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 {
71 typedef struct FourxmDemuxContext {
74 int video_stream_index;
84 static int fourxm_probe(AVProbeData *p)
86 if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
87 (AV_RL32(&p->buf[8]) != FOURXMV_TAG))
90 return AVPROBE_SCORE_MAX;
93 static int fourxm_read_header(AVFormatContext *s,
94 AVFormatParameters *ap)
96 ByteIOContext *pb = s->pb;
97 unsigned int fourcc_tag;
100 FourxmDemuxContext *fourxm = s->priv_data;
101 unsigned char *header;
103 int current_track = -1;
106 fourxm->track_count = 0;
107 fourxm->tracks = NULL;
108 fourxm->selected_track = 0;
111 /* skip the first 3 32-bit numbers */
112 url_fseek(pb, 12, SEEK_CUR);
114 /* check for LIST-HEAD */
116 header_size = size - 4;
117 if (fourcc_tag != HEAD_TAG)
118 return AVERROR_INVALIDDATA;
120 /* allocate space for the header and load the whole thing */
121 header = av_malloc(header_size);
123 return AVERROR(ENOMEM);
124 if (get_buffer(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]);
132 if (fourcc_tag == std__TAG) {
133 fourxm->fps = av_int2flt(AV_RL32(&header[i + 12]));
134 } else if (fourcc_tag == vtrk_TAG) {
135 /* check that there is enough data */
136 if (size != vtrk_SIZE) {
138 return AVERROR_INVALIDDATA;
140 fourxm->width = AV_RL32(&header[i + 36]);
141 fourxm->height = AV_RL32(&header[i + 40]);
143 /* allocate a new AVStream */
144 st = av_new_stream(s, 0);
146 return AVERROR(ENOMEM);
147 av_set_pts_info(st, 60, 1, fourxm->fps);
149 fourxm->video_stream_index = st->index;
151 st->codec->codec_type = CODEC_TYPE_VIDEO;
152 st->codec->codec_id = CODEC_ID_4XM;
153 st->codec->extradata_size = 4;
154 st->codec->extradata = av_malloc(4);
155 AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16]));
156 st->codec->width = fourxm->width;
157 st->codec->height = fourxm->height;
160 } else if (fourcc_tag == strk_TAG) {
161 /* check that there is enough data */
162 if (size != strk_SIZE) {
164 return AVERROR_INVALIDDATA;
166 current_track = AV_RL32(&header[i + 8]);
167 if (current_track + 1 > fourxm->track_count) {
168 fourxm->track_count = current_track + 1;
169 if((unsigned)fourxm->track_count >= UINT_MAX / sizeof(AudioTrack))
171 fourxm->tracks = av_realloc(fourxm->tracks,
172 fourxm->track_count * sizeof(AudioTrack));
173 if (!fourxm->tracks) {
175 return AVERROR(ENOMEM);
178 fourxm->tracks[current_track].adpcm = AV_RL32(&header[i + 12]);
179 fourxm->tracks[current_track].channels = AV_RL32(&header[i + 36]);
180 fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]);
181 fourxm->tracks[current_track].bits = AV_RL32(&header[i + 44]);
184 /* allocate a new AVStream */
185 st = av_new_stream(s, current_track);
187 return AVERROR(ENOMEM);
189 av_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate);
191 fourxm->tracks[current_track].stream_index = st->index;
193 st->codec->codec_type = CODEC_TYPE_AUDIO;
194 st->codec->codec_tag = 0;
195 st->codec->channels = fourxm->tracks[current_track].channels;
196 st->codec->sample_rate = fourxm->tracks[current_track].sample_rate;
197 st->codec->bits_per_coded_sample = fourxm->tracks[current_track].bits;
198 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
199 st->codec->bits_per_coded_sample;
200 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
201 if (fourxm->tracks[current_track].adpcm)
202 st->codec->codec_id = CODEC_ID_ADPCM_4XM;
203 else if (st->codec->bits_per_coded_sample == 8)
204 st->codec->codec_id = CODEC_ID_PCM_U8;
206 st->codec->codec_id = CODEC_ID_PCM_S16LE;
212 /* skip over the LIST-MOVI chunk (which is where the stream should be */
214 if (fourcc_tag != MOVI_TAG)
215 return AVERROR_INVALIDDATA;
217 /* initialize context members */
218 fourxm->video_pts = -1; /* first frame will push to 0 */
219 fourxm->audio_pts = 0;
224 static int fourxm_read_packet(AVFormatContext *s,
227 FourxmDemuxContext *fourxm = s->priv_data;
228 ByteIOContext *pb = s->pb;
229 unsigned int fourcc_tag;
230 unsigned int size, out_size;
234 unsigned char header[8];
235 int audio_frame_count;
237 while (!packet_read) {
239 if ((ret = get_buffer(s->pb, header, 8)) < 0)
241 fourcc_tag = AV_RL32(&header[0]);
242 size = AV_RL32(&header[4]);
245 switch (fourcc_tag) {
248 /* this is a good time to bump the video pts */
249 fourxm->video_pts ++;
251 /* skip the LIST-* tag and move on to the next fourcc */
263 /* allocate 8 more bytes than 'size' to account for fourcc
265 if (size + 8 < size || av_new_packet(pkt, size + 8))
267 pkt->stream_index = fourxm->video_stream_index;
268 pkt->pts = fourxm->video_pts;
269 pkt->pos = url_ftell(s->pb);
270 memcpy(pkt->data, header, 8);
271 ret = get_buffer(s->pb, &pkt->data[8], size);
281 track_number = get_le32(pb);
282 out_size= get_le32(pb);
285 if (track_number == fourxm->selected_track) {
286 ret= av_get_packet(s->pb, pkt, size);
290 fourxm->tracks[fourxm->selected_track].stream_index;
291 pkt->pts = fourxm->audio_pts;
295 audio_frame_count = size;
296 if (fourxm->tracks[fourxm->selected_track].adpcm)
298 2 * (fourxm->tracks[fourxm->selected_track].channels);
300 fourxm->tracks[fourxm->selected_track].channels;
301 if (fourxm->tracks[fourxm->selected_track].adpcm)
302 audio_frame_count *= 2;
305 (fourxm->tracks[fourxm->selected_track].bits / 8);
306 fourxm->audio_pts += audio_frame_count;
309 url_fseek(pb, size, SEEK_CUR);
314 url_fseek(pb, size, SEEK_CUR);
321 static int fourxm_read_close(AVFormatContext *s)
323 FourxmDemuxContext *fourxm = s->priv_data;
325 av_free(fourxm->tracks);
330 AVInputFormat fourxm_demuxer = {
332 NULL_IF_CONFIG_SMALL("4X Technologies format"),
333 sizeof(FourxmDemuxContext),