297 lines
7.8 KiB
C
297 lines
7.8 KiB
C
/*
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* Creative Voice File demuxer.
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* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "avi.h" /* for CodecTag */
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#include "voc.h"
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typedef enum voc_type {
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VOC_TYPE_EOF = 0x00,
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VOC_TYPE_VOICE_DATA = 0x01,
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VOC_TYPE_VOICE_DATA_CONT = 0x02,
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VOC_TYPE_SILENCE = 0x03,
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VOC_TYPE_MARKER = 0x04,
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VOC_TYPE_ASCII = 0x05,
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VOC_TYPE_REPETITION_START = 0x06,
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VOC_TYPE_REPETITION_END = 0x07,
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VOC_TYPE_EXTENDED = 0x08,
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VOC_TYPE_NEW_VOICE_DATA = 0x09,
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} voc_type_t;
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static const int voc_max_pkt_size = 2048;
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static const unsigned char voc_magic[] = "Creative Voice File\x1A";
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static const CodecTag voc_codec_tags[] = {
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{CODEC_ID_PCM_U8, 0x00},
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{CODEC_ID_ADPCM_SBPRO_4, 0x01},
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{CODEC_ID_ADPCM_SBPRO_3, 0x02},
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{CODEC_ID_ADPCM_SBPRO_2, 0x03},
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{CODEC_ID_PCM_S16LE, 0x04},
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{CODEC_ID_PCM_ALAW, 0x06},
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{CODEC_ID_PCM_MULAW, 0x07},
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{CODEC_ID_ADPCM_CT, 0x0200},
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{0, 0},
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};
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#ifdef CONFIG_DEMUXERS
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static int voc_probe(AVProbeData *p)
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{
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int version, check;
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if (p->buf_size < 26)
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return 0;
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if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1))
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return 0;
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version = p->buf[22] | (p->buf[23] << 8);
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check = p->buf[24] | (p->buf[25] << 8);
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if (~version + 0x1234 != check)
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return 10;
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return AVPROBE_SCORE_MAX;
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}
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static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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voc_dec_context_t *voc = s->priv_data;
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ByteIOContext *pb = &s->pb;
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int header_size;
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AVStream *st;
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url_fskip(pb, 20);
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header_size = get_le16(pb) - 22;
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if (header_size != 4) {
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av_log(s, AV_LOG_ERROR, "unkown header size: %d\n", header_size);
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return AVERROR_NOTSUPP;
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}
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url_fskip(pb, header_size);
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR_NOMEM;
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st->codec->codec_type = CODEC_TYPE_AUDIO;
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voc->remaining_size = 0;
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return 0;
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}
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static int voc_get_bps(int codec_id)
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{
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switch (codec_id) {
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case CODEC_ID_PCM_S16LE:
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return 16;
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case CODEC_ID_ADPCM_CT:
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return 4;
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default:
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return 8;
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}
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}
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int
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voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
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{
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voc_dec_context_t *voc = s->priv_data;
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AVCodecContext *dec = st->codec;
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ByteIOContext *pb = &s->pb;
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voc_type_t type;
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int size;
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int sample_rate = 0;
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int channels = 1;
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while (!voc->remaining_size) {
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type = get_byte(pb);
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if (type == VOC_TYPE_EOF)
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return AVERROR_IO;
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voc->remaining_size = get_le24(pb);
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max_size -= 4;
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switch (type) {
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case VOC_TYPE_VOICE_DATA:
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dec->sample_rate = 1000000 / (256 - get_byte(pb));
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if (sample_rate)
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dec->sample_rate = sample_rate;
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dec->channels = channels;
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dec->codec_id = codec_get_id(voc_codec_tags, get_byte(pb));
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dec->bits_per_sample = voc_get_bps(dec->codec_id);
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voc->remaining_size -= 2;
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max_size -= 2;
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channels = 1;
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break;
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case VOC_TYPE_VOICE_DATA_CONT:
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break;
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case VOC_TYPE_EXTENDED:
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sample_rate = get_le16(pb);
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get_byte(pb);
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channels = get_byte(pb) + 1;
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sample_rate = 256000000 / (channels * (65536 - sample_rate));
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voc->remaining_size = 0;
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max_size -= 4;
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break;
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case VOC_TYPE_NEW_VOICE_DATA:
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dec->sample_rate = get_le32(pb);
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dec->bits_per_sample = get_byte(pb);
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dec->channels = get_byte(pb);
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dec->codec_id = codec_get_id(voc_codec_tags, get_le16(pb));
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url_fskip(pb, 4);
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voc->remaining_size -= 12;
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max_size -= 12;
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break;
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default:
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url_fskip(pb, voc->remaining_size);
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max_size -= voc->remaining_size;
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voc->remaining_size = 0;
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break;
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}
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}
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dec->bit_rate = dec->sample_rate * dec->bits_per_sample;
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if (max_size <= 0)
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max_size = voc_max_pkt_size;
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size = FFMIN(voc->remaining_size, max_size);
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voc->remaining_size -= size;
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return av_get_packet(pb, pkt, size);
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}
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static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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return voc_get_packet(s, pkt, s->streams[0], 0);
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}
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static int voc_read_close(AVFormatContext *s)
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{
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return 0;
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}
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static AVInputFormat voc_iformat = {
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"voc",
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"Creative Voice File format",
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sizeof(voc_dec_context_t),
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voc_probe,
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voc_read_header,
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voc_read_packet,
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voc_read_close,
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};
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#endif /* CONFIG_DEMUXERS */
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#ifdef CONFIG_MUXERS
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typedef struct voc_enc_context {
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int param_written;
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} voc_enc_context_t;
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static int voc_write_header(AVFormatContext *s)
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{
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ByteIOContext *pb = &s->pb;
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const int header_size = 26;
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const int version = 0x0114;
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if (s->nb_streams != 1
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|| s->streams[0]->codec->codec_type != CODEC_TYPE_AUDIO)
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return AVERROR_NOTSUPP;
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put_buffer(pb, voc_magic, sizeof(voc_magic) - 1);
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put_le16(pb, header_size);
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put_le16(pb, version);
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put_le16(pb, ~version + 0x1234);
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return 0;
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}
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static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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voc_enc_context_t *voc = s->priv_data;
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AVCodecContext *enc = s->streams[0]->codec;
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ByteIOContext *pb = &s->pb;
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if (!voc->param_written) {
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int format = codec_get_tag(voc_codec_tags, enc->codec_id);
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if (format > 0xFF) {
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put_byte(pb, VOC_TYPE_NEW_VOICE_DATA);
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put_le24(pb, pkt->size + 12);
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put_le32(pb, enc->sample_rate);
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put_byte(pb, enc->bits_per_sample);
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put_byte(pb, enc->channels);
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put_le16(pb, format);
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put_le32(pb, 0);
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} else {
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if (s->streams[0]->codec->channels > 1) {
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put_byte(pb, VOC_TYPE_EXTENDED);
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put_le24(pb, 4);
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put_le16(pb, 65536-256000000/(enc->sample_rate*enc->channels));
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put_byte(pb, format);
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put_byte(pb, enc->channels - 1);
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}
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put_byte(pb, VOC_TYPE_VOICE_DATA);
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put_le24(pb, pkt->size + 2);
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put_byte(pb, 256 - 1000000 / enc->sample_rate);
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put_byte(pb, format);
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}
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voc->param_written = 1;
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} else {
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put_byte(pb, VOC_TYPE_VOICE_DATA_CONT);
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put_le24(pb, pkt->size);
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}
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put_buffer(pb, pkt->data, pkt->size);
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return 0;
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}
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static int voc_write_trailer(AVFormatContext *s)
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{
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put_byte(&s->pb, 0);
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return 0;
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}
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static AVOutputFormat voc_oformat = {
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"voc",
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"Creative Voice File format",
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"audio/x-voc",
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"voc",
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sizeof(voc_enc_context_t),
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CODEC_ID_PCM_U8,
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CODEC_ID_NONE,
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voc_write_header,
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voc_write_packet,
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voc_write_trailer,
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};
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#endif /* CONFIG_MUXERS */
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int voc_init(void)
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{
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#ifdef CONFIG_DEMUXERS
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av_register_input_format(&voc_iformat);
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#endif /* CONFIG_DEMUXERS */
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#ifdef CONFIG_MUXERS
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av_register_output_format(&voc_oformat);
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#endif /* CONFIG_MUXERS */
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return 0;
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}
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