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/
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);
134 if ((unsigned)track >= UINT_MAX / sizeof(AudioTrack) - 1) {
135 av_log(s, AV_LOG_ERROR, "current_track too large\n");
136 return AVERROR_INVALIDDATA;
138 if (track + 1 > fourxm->track_count) {
139 if (av_reallocp_array(&fourxm->tracks, track + 1, sizeof(AudioTrack)))
140 return AVERROR(ENOMEM);
141 memset(&fourxm->tracks[fourxm->track_count], 0,
142 sizeof(AudioTrack) * (track + 1 - fourxm->track_count));
143 fourxm->track_count = track + 1;
145 fourxm->tracks[track].adpcm = AV_RL32(buf + 12);
146 fourxm->tracks[track].channels = AV_RL32(buf + 36);
147 fourxm->tracks[track].sample_rate = AV_RL32(buf + 40);
148 fourxm->tracks[track].bits = AV_RL32(buf + 44);
149 fourxm->tracks[track].audio_pts = 0;
151 if (fourxm->tracks[track].channels <= 0 ||
152 fourxm->tracks[track].sample_rate <= 0 ||
153 fourxm->tracks[track].bits < 0) {
154 av_log(s, AV_LOG_ERROR, "audio header invalid\n");
155 return AVERROR_INVALIDDATA;
157 if (!fourxm->tracks[track].adpcm && fourxm->tracks[track].bits<8) {
158 av_log(s, AV_LOG_ERROR, "bits unspecified for non ADPCM\n");
159 return AVERROR_INVALIDDATA;
162 /* allocate a new AVStream */
163 st = avformat_new_stream(s, NULL);
165 return AVERROR(ENOMEM);
168 avpriv_set_pts_info(st, 60, 1, fourxm->tracks[track].sample_rate);
170 fourxm->tracks[track].stream_index = st->index;
172 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
173 st->codec->codec_tag = 0;
174 st->codec->channels = fourxm->tracks[track].channels;
175 st->codec->sample_rate = fourxm->tracks[track].sample_rate;
176 st->codec->bits_per_coded_sample = fourxm->tracks[track].bits;
177 st->codec->bit_rate = st->codec->channels *
178 st->codec->sample_rate *
179 st->codec->bits_per_coded_sample;
180 st->codec->block_align = st->codec->channels *
181 st->codec->bits_per_coded_sample;
183 if (fourxm->tracks[track].adpcm){
184 st->codec->codec_id = AV_CODEC_ID_ADPCM_4XM;
185 } else if (st->codec->bits_per_coded_sample == 8) {
186 st->codec->codec_id = AV_CODEC_ID_PCM_U8;
188 st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
193 static int fourxm_read_header(AVFormatContext *s)
195 AVIOContext *pb = s->pb;
196 unsigned int fourcc_tag;
199 FourxmDemuxContext *fourxm = s->priv_data;
200 unsigned char *header;
203 fourxm->track_count = 0;
204 fourxm->tracks = NULL;
207 /* skip the first 3 32-bit numbers */
210 /* check for LIST-HEAD */
212 header_size = size - 4;
213 if (fourcc_tag != HEAD_TAG || header_size < 0)
214 return AVERROR_INVALIDDATA;
216 /* allocate space for the header and load the whole thing */
217 header = av_malloc(header_size);
219 return AVERROR(ENOMEM);
220 if (avio_read(pb, header, header_size) != header_size) {
225 /* take the lazy approach and search for any and all vtrk and strk chunks */
226 for (i = 0; i < header_size - 8; i++) {
227 fourcc_tag = AV_RL32(&header[i]);
228 size = AV_RL32(&header[i + 4]);
229 if (size > header_size - i - 8 && (fourcc_tag == vtrk_TAG || fourcc_tag == strk_TAG)) {
230 av_log(s, AV_LOG_ERROR, "chunk larger than array %d>%d\n", size, header_size - i - 8);
231 return AVERROR_INVALIDDATA;
234 if (fourcc_tag == std__TAG) {
235 if (header_size - i < 16) {
236 av_log(s, AV_LOG_ERROR, "std TAG truncated\n");
237 ret = AVERROR_INVALIDDATA;
240 fourxm->fps = av_int2float(AV_RL32(&header[i + 12]));
241 } else if (fourcc_tag == vtrk_TAG) {
242 if ((ret = parse_vtrk(s, fourxm, header + i, size,
243 header_size - i)) < 0)
247 } else if (fourcc_tag == strk_TAG) {
248 if ((ret = parse_strk(s, fourxm, header + i, size,
249 header_size - i)) < 0)
256 /* skip over the LIST-MOVI chunk (which is where the stream should be */
258 if (fourcc_tag != MOVI_TAG) {
259 ret = AVERROR_INVALIDDATA;
264 /* initialize context members */
265 fourxm->video_pts = -1; /* first frame will push to 0 */
269 av_freep(&fourxm->tracks);
274 static int fourxm_read_packet(AVFormatContext *s,
277 FourxmDemuxContext *fourxm = s->priv_data;
278 AVIOContext *pb = s->pb;
279 unsigned int fourcc_tag;
282 unsigned int track_number;
284 unsigned char header[8];
285 int audio_frame_count;
287 while (!packet_read) {
288 if ((ret = avio_read(s->pb, header, 8)) < 0)
290 fourcc_tag = AV_RL32(&header[0]);
291 size = AV_RL32(&header[4]);
294 switch (fourcc_tag) {
296 /* this is a good time to bump the video pts */
299 /* skip the LIST-* tag and move on to the next fourcc */
309 /* allocate 8 more bytes than 'size' to account for fourcc
311 if (size + 8 < size || av_new_packet(pkt, size + 8))
313 pkt->stream_index = fourxm->video_stream_index;
314 pkt->pts = fourxm->video_pts;
315 pkt->pos = avio_tell(s->pb);
316 memcpy(pkt->data, header, 8);
317 ret = avio_read(s->pb, &pkt->data[8], size);
326 track_number = avio_rl32(pb);
330 if (track_number < fourxm->track_count &&
331 fourxm->tracks[track_number].channels > 0) {
332 ret = av_get_packet(s->pb, pkt, size);
336 fourxm->tracks[track_number].stream_index;
337 pkt->pts = fourxm->tracks[track_number].audio_pts;
341 audio_frame_count = size;
342 if (fourxm->tracks[track_number].adpcm)
343 audio_frame_count -= 2 * (fourxm->tracks[track_number].channels);
344 audio_frame_count /= fourxm->tracks[track_number].channels;
345 if (fourxm->tracks[track_number].adpcm) {
346 audio_frame_count *= 2;
349 (fourxm->tracks[track_number].bits / 8);
350 fourxm->tracks[track_number].audio_pts += audio_frame_count;
364 static int fourxm_read_close(AVFormatContext *s)
366 FourxmDemuxContext *fourxm = s->priv_data;
368 av_freep(&fourxm->tracks);
373 AVInputFormat ff_fourxm_demuxer = {
375 .long_name = NULL_IF_CONFIG_SMALL("4X Technologies"),
376 .priv_data_size = sizeof(FourxmDemuxContext),
377 .read_probe = fourxm_probe,
378 .read_header = fourxm_read_header,
379 .read_packet = fourxm_read_packet,
380 .read_close = fourxm_read_close,