--- /dev/null
+/*
+ * Creative Voice File demuxer.
+ * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avformat.h"
+#include "avi.h" /* for CodecTag */
+#include "voc.h"
+
+
+typedef enum voc_type {
+ VOC_TYPE_EOF = 0x00,
+ VOC_TYPE_VOICE_DATA = 0x01,
+ VOC_TYPE_VOICE_DATA_CONT = 0x02,
+ VOC_TYPE_SILENCE = 0x03,
+ VOC_TYPE_MARKER = 0x04,
+ VOC_TYPE_ASCII = 0x05,
+ VOC_TYPE_REPETITION_START = 0x06,
+ VOC_TYPE_REPETITION_END = 0x07,
+ VOC_TYPE_EXTENDED = 0x08,
+ VOC_TYPE_NEW_VOICE_DATA = 0x09,
+} voc_type_t;
+
+
+static const int voc_max_pkt_size = 2048;
+static const unsigned char voc_magic[] = "Creative Voice File\x1A";
+
+static const CodecTag voc_codec_tags[] = {
+ {CODEC_ID_PCM_U8, 0x00},
+ {CODEC_ID_PCM_S16LE, 0x04},
+ {CODEC_ID_PCM_ALAW, 0x06},
+ {CODEC_ID_PCM_MULAW, 0x07},
+ {CODEC_ID_ADPCM_CT, 0x0200},
+ {0, 0},
+};
+
+
+#ifdef CONFIG_DEMUXERS
+
+static int voc_probe(AVProbeData *p)
+{
+ int version, check;
+
+ if (p->buf_size < 26)
+ return 0;
+ if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1))
+ return 0;
+ version = p->buf[22] | (p->buf[23] << 8);
+ check = p->buf[24] | (p->buf[25] << 8);
+ if (~version + 0x1234 != check)
+ return 10;
+
+ return AVPROBE_SCORE_MAX;
+}
+
+static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+ voc_dec_context_t *voc = s->priv_data;
+ ByteIOContext *pb = &s->pb;
+ int header_size;
+ AVStream *st;
+
+ url_fskip(pb, 20);
+ header_size = get_le16(pb) - 22;
+ if (header_size != 4) {
+ av_log(s, AV_LOG_ERROR, "unkown header size: %d\n", header_size);
+ return AVERROR_NOTSUPP;
+ }
+ url_fskip(pb, header_size);
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR_NOMEM;
+ st->codec->codec_type = CODEC_TYPE_AUDIO;
+
+ voc->remaining_size = 0;
+ return 0;
+}
+
+int
+voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
+{
+ voc_dec_context_t *voc = s->priv_data;
+ AVCodecContext *dec = st->codec;
+ ByteIOContext *pb = &s->pb;
+ voc_type_t type;
+ int size;
+ int sample_rate = 0;
+ int channels = 1;
+
+ while (!voc->remaining_size) {
+ type = get_byte(pb);
+ if (type == VOC_TYPE_EOF)
+ return AVERROR_IO;
+ voc->remaining_size = get_le24(pb);
+ max_size -= 4;
+
+ switch (type) {
+ case VOC_TYPE_VOICE_DATA:
+ dec->sample_rate = 1000000 / (256 - get_byte(pb));
+ if (sample_rate)
+ dec->sample_rate = sample_rate;
+ dec->channels = channels;
+ dec->codec_id = codec_get_id(voc_codec_tags, get_byte(pb));
+ voc->remaining_size -= 2;
+ max_size -= 2;
+ channels = 1;
+ break;
+
+ case VOC_TYPE_VOICE_DATA_CONT:
+ break;
+
+ case VOC_TYPE_EXTENDED:
+ sample_rate = get_le16(pb);
+ get_byte(pb);
+ channels = get_byte(pb) + 1;
+ sample_rate = 256000000 / (channels * (65536 - sample_rate));
+ voc->remaining_size = 0;
+ max_size -= 4;
+ break;
+
+ case VOC_TYPE_NEW_VOICE_DATA:
+ dec->sample_rate = get_le32(pb);
+ dec->bits_per_sample = get_byte(pb);
+ dec->channels = get_byte(pb);
+ dec->codec_id = codec_get_id(voc_codec_tags, get_le16(pb));
+ url_fskip(pb, 4);
+ voc->remaining_size -= 12;
+ max_size -= 12;
+ break;
+
+ default:
+ url_fskip(pb, voc->remaining_size);
+ max_size -= voc->remaining_size;
+ voc->remaining_size = 0;
+ break;
+ }
+ }
+
+ dec->bit_rate = dec->sample_rate * dec->bits_per_sample;
+
+ if (max_size <= 0)
+ max_size = voc_max_pkt_size;
+ size = FFMIN(voc->remaining_size, max_size);
+ voc->remaining_size -= size;
+ return av_get_packet(pb, pkt, size);
+}
+
+static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ return voc_get_packet(s, pkt, s->streams[0], 0);
+}
+
+static int voc_read_close(AVFormatContext *s)
+{
+ return 0;
+}
+
+static AVInputFormat voc_iformat = {
+ "voc",
+ "Creative Voice File format",
+ sizeof(voc_dec_context_t),
+ voc_probe,
+ voc_read_header,
+ voc_read_packet,
+ voc_read_close,
+};
+
+#endif /* CONFIG_DEMUXERS */
+
+
+#ifdef CONFIG_MUXERS
+
+typedef struct voc_enc_context {
+ int param_written;
+} voc_enc_context_t;
+
+static int voc_write_header(AVFormatContext *s)
+{
+ ByteIOContext *pb = &s->pb;
+ const int header_size = 26;
+ const int version = 0x0114;
+
+ if (s->nb_streams != 1
+ || s->streams[0]->codec->codec_type != CODEC_TYPE_AUDIO)
+ return AVERROR_NOTSUPP;
+
+ put_buffer(pb, voc_magic, sizeof(voc_magic) - 1);
+ put_le16(pb, header_size);
+ put_le16(pb, version);
+ put_le16(pb, ~version + 0x1234);
+
+ return 0;
+}
+
+static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ voc_enc_context_t *voc = s->priv_data;
+ AVCodecContext *enc = s->streams[0]->codec;
+ ByteIOContext *pb = &s->pb;
+
+ if (!voc->param_written) {
+ int format = codec_get_tag(voc_codec_tags, enc->codec_id);
+
+ if (format > 0xFF) {
+ put_byte(pb, VOC_TYPE_NEW_VOICE_DATA);
+ put_le24(pb, pkt->size + 12);
+ put_le32(pb, enc->sample_rate);
+ put_byte(pb, enc->bits_per_sample);
+ put_byte(pb, enc->channels);
+ put_le16(pb, format);
+ put_le32(pb, 0);
+ } else {
+ if (s->streams[0]->codec->channels > 1) {
+ put_byte(pb, VOC_TYPE_EXTENDED);
+ put_le24(pb, 4);
+ put_le16(pb, 65536-256000000/(enc->sample_rate*enc->channels));
+ put_byte(pb, format);
+ put_byte(pb, enc->channels - 1);
+ }
+ put_byte(pb, VOC_TYPE_VOICE_DATA);
+ put_le24(pb, pkt->size + 2);
+ put_byte(pb, 256 - 1000000 / enc->sample_rate);
+ put_byte(pb, format);
+ }
+ voc->param_written = 1;
+ } else {
+ put_byte(pb, VOC_TYPE_VOICE_DATA_CONT);
+ put_le24(pb, pkt->size);
+ }
+
+ put_buffer(pb, pkt->data, pkt->size);
+ return 0;
+}
+
+static int voc_write_trailer(AVFormatContext *s)
+{
+ put_byte(&s->pb, 0);
+ return 0;
+}
+
+static AVOutputFormat voc_oformat = {
+ "voc",
+ "Creative Voice File format",
+ "audio/x-voc",
+ "voc",
+ sizeof(voc_enc_context_t),
+ CODEC_ID_PCM_U8,
+ CODEC_ID_NONE,
+ voc_write_header,
+ voc_write_packet,
+ voc_write_trailer,
+};
+
+#endif /* CONFIG_MUXERS */
+
+
+int voc_init(void)
+{
+#ifdef CONFIG_DEMUXERS
+ av_register_input_format(&voc_iformat);
+#endif /* CONFIG_DEMUXERS */
+#ifdef CONFIG_MUXERS
+ av_register_output_format(&voc_oformat);
+#endif /* CONFIG_MUXERS */
+ return 0;
+}
projects / platform / upstream / libav.git / commitdiff