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 {
77 int video_stream_index;
85 static int fourxm_probe(AVProbeData *p)
87 if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
88 (AV_RL32(&p->buf[8]) != FOURXMV_TAG))
91 return AVPROBE_SCORE_MAX;
94 static int fourxm_read_header(AVFormatContext *s)
96 AVIOContext *pb = s->pb;
97 unsigned int fourcc_tag;
100 FourxmDemuxContext *fourxm = s->priv_data;
101 unsigned char *header;
105 fourxm->track_count = 0;
106 fourxm->tracks = NULL;
109 /* skip the first 3 32-bit numbers */
112 /* check for LIST-HEAD */
114 header_size = size - 4;
115 if (fourcc_tag != HEAD_TAG || header_size < 0)
116 return AVERROR_INVALIDDATA;
118 /* allocate space for the header and load the whole thing */
119 header = av_malloc(header_size);
121 return AVERROR(ENOMEM);
122 if (avio_read(pb, header, header_size) != header_size){
127 /* take the lazy approach and search for any and all vtrk and strk chunks */
128 for (i = 0; i < header_size - 8; i++) {
129 fourcc_tag = AV_RL32(&header[i]);
130 size = AV_RL32(&header[i + 4]);
131 if (size > header_size - i - 8 && (fourcc_tag == vtrk_TAG || fourcc_tag == strk_TAG)) {
132 av_log(s, AV_LOG_ERROR, "chunk larger than array %d>%d\n", size, header_size - i - 8);
133 return AVERROR_INVALIDDATA;
136 if (fourcc_tag == std__TAG) {
137 fourxm->fps = av_int2float(AV_RL32(&header[i + 12]));
138 } else if (fourcc_tag == vtrk_TAG) {
139 /* check that there is enough data */
140 if (size != vtrk_SIZE) {
141 ret= AVERROR_INVALIDDATA;
144 fourxm->width = AV_RL32(&header[i + 36]);
145 fourxm->height = AV_RL32(&header[i + 40]);
147 /* allocate a new AVStream */
148 st = avformat_new_stream(s, NULL);
150 ret= AVERROR(ENOMEM);
153 avpriv_set_pts_info(st, 60, 1, fourxm->fps);
155 fourxm->video_stream_index = st->index;
157 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
158 st->codec->codec_id = CODEC_ID_4XM;
159 st->codec->extradata_size = 4;
160 st->codec->extradata = av_malloc(4);
161 AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16]));
162 st->codec->width = fourxm->width;
163 st->codec->height = fourxm->height;
166 } else if (fourcc_tag == strk_TAG) {
168 /* check that there is enough data */
169 if (size != strk_SIZE) {
170 ret= AVERROR_INVALIDDATA;
173 current_track = AV_RL32(&header[i + 8]);
174 if((unsigned)current_track >= UINT_MAX / sizeof(AudioTrack) - 1){
175 av_log(s, AV_LOG_ERROR, "current_track too large\n");
176 ret = AVERROR_INVALIDDATA;
179 if (current_track + 1 > fourxm->track_count) {
180 fourxm->tracks = av_realloc_f(fourxm->tracks,
183 if (!fourxm->tracks) {
184 ret = AVERROR(ENOMEM);
187 memset(&fourxm->tracks[fourxm->track_count], 0,
188 sizeof(AudioTrack) * (current_track + 1 - fourxm->track_count));
189 fourxm->track_count = current_track + 1;
191 fourxm->tracks[current_track].adpcm = AV_RL32(&header[i + 12]);
192 fourxm->tracks[current_track].channels = AV_RL32(&header[i + 36]);
193 fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]);
194 fourxm->tracks[current_track].bits = AV_RL32(&header[i + 44]);
195 fourxm->tracks[current_track].audio_pts = 0;
196 if( fourxm->tracks[current_track].channels <= 0
197 || fourxm->tracks[current_track].sample_rate <= 0
198 || fourxm->tracks[current_track].bits < 0){
199 av_log(s, AV_LOG_ERROR, "audio header invalid\n");
200 ret = AVERROR_INVALIDDATA;
203 if(!fourxm->tracks[current_track].adpcm && fourxm->tracks[current_track].bits<8){
204 av_log(s, AV_LOG_ERROR, "bits unspecified for non ADPCM\n");
205 ret = AVERROR_INVALIDDATA;
210 /* allocate a new AVStream */
211 st = avformat_new_stream(s, NULL);
213 ret= AVERROR(ENOMEM);
217 st->id = current_track;
218 avpriv_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate);
220 fourxm->tracks[current_track].stream_index = st->index;
222 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
223 st->codec->codec_tag = 0;
224 st->codec->channels = fourxm->tracks[current_track].channels;
225 st->codec->sample_rate = fourxm->tracks[current_track].sample_rate;
226 st->codec->bits_per_coded_sample = fourxm->tracks[current_track].bits;
227 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
228 st->codec->bits_per_coded_sample;
229 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
230 if (fourxm->tracks[current_track].adpcm){
231 st->codec->codec_id = CODEC_ID_ADPCM_4XM;
232 }else if (st->codec->bits_per_coded_sample == 8){
233 st->codec->codec_id = CODEC_ID_PCM_U8;
235 st->codec->codec_id = CODEC_ID_PCM_S16LE;
239 /* skip over the LIST-MOVI chunk (which is where the stream should be */
241 if (fourcc_tag != MOVI_TAG){
242 ret= AVERROR_INVALIDDATA;
247 /* initialize context members */
248 fourxm->video_pts = -1; /* first frame will push to 0 */
252 av_freep(&fourxm->tracks);
257 static int fourxm_read_packet(AVFormatContext *s,
260 FourxmDemuxContext *fourxm = s->priv_data;
261 AVIOContext *pb = s->pb;
262 unsigned int fourcc_tag;
265 unsigned int track_number;
267 unsigned char header[8];
268 int audio_frame_count;
270 while (!packet_read) {
272 if ((ret = avio_read(s->pb, header, 8)) < 0)
274 fourcc_tag = AV_RL32(&header[0]);
275 size = AV_RL32(&header[4]);
278 switch (fourcc_tag) {
281 /* this is a good time to bump the video pts */
282 fourxm->video_pts ++;
284 /* skip the LIST-* tag and move on to the next fourcc */
294 /* allocate 8 more bytes than 'size' to account for fourcc
296 if (size + 8 < size || av_new_packet(pkt, size + 8))
298 pkt->stream_index = fourxm->video_stream_index;
299 pkt->pts = fourxm->video_pts;
300 pkt->pos = avio_tell(s->pb);
301 memcpy(pkt->data, header, 8);
302 ret = avio_read(s->pb, &pkt->data[8], size);
311 track_number = avio_rl32(pb);
315 if (track_number < fourxm->track_count && fourxm->tracks[track_number].channels>0) {
316 ret= av_get_packet(s->pb, pkt, size);
320 fourxm->tracks[track_number].stream_index;
321 pkt->pts = fourxm->tracks[track_number].audio_pts;
325 audio_frame_count = size;
326 if (fourxm->tracks[track_number].adpcm)
328 2 * (fourxm->tracks[track_number].channels);
330 fourxm->tracks[track_number].channels;
331 if (fourxm->tracks[track_number].adpcm){
332 audio_frame_count *= 2;
335 (fourxm->tracks[track_number].bits / 8);
336 fourxm->tracks[track_number].audio_pts += audio_frame_count;
351 static int fourxm_read_close(AVFormatContext *s)
353 FourxmDemuxContext *fourxm = s->priv_data;
355 av_freep(&fourxm->tracks);
360 AVInputFormat ff_fourxm_demuxer = {
362 .long_name = NULL_IF_CONFIG_SMALL("4X Technologies format"),
363 .priv_data_size = sizeof(FourxmDemuxContext),
364 .read_probe = fourxm_probe,
365 .read_header = fourxm_read_header,
366 .read_packet = fourxm_read_packet,
367 .read_close = fourxm_read_close,