--- /dev/null
+/*
+ * 4X Technologies .4xm File Demuxer (no muxer)
+ * Copyright (c) 2003 The ffmpeg Project
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/**
+ * @file 4xm.c
+ * 4X Technologies file demuxer
+ * by Mike Melanson (melanson@pcisys.net)
+ * for more information on the .4xm file format, visit:
+ * http://www.pcisys.net/~melanson/codecs/
+ */
+
+#include "avformat.h"
+
+#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
+#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
+ (((uint8_t*)(x))[2] << 16) | \
+ (((uint8_t*)(x))[1] << 8) | \
+ ((uint8_t*)(x))[0])
+
+#define FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
+ ( (long)(unsigned char)(ch0) | \
+ ( (long)(unsigned char)(ch1) << 8 ) | \
+ ( (long)(unsigned char)(ch2) << 16 ) | \
+ ( (long)(unsigned char)(ch3) << 24 ) )
+
+#define RIFF_TAG FOURCC_TAG('R', 'I', 'F', 'F')
+#define _4XMV_TAG FOURCC_TAG('4', 'X', 'M', 'V')
+#define LIST_TAG FOURCC_TAG('L', 'I', 'S', 'T')
+#define HEAD_TAG FOURCC_TAG('H', 'E', 'A', 'D')
+#define TRK__TAG FOURCC_TAG('T', 'R', 'K', '_')
+#define MOVI_TAG FOURCC_TAG('M', 'O', 'V', 'I')
+#define VTRK_TAG FOURCC_TAG('V', 'T', 'R', 'K')
+#define STRK_TAG FOURCC_TAG('S', 'T', 'R', 'K')
+#define name_TAG FOURCC_TAG('n', 'a', 'm', 'e')
+#define vtrk_TAG FOURCC_TAG('v', 't', 'r', 'k')
+#define strk_TAG FOURCC_TAG('s', 't', 'r', 'k')
+#define ifrm_TAG FOURCC_TAG('i', 'f', 'r', 'm')
+#define pfrm_TAG FOURCC_TAG('p', 'f', 'r', 'm')
+#define cfrm_TAG FOURCC_TAG('c', 'f', 'r', 'm')
+#define snd__TAG FOURCC_TAG('s', 'n', 'd', '_')
+#define _TAG FOURCC_TAG('', '', '', '')
+
+#define vtrk_SIZE 0x44
+#define strk_SIZE 0x28
+
+#define GET_LIST_HEADER() \
+ fourcc_tag = get_le32(pb); \
+ size = get_le32(pb); \
+ if (fourcc_tag != LIST_TAG) \
+ return AVERROR_INVALIDDATA; \
+ fourcc_tag = get_le32(pb);
+
+typedef struct AudioTrack {
+ int sample_rate;
+ int bits;
+ int channels;
+ int stream_index;
+ int adpcm;
+} AudioTrack;
+
+typedef struct FourxmDemuxContext {
+ int width;
+ int height;
+ int video_stream_index;
+ int track_count;
+ AudioTrack *tracks;
+ int selected_track;
+
+ int64_t pts;
+ int last_chunk_was_audio;
+ int last_audio_frame_count;
+} FourxmDemuxContext;
+
+static int fourxm_probe(AVProbeData *p)
+{
+ if (p->buf_size < 12)
+ return 0;
+
+ if ((LE_32(&p->buf[0]) != RIFF_TAG) ||
+ (LE_32(&p->buf[8]) != _4XMV_TAG))
+ return 0;
+
+ return AVPROBE_SCORE_MAX;
+}
+
+static int fourxm_read_header(AVFormatContext *s,
+ AVFormatParameters *ap)
+{
+ ByteIOContext *pb = &s->pb;
+ unsigned int fourcc_tag;
+ unsigned int size;
+ int header_size;
+ FourxmDemuxContext *fourxm = (FourxmDemuxContext *)s->priv_data;
+ unsigned char *header;
+ int i;
+ int current_track = -1;
+ AVStream *st;
+
+ fourxm->track_count = 0;
+ fourxm->tracks = NULL;
+ fourxm->selected_track = 0;
+
+ /* skip the first 3 32-bit numbers */
+ url_fseek(pb, 12, SEEK_CUR);
+
+ /* check for LIST-HEAD */
+ GET_LIST_HEADER();
+ header_size = size - 4;
+ if (fourcc_tag != HEAD_TAG)
+ return AVERROR_INVALIDDATA;
+
+ /* allocate space for the header and load the whole thing */
+ header = av_malloc(header_size);
+ if (!header)
+ return AVERROR_NOMEM;
+ if (get_buffer(pb, header, header_size) != header_size)
+ return AVERROR_IO;
+
+ /* take the lazy approach and search for any and all vtrk and strk chunks */
+ for (i = 0; i < header_size - 8; i++) {
+ fourcc_tag = LE_32(&header[i]);
+ size = LE_32(&header[i + 4]);
+
+ if (fourcc_tag == vtrk_TAG) {
+ /* check that there is enough data */
+ if (size != vtrk_SIZE) {
+ av_free(header);
+ return AVERROR_INVALIDDATA;
+ }
+ fourxm->width = LE_32(&header[i + 36]);
+ fourxm->height = LE_32(&header[i + 40]);
+ i += 8 + size;
+
+ /* allocate a new AVStream */
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR_NOMEM;
+
+ fourxm->video_stream_index = st->index;
+
+ st->codec.codec_type = CODEC_TYPE_VIDEO;
+ st->codec.codec_id = CODEC_ID_4XM;
+ st->codec.codec_tag = 0; /* no fourcc */
+ st->codec.width = fourxm->width;
+ st->codec.height = fourxm->height;
+
+ } else if (fourcc_tag == strk_TAG) {
+ /* check that there is enough data */
+ if (size != strk_SIZE) {
+ av_free(header);
+ return AVERROR_INVALIDDATA;
+ }
+ current_track = LE_32(&header[i + 8]);
+ if (current_track + 1 > fourxm->track_count) {
+ fourxm->track_count = current_track + 1;
+ fourxm->tracks = av_realloc(fourxm->tracks,
+ fourxm->track_count * sizeof(AudioTrack));
+ if (!fourxm->tracks) {
+ av_free(header);
+ return AVERROR_NOMEM;
+ }
+ }
+ fourxm->tracks[current_track].adpcm = LE_32(&header[i + 12]);
+ fourxm->tracks[current_track].channels = LE_32(&header[i + 36]);
+ fourxm->tracks[current_track].sample_rate = LE_32(&header[i + 40]);
+ fourxm->tracks[current_track].bits = LE_32(&header[i + 44]);
+ printf("bps:%d\n", fourxm->tracks[current_track].bits);
+ i += 8 + size;
+
+ /* allocate a new AVStream */
+ st = av_new_stream(s, current_track);
+ if (!st)
+ return AVERROR_NOMEM;
+
+ fourxm->tracks[current_track].stream_index = st->index;
+
+ st->codec.codec_type = CODEC_TYPE_AUDIO;
+ st->codec.codec_tag = 1;
+ st->codec.channels = fourxm->tracks[current_track].channels;
+ st->codec.sample_rate = fourxm->tracks[current_track].sample_rate;
+ st->codec.bits_per_sample = fourxm->tracks[current_track].bits;
+ st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
+ st->codec.bits_per_sample;
+ st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
+ if (fourxm->tracks[current_track].adpcm)
+ st->codec.codec_id = CODEC_ID_ADPCM_4XM;
+ else if (st->codec.bits_per_sample == 8)
+ st->codec.codec_id = CODEC_ID_PCM_U8;
+ else
+ st->codec.codec_id = CODEC_ID_PCM_S16LE;
+ }
+ }
+
+ av_free(header);
+
+ /* skip over the LIST-MOVI chunk (which is where the stream should be */
+ GET_LIST_HEADER();
+ if (fourcc_tag != MOVI_TAG)
+ return AVERROR_INVALIDDATA;
+
+ /* initialize context members */
+ fourxm->pts = 0;
+ fourxm->last_chunk_was_audio = 0;
+ fourxm->last_audio_frame_count = 0;
+
+ /* set the pts reference (1 pts = 1/90000) */
+ s->pts_num = 1;
+ s->pts_den = 90000;
+
+ return 0;
+}
+
+static int fourxm_read_packet(AVFormatContext *s,
+ AVPacket *pkt)
+{
+ FourxmDemuxContext *fourxm = s->priv_data;
+ ByteIOContext *pb = &s->pb;
+ unsigned int fourcc_tag;
+ unsigned int size, out_size;
+ int ret = 0;
+ int track_number;
+ int packet_read = 0;
+ unsigned char header[8];
+ int64_t pts_inc;
+
+ while (!packet_read) {
+
+ if ((ret = get_buffer(&s->pb, header, 8)) < 0)
+ return ret;
+ fourcc_tag = LE_32(&header[0]);
+ size = LE_32(&header[4]);
+ if (url_feof(pb))
+ return -EIO;
+ switch (fourcc_tag) {
+
+ case LIST_TAG:
+ /* skip the LIST-* tag and move on to the next fourcc */
+ get_le32(pb);
+ break;
+
+ case ifrm_TAG:
+ case pfrm_TAG:
+ case cfrm_TAG:{
+
+ /* bump the pts if the last data sent out was audio */
+ if (fourxm->last_chunk_was_audio) {
+ fourxm->last_chunk_was_audio = 0;
+ pts_inc = fourxm->last_audio_frame_count;
+ pts_inc *= 90000;
+ pts_inc /= fourxm->tracks[fourxm->selected_track].sample_rate;
+ fourxm->pts += pts_inc;
+ }
+
+ /* allocate 8 more bytes than 'size' to account for fourcc
+ * and size */
+ if (av_new_packet(pkt, size + 8))
+ return -EIO;
+ pkt->stream_index = fourxm->video_stream_index;
+ pkt->pts = fourxm->pts;
+ memcpy(pkt->data, header, 8);
+ ret = get_buffer(&s->pb, &pkt->data[8], size);
+
+ if (ret < 0)
+ av_free_packet(pkt);
+ else
+ packet_read = 1;
+ break;
+ }
+
+ case snd__TAG:
+ track_number = get_le32(pb);
+ out_size= get_le32(pb);
+ size-=8;
+
+ if (track_number == fourxm->selected_track) {
+ if (av_new_packet(pkt, size))
+ return -EIO;
+ pkt->stream_index =
+ fourxm->tracks[fourxm->selected_track].stream_index;
+ pkt->pts = fourxm->pts;
+ ret = get_buffer(&s->pb, pkt->data, size);
+ if (ret < 0)
+ av_free_packet(pkt);
+ else
+ packet_read = 1;
+
+ /* maintain pts info for the benefit of the video track */
+ fourxm->last_chunk_was_audio = 1;
+ fourxm->last_audio_frame_count = size /
+ ((fourxm->tracks[fourxm->selected_track].bits / 8) *
+ fourxm->tracks[fourxm->selected_track].channels);
+
+ } else {
+ url_fseek(pb, size, SEEK_CUR);
+ }
+ break;
+
+ default:
+ url_fseek(pb, size, SEEK_CUR);
+ break;
+ }
+ }
+ return ret;
+}
+
+static int fourxm_read_close(AVFormatContext *s)
+{
+ FourxmDemuxContext *fourxm = (FourxmDemuxContext *)s->priv_data;
+
+ av_free(fourxm->tracks);
+
+ return 0;
+}
+
+static AVInputFormat fourxm_iformat = {
+ "4xm",
+ "4X Technologies format",
+ sizeof(FourxmDemuxContext),
+ fourxm_probe,
+ fourxm_read_header,
+ fourxm_read_packet,
+ fourxm_read_close,
+};
+
+int fourxm_init(void)
+{
+ av_register_input_format(&fourxm_iformat);
+ return 0;
+}
projects / synfig.git / blobdiff