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ffmpeg / libavformat / vocenc.c @ 2912e87a

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/*
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 * Creative Voice File muxer.
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 * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
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 *
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 * This file is part of Libav.
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 *
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 * Libav 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 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav 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 Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "voc.h"
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#include "internal.h"
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typedef struct voc_enc_context {
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    int param_written;
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} VocEncContext;
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static int voc_write_header(AVFormatContext *s)
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{
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    AVIOContext *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 != AVMEDIA_TYPE_AUDIO)
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        return AVERROR_PATCHWELCOME;
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    avio_write(pb, ff_voc_magic, sizeof(ff_voc_magic) - 1);
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    avio_wl16(pb, header_size);
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    avio_wl16(pb, version);
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    avio_wl16(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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    VocEncContext *voc = s->priv_data;
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    AVCodecContext *enc = s->streams[0]->codec;
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    AVIOContext *pb = s->pb;
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    if (!voc->param_written) {
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        if (enc->codec_tag > 0xFF) {
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            avio_w8(pb, VOC_TYPE_NEW_VOICE_DATA);
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            avio_wl24(pb, pkt->size + 12);
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            avio_wl32(pb, enc->sample_rate);
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            avio_w8(pb, enc->bits_per_coded_sample);
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            avio_w8(pb, enc->channels);
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            avio_wl16(pb, enc->codec_tag);
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            avio_wl32(pb, 0);
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        } else {
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            if (s->streams[0]->codec->channels > 1) {
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                avio_w8(pb, VOC_TYPE_EXTENDED);
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                avio_wl24(pb, 4);
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                avio_wl16(pb, 65536-256000000/(enc->sample_rate*enc->channels));
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                avio_w8(pb, enc->codec_tag);
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                avio_w8(pb, enc->channels - 1);
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            }
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            avio_w8(pb, VOC_TYPE_VOICE_DATA);
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            avio_wl24(pb, pkt->size + 2);
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            avio_w8(pb, 256 - 1000000 / enc->sample_rate);
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            avio_w8(pb, enc->codec_tag);
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        }
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        voc->param_written = 1;
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    } else {
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        avio_w8(pb, VOC_TYPE_VOICE_DATA_CONT);
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        avio_wl24(pb, pkt->size);
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    }
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    avio_write(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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    avio_w8(s->pb, 0);
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    return 0;
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}
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AVOutputFormat ff_voc_muxer = {
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    "voc",
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    NULL_IF_CONFIG_SMALL("Creative Voice file format"),
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    "audio/x-voc",
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    "voc",
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    sizeof(VocEncContext),
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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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    .codec_tag=(const AVCodecTag* const []){ff_voc_codec_tags, 0},
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};