;
104 fourxm->tracks = NULL;
105 fourxm->selected_track = 0;
108 /* skip the first 3 32-bit numbers */
109 url_fseek(pb, 12, SEEK_CUR);
111 /* check for LIST-HEAD */
113 header_size = size - 4;
114 if (fourcc_tag != HEAD_TAG)
115 return AVERROR_INVALIDDATA;
117 /* allocate space for the header and load the whole thing */
118 header = av_malloc(header_size);
120 return AVERROR_NOMEM;
121 if (get_buffer(pb, header, header_size) != header_size)
124 /* take the lazy approach and search for any and all vtrk and strk chunks */
125 for (i = 0; i < header_size - 8; i++) {
126 fourcc_tag = LE_32(&header[i]);
127 size = LE_32(&header[i + 4]);
129 if (fourcc_tag == std__TAG) {
130 fourxm->fps = av_int2flt(LE_32(&header[i + 12]));
131 } else if (fourcc_tag == vtrk_TAG) {
132 /* check that there is enough data */
133 if (size != vtrk_SIZE) {
135 return AVERROR_INVALIDDATA;
137 fourxm->width = LE_32(&header[i + 36]);
138 fourxm->height = LE_32(&header[i + 40]);
141 /* allocate a new AVStream */
142 st = av_new_stream(s, 0);
144 return AVERROR_NOMEM;
145 av_set_pts_info(st, 60, 1, fourxm->fps);
147 fourxm->video_stream_index = st->index;
149 st->codec->codec_type = CODEC_TYPE_VIDEO;
150 st->codec->codec_id = CODEC_ID_4XM;
151 st->codec->codec_tag = 0; /* no fourcc */
152 st->codec->width = fourxm->width;
153 st->codec->height = fourxm->height;
155 } else if (fourcc_tag == strk_TAG) {
156 /* check that there is enough data */
157 if (size != strk_SIZE) {
159 return AVERROR_INVALIDDATA;
161 current_track = LE_32(&header[i + 8]);
162 if (current_track + 1 > fourxm->track_count) {
163 fourxm->track_count = current_track + 1;
164 if((unsigned)fourxm->track_count >= UINT_MAX / sizeof(AudioTrack))
166 fourxm->tracks = av_realloc(fourxm->tracks,
167 fourxm->track_count * sizeof(AudioTrack));
168 if (!fourxm->tracks) {
170 return AVERROR_NOMEM;
173 fourxm->tracks[current_track].adpcm = LE_32(&header[i + 12]);
174 fourxm->tracks[current_track].channels = LE_32(&header[i + 36]);
175 fourxm->tracks[current_track].sample_rate = LE_32(&header[i + 40]);
176 fourxm->tracks[current_track].bits = LE_32(&header[i + 44]);
179 /* allocate a new AVStream */
180 st = av_new_stream(s, current_track);
182 return AVERROR_NOMEM;
184 av_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate);
186 fourxm->tracks[current_track].stream_index = st->index;
188 st->codec->codec_type = CODEC_TYPE_AUDIO;
189 st->codec->codec_tag = 1;
190 st->codec->channels = fourxm->tracks[current_track].channels;
191 st->codec->sample_rate = fourxm->tracks[current_track].sample_rate;
192 st->codec->bits_per_sample = fourxm->tracks[current_track].bits;
193 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
194 st->codec->bits_per_sample;
195 st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
196 if (fourxm->tracks[current_track].adpcm)
197 st->codec->codec_id = CODEC_ID_ADPCM_4XM;
198 else if (st->codec->bits_per_sample == 8)
199 st->codec->codec_id = CODEC_ID_PCM_U8;
201 st->codec->codec_id = CODEC_ID_PCM_S16LE;
207 /* skip over the LIST-MOVI chunk (which is where the stream should be */
209 if (fourcc_tag != MOVI_TAG)
210 return AVERROR_INVALIDDATA;
212 /* initialize context members */
213 fourxm->video_pts = -1; /* first frame will push to 0 */
214 fourxm->audio_pts = 0;
219 static int fourxm_read_packet(AVFormatContext *s,
222 FourxmDemuxContext *fourxm = s->priv_data;
223 ByteIOContext *pb = &s->pb;
224 unsigned int fourcc_tag;
225 unsigned int size, out_size;
229 unsigned char header[8];
230 int audio_frame_count;
232 while (!packet_read) {
234 if ((ret = get_buffer(&s->pb, header, 8)) < 0)
236 fourcc_tag = LE_32(&header[0]);
237 size = LE_32(&header[4]);
240 switch (fourcc_tag) {
243 /* this is a good time to bump the video pts */
244 fourxm->video_pts ++;
246 /* skip the LIST-* tag and move on to the next fourcc */
254 /* allocate 8 more bytes than 'size' to account for fourcc
256 if (size + 8 < size || av_new_packet(pkt, size + 8))
258 pkt->stream_index = fourxm->video_stream_index;
259 pkt->pts = fourxm->video_pts;
260 pkt->pos = url_ftell(&s->pb);
261 memcpy(pkt->data, header, 8);
262 ret = get_buffer(&s->pb, &pkt->data[8], size);
272 track_number = get_le32(pb);
273 out_size= get_le32(pb);
276 if (track_number == fourxm->selected_track) {
277 ret= av_get_packet(&s->pb, pkt, size);
281 fourxm->tracks[fourxm->selected_track].stream_index;
282 pkt->pts = fourxm->audio_pts;
286 audio_frame_count = size;
287 if (fourxm->tracks[fourxm->selected_track].adpcm)
289 2 * (fourxm->tracks[fourxm->selected_track].channels);
291 fourxm->tracks[fourxm->selected_track].channels;
292 if (fourxm->tracks[fourxm->selected_track].adpcm)
293 audio_frame_count *= 2;
296 (fourxm->tracks[fourxm->selected_track].bits / 8);
297 fourxm->audio_pts += audio_frame_count;
300 url_fseek(pb, size, SEEK_CUR);
305 url_fseek(pb, size, SEEK_CUR);
312 static int fourxm_read_close(AVFormatContext *s)
314 FourxmDemuxContext *fourxm = (FourxmDemuxContext *)s->priv_data;
316 av_free(fourxm->tracks);
321 static AVInputFormat fourxm_iformat = {
323 "4X Technologies format",
324 sizeof(FourxmDemuxContext),
331 int fourxm_init(void)
333 av_register_input_format(&fourxm_iformat);