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- /*
- * Creative Voice File demuxer.
- * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- #include "libavutil/intreadwrite.h"
- #include "voc.h"
- #include "internal.h"
- static int voc_probe(AVProbeData *p)
- {
- int version, check;
- if (memcmp(p->buf, ff_voc_magic, sizeof(ff_voc_magic) - 1))
- return 0;
- version = AV_RL16(p->buf + 22);
- check = AV_RL16(p->buf + 24);
- if (~version + 0x1234 != check)
- return 10;
- return AVPROBE_SCORE_MAX;
- }
- static int voc_read_header(AVFormatContext *s)
- {
- VocDecContext *voc = s->priv_data;
- AVIOContext *pb = s->pb;
- int header_size;
- AVStream *st;
- avio_skip(pb, 20);
- header_size = avio_rl16(pb) - 22;
- if (header_size != 4) {
- av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size);
- return AVERROR(ENOSYS);
- }
- avio_skip(pb, header_size);
- st = avformat_new_stream(s, NULL);
- if (!st)
- return AVERROR(ENOMEM);
- st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- voc->remaining_size = 0;
- return 0;
- }
- int
- ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
- {
- VocDecContext *voc = s->priv_data;
- AVCodecContext *dec = st->codec;
- AVIOContext *pb = s->pb;
- VocType type;
- int size, tmp_codec=-1;
- int sample_rate = 0;
- int channels = 1;
- while (!voc->remaining_size) {
- type = avio_r8(pb);
- if (type == VOC_TYPE_EOF)
- return AVERROR(EIO);
- voc->remaining_size = avio_rl24(pb);
- if (!voc->remaining_size) {
- if (!s->pb->seekable)
- return AVERROR(EIO);
- voc->remaining_size = avio_size(pb) - avio_tell(pb);
- }
- max_size -= 4;
- switch (type) {
- case VOC_TYPE_VOICE_DATA:
- if (!dec->sample_rate) {
- dec->sample_rate = 1000000 / (256 - avio_r8(pb));
- if (sample_rate)
- dec->sample_rate = sample_rate;
- avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
- } else
- avio_skip(pb, 1);
- dec->channels = channels;
- tmp_codec = avio_r8(pb);
- dec->bits_per_coded_sample = av_get_bits_per_sample(dec->codec_id);
- voc->remaining_size -= 2;
- max_size -= 2;
- channels = 1;
- break;
- case VOC_TYPE_VOICE_DATA_CONT:
- break;
- case VOC_TYPE_EXTENDED:
- sample_rate = avio_rl16(pb);
- avio_r8(pb);
- channels = avio_r8(pb) + 1;
- sample_rate = 256000000 / (channels * (65536 - sample_rate));
- voc->remaining_size = 0;
- max_size -= 4;
- break;
- case VOC_TYPE_NEW_VOICE_DATA:
- if (!dec->sample_rate) {
- dec->sample_rate = avio_rl32(pb);
- avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
- } else
- avio_skip(pb, 4);
- dec->bits_per_coded_sample = avio_r8(pb);
- dec->channels = avio_r8(pb);
- tmp_codec = avio_rl16(pb);
- avio_skip(pb, 4);
- voc->remaining_size -= 12;
- max_size -= 12;
- break;
- default:
- avio_skip(pb, voc->remaining_size);
- max_size -= voc->remaining_size;
- voc->remaining_size = 0;
- break;
- }
- }
- if (tmp_codec >= 0) {
- tmp_codec = ff_codec_get_id(ff_voc_codec_tags, tmp_codec);
- if (dec->codec_id == AV_CODEC_ID_NONE)
- dec->codec_id = tmp_codec;
- else if (dec->codec_id != tmp_codec)
- av_log(s, AV_LOG_WARNING, "Ignoring mid-stream change in audio codec\n");
- if (dec->codec_id == AV_CODEC_ID_NONE) {
- if (s->audio_codec_id == AV_CODEC_ID_NONE) {
- av_log(s, AV_LOG_ERROR, "unknown codec tag\n");
- return AVERROR(EINVAL);
- }
- av_log(s, AV_LOG_WARNING, "unknown codec tag\n");
- }
- }
- dec->bit_rate = dec->sample_rate * dec->channels * dec->bits_per_coded_sample;
- if (max_size <= 0)
- max_size = 2048;
- 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 ff_voc_get_packet(s, pkt, s->streams[0], 0);
- }
- AVInputFormat ff_voc_demuxer = {
- .name = "voc",
- .long_name = NULL_IF_CONFIG_SMALL("Creative Voice"),
- .priv_data_size = sizeof(VocDecContext),
- .read_probe = voc_probe,
- .read_header = voc_read_header,
- .read_packet = voc_read_packet,
- .codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 },
- };
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