2 * 4X Technologies .4xm File Demuxer (no muxer)
3 * Copyright (c) 2003 The ffmpeg Project
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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/
32 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
33 #define _4XMV_TAG MKTAG('4', 'X', 'M', 'V')
34 #define LIST_TAG MKTAG('L', 'I', 'S', 'T')
35 #define HEAD_TAG MKTAG('H', 'E', 'A', 'D')
36 #define TRK__TAG MKTAG('T', 'R', 'K', '_')
37 #define MOVI_TAG MKTAG('M', 'O', 'V', 'I')
38 #define VTRK_TAG MKTAG('V', 'T', 'R', 'K')
39 #define STRK_TAG MKTAG('S', 'T', 'R', 'K')
40 #define std__TAG MKTAG('s', 't', 'd', '_')
41 #define name_TAG MKTAG('n', 'a', 'm', 'e')
42 #define vtrk_TAG MKTAG('v', 't', 'r', 'k')
43 #define strk_TAG MKTAG('s', 't', 'r', 'k')
44 #define ifrm_TAG MKTAG('i', 'f', 'r', 'm')
45 #define pfrm_TAG MKTAG('p', 'f', 'r', 'm')
46 #define cfrm_TAG MKTAG('c', 'f', 'r', 'm')
47 #define snd__TAG MKTAG('s', 'n', 'd', '_')
49 #define vtrk_SIZE 0x44
50 #define strk_SIZE 0x28
52 #define GET_LIST_HEADER() \
53 fourcc_tag = get_le32(pb); \
54 size = get_le32(pb); \
55 if (fourcc_tag != LIST_TAG) \
56 return AVERROR_INVALIDDATA; \
57 fourcc_tag = get_le32(pb);
59 typedef struct AudioTrack {
67 typedef struct FourxmDemuxContext {
70 int video_stream_index;
80 static int fourxm_probe(AVProbeData *p)
82 if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
83 (AV_RL32(&p->buf[8]) != _4XMV_TAG))
86 return AVPROBE_SCORE_MAX;
89 static int fourxm_read_header(AVFormatContext *s,
90 AVFormatParameters *ap)
92 ByteIOContext *pb = &s->pb;
93 unsigned int fourcc_tag;
96 FourxmDemuxContext *fourxm = s->priv_data;
97 unsigned char *header;
99 int current_track = -1;
102 fourxm->track_count = 0;
103 fourxm->tracks = NULL;
104 fourxm->selected_track = 0;
107 /* skip the first 3 32-bit numbers */
108 url_fseek(pb, 12, SEEK_CUR);
110 /* check for LIST-HEAD */
112 header_size = size - 4;
113 if (fourcc_tag != HEAD_TAG)
114 return AVERROR_INVALIDDATA;
116 /* allocate space for the header and load the whole thing */
117 header = av_malloc(header_size);
119 return AVERROR_NOMEM;
120 if (get_buffer(pb, header, header_size) != header_size)
123 /* take the lazy approach and search for any and all vtrk and strk chunks */
124 for (i = 0; i < header_size - 8; i++) {
125 fourcc_tag = AV_RL32(&header[i]);
126 size = AV_RL32(&header[i + 4]);
128 if (fourcc_tag == std__TAG) {
129 fourxm->fps = av_int2flt(AV_RL32(&header[i + 12]));
130 } else if (fourcc_tag == vtrk_TAG) {
131 /* check that there is enough data */
132 if (size != vtrk_SIZE) {
134 return AVERROR_INVALIDDATA;
136 fourxm->width = AV_RL32(&header[i + 36]);
137 fourxm->height = AV_RL32(&header[i + 40]);
140 /* allocate a new AVStream */
141 st = av_new_stream(s, 0);
143 return AVERROR_NOMEM;
144 av_set_pts_info(st, 60, 1, fourxm->fps);
146 fourxm->video_stream_index = st->index;
148 st->codec->codec_type = CODEC_TYPE_VIDEO;
149 st->codec->codec_id = CODEC_ID_4XM;
150 st->codec->codec_tag = 0; /* no fourcc */
151 st->codec->width = fourxm->width;
152 st->codec->height = fourxm->height;
154 } else if (fourcc_tag == strk_TAG) {
155 /* check that there is enough data */
156 if (size != strk_SIZE) {
158 return AVERROR_INVALIDDATA;
160 current_track = AV_RL32(&header[i + 8]);
161 if (current_track + 1 > fourxm->track_count) {
162 fourxm->track_count = current_track + 1;
163 if((unsigned)fourxm->track_count >= UINT_MAX / sizeof(AudioTrack))
165 fourxm->tracks = av_realloc(fourxm->tracks,
166 fourxm->track_count * sizeof(AudioTrack));
167 if (!fourxm->tracks) {
169 return AVERROR_NOMEM;
172 fourxm->tracks[current_track].adpcm = AV_RL32(&header[i + 12]);
173 fourxm->tracks[current_track].channels = AV_RL32(&header[i + 36]);
174 fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]);
175 fourxm->tracks[current_track].bits = AV_RL32(&header[i + 44]);
178 /* allocate a new AVStream */
179 st = av_new_stream(s, current_track);
181 return AVERROR_NOMEM;
183 av_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate);
185 fourxm->tracks[current_track].stream_index = st->index;
187 st->codec->codec_type = CODEC_TYPE_AUDIO;
188 st->codec->codec_tag = 0;
189 st->codec->channels = fourxm->tracks[current_track].channels;
190 st->codec->sample_rate = fourxm->tracks[current_track].sample_rate;
191 st->codec->bits_per_sample = fourxm->tracks[current_track].bits;
192 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
193 st->codec->bits_per_sample;
194 st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
195 if (fourxm->tracks[current_track].adpcm)
196 st->codec->codec_id = CODEC_ID_ADPCM_4XM;
197 else if (st->codec->bits_per_sample == 8)
198 st->codec->codec_id = CODEC_ID_PCM_U8;
200 st->codec->codec_id = CODEC_ID_PCM_S16LE;
206 /* skip over the LIST-MOVI chunk (which is where the stream should be */
208 if (fourcc_tag != MOVI_TAG)
209 return AVERROR_INVALIDDATA;
211 /* initialize context members */
212 fourxm->video_pts = -1; /* first frame will push to 0 */
213 fourxm->audio_pts = 0;
218 static int fourxm_read_packet(AVFormatContext *s,
221 FourxmDemuxContext *fourxm = s->priv_data;
222 ByteIOContext *pb = &s->pb;
223 unsigned int fourcc_tag;
224 unsigned int size, out_size;
228 unsigned char header[8];
229 int audio_frame_count;
231 while (!packet_read) {
233 if ((ret = get_buffer(&s->pb, header, 8)) < 0)
235 fourcc_tag = AV_RL32(&header[0]);
236 size = AV_RL32(&header[4]);
239 switch (fourcc_tag) {
242 /* this is a good time to bump the video pts */
243 fourxm->video_pts ++;
245 /* skip the LIST-* tag and move on to the next fourcc */
253 /* allocate 8 more bytes than 'size' to account for fourcc
255 if (size + 8 < size || av_new_packet(pkt, size + 8))
257 pkt->stream_index = fourxm->video_stream_index;
258 pkt->pts = fourxm->video_pts;
259 pkt->pos = url_ftell(&s->pb);
260 memcpy(pkt->data, header, 8);
261 ret = get_buffer(&s->pb, &pkt->data[8], size);
271 track_number = get_le32(pb);
272 out_size= get_le32(pb);
275 if (track_number == fourxm->selected_track) {
276 ret= av_get_packet(&s->pb, pkt, size);
280 fourxm->tracks[fourxm->selected_track].stream_index;
281 pkt->pts = fourxm->audio_pts;
285 audio_frame_count = size;
286 if (fourxm->tracks[fourxm->selected_track].adpcm)
288 2 * (fourxm->tracks[fourxm->selected_track].channels);
290 fourxm->tracks[fourxm->selected_track].channels;
291 if (fourxm->tracks[fourxm->selected_track].adpcm)
292 audio_frame_count *= 2;
295 (fourxm->tracks[fourxm->selected_track].bits / 8);
296 fourxm->audio_pts += audio_frame_count;
299 url_fseek(pb, size, SEEK_CUR);
304 url_fseek(pb, size, SEEK_CUR);
311 static int fourxm_read_close(AVFormatContext *s)
313 FourxmDemuxContext *fourxm = s->priv_data;
315 av_free(fourxm->tracks);
320 AVInputFormat fourxm_demuxer = {
322 "4X Technologies format",
323 sizeof(FourxmDemuxContext),