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"
33 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
34 #define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V')
35 #define LIST_TAG MKTAG('L', 'I', 'S', 'T')
36 #define HEAD_TAG MKTAG('H', 'E', 'A', 'D')
37 #define TRK__TAG MKTAG('T', 'R', 'K', '_')
38 #define MOVI_TAG MKTAG('M', 'O', 'V', 'I')
39 #define VTRK_TAG MKTAG('V', 'T', 'R', 'K')
40 #define STRK_TAG MKTAG('S', 'T', 'R', 'K')
41 #define std__TAG MKTAG('s', 't', 'd', '_')
42 #define name_TAG MKTAG('n', 'a', 'm', 'e')
43 #define vtrk_TAG MKTAG('v', 't', 'r', 'k')
44 #define strk_TAG MKTAG('s', 't', 'r', 'k')
45 #define ifrm_TAG MKTAG('i', 'f', 'r', 'm')
46 #define pfrm_TAG MKTAG('p', 'f', 'r', 'm')
47 #define cfrm_TAG MKTAG('c', 'f', 'r', 'm')
48 #define ifr2_TAG MKTAG('i', 'f', 'r', '2')
49 #define pfr2_TAG MKTAG('p', 'f', 'r', '2')
50 #define cfr2_TAG MKTAG('c', 'f', 'r', '2')
51 #define snd__TAG MKTAG('s', 'n', 'd', '_')
53 #define vtrk_SIZE 0x44
54 #define strk_SIZE 0x28
56 #define GET_LIST_HEADER() \
57 fourcc_tag = get_le32(pb); \
58 size = get_le32(pb); \
59 if (fourcc_tag != LIST_TAG) \
60 return AVERROR_INVALIDDATA; \
61 fourcc_tag = get_le32(pb);
63 typedef struct AudioTrack {
72 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 fourxm_read_header(AVFormatContext *s,
93 AVFormatParameters *ap)
95 ByteIOContext *pb = s->pb;
96 unsigned int fourcc_tag;
99 FourxmDemuxContext *fourxm = s->priv_data;
100 unsigned char *header;
104 fourxm->track_count = 0;
105 fourxm->tracks = NULL;
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 || header_size < 0)
115 return AVERROR_INVALIDDATA;
117 /* allocate space for the header and load the whole thing */
118 header = av_malloc(header_size);
120 return AVERROR(ENOMEM);
121 if (get_buffer(pb, header, header_size) != header_size){
126 /* take the lazy approach and search for any and all vtrk and strk chunks */
127 for (i = 0; i < header_size - 8; i++) {
128 fourcc_tag = AV_RL32(&header[i]);
129 size = AV_RL32(&header[i + 4]);
131 if (fourcc_tag == std__TAG) {
132 fourxm->fps = av_int2flt(AV_RL32(&header[i + 12]));
133 } else if (fourcc_tag == vtrk_TAG) {
134 /* check that there is enough data */
135 if (size != vtrk_SIZE) {
136 ret= AVERROR_INVALIDDATA;
139 fourxm->width = AV_RL32(&header[i + 36]);
140 fourxm->height = AV_RL32(&header[i + 40]);
142 /* allocate a new AVStream */
143 st = av_new_stream(s, 0);
145 ret= AVERROR(ENOMEM);
148 av_set_pts_info(st, 60, 1, fourxm->fps);
150 fourxm->video_stream_index = st->index;
152 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
153 st->codec->codec_id = CODEC_ID_4XM;
154 st->codec->extradata_size = 4;
155 st->codec->extradata = av_malloc(4);
156 AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16]));
157 st->codec->width = fourxm->width;
158 st->codec->height = fourxm->height;
161 } else if (fourcc_tag == strk_TAG) {
163 /* check that there is enough data */
164 if (size != strk_SIZE) {
165 ret= AVERROR_INVALIDDATA;
168 current_track = AV_RL32(&header[i + 8]);
169 if((unsigned)current_track >= UINT_MAX / sizeof(AudioTrack) - 1){
170 av_log(s, AV_LOG_ERROR, "current_track too large\n");
174 if (current_track + 1 > fourxm->track_count) {
175 fourxm->track_count = current_track + 1;
176 fourxm->tracks = av_realloc(fourxm->tracks,
177 fourxm->track_count * sizeof(AudioTrack));
178 if (!fourxm->tracks) {
179 ret= AVERROR(ENOMEM);
183 fourxm->tracks[current_track].adpcm = AV_RL32(&header[i + 12]);
184 fourxm->tracks[current_track].channels = AV_RL32(&header[i + 36]);
185 fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]);
186 fourxm->tracks[current_track].bits = AV_RL32(&header[i + 44]);
187 fourxm->tracks[current_track].audio_pts = 0;
190 /* allocate a new AVStream */
191 st = av_new_stream(s, current_track);
193 ret= AVERROR(ENOMEM);
197 av_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate);
199 fourxm->tracks[current_track].stream_index = st->index;
201 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
202 st->codec->codec_tag = 0;
203 st->codec->channels = fourxm->tracks[current_track].channels;
204 st->codec->sample_rate = fourxm->tracks[current_track].sample_rate;
205 st->codec->bits_per_coded_sample = fourxm->tracks[current_track].bits;
206 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
207 st->codec->bits_per_coded_sample;
208 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
209 if (fourxm->tracks[current_track].adpcm){
210 st->codec->codec_id = CODEC_ID_ADPCM_4XM;
211 }else if (st->codec->bits_per_coded_sample == 8){
212 st->codec->codec_id = CODEC_ID_PCM_U8;
214 st->codec->codec_id = CODEC_ID_PCM_S16LE;
218 /* skip over the LIST-MOVI chunk (which is where the stream should be */
220 if (fourcc_tag != MOVI_TAG){
221 ret= AVERROR_INVALIDDATA;
226 /* initialize context members */
227 fourxm->video_pts = -1; /* first frame will push to 0 */
231 av_freep(&fourxm->tracks);
236 static int fourxm_read_packet(AVFormatContext *s,
239 FourxmDemuxContext *fourxm = s->priv_data;
240 ByteIOContext *pb = s->pb;
241 unsigned int fourcc_tag;
242 unsigned int size, out_size;
244 unsigned int track_number;
246 unsigned char header[8];
247 int audio_frame_count;
249 while (!packet_read) {
251 if ((ret = get_buffer(s->pb, header, 8)) < 0)
253 fourcc_tag = AV_RL32(&header[0]);
254 size = AV_RL32(&header[4]);
257 switch (fourcc_tag) {
260 /* this is a good time to bump the video pts */
261 fourxm->video_pts ++;
263 /* skip the LIST-* tag and move on to the next fourcc */
273 /* allocate 8 more bytes than 'size' to account for fourcc
275 if (size + 8 < size || av_new_packet(pkt, size + 8))
277 pkt->stream_index = fourxm->video_stream_index;
278 pkt->pts = fourxm->video_pts;
279 pkt->pos = url_ftell(s->pb);
280 memcpy(pkt->data, header, 8);
281 ret = get_buffer(s->pb, &pkt->data[8], size);
290 track_number = get_le32(pb);
291 out_size= get_le32(pb);
294 if (track_number < fourxm->track_count) {
295 ret= av_get_packet(s->pb, pkt, size);
299 fourxm->tracks[track_number].stream_index;
300 pkt->pts = fourxm->tracks[track_number].audio_pts;
304 audio_frame_count = size;
305 if (fourxm->tracks[track_number].adpcm)
307 2 * (fourxm->tracks[track_number].channels);
309 fourxm->tracks[track_number].channels;
310 if (fourxm->tracks[track_number].adpcm){
311 audio_frame_count *= 2;
314 (fourxm->tracks[track_number].bits / 8);
315 fourxm->tracks[track_number].audio_pts += audio_frame_count;
318 url_fseek(pb, size, SEEK_CUR);
323 url_fseek(pb, size, SEEK_CUR);
330 static int fourxm_read_close(AVFormatContext *s)
332 FourxmDemuxContext *fourxm = s->priv_data;
334 av_freep(&fourxm->tracks);
339 AVInputFormat fourxm_demuxer = {
341 NULL_IF_CONFIG_SMALL("4X Technologies format"),
342 sizeof(FourxmDemuxContext),