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ffmpeg / libavformat / aiffenc.c @ 47b47bbd

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/*
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 * AIFF/AIFF-C muxer
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 * Copyright (c) 2006  Patrick Guimond
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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 "avformat.h"
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#include "aiff.h"
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typedef struct {
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    int64_t form;
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    int64_t frames;
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    int64_t ssnd;
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} AIFFOutputContext;
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static int aiff_write_header(AVFormatContext *s)
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{
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    AIFFOutputContext *aiff = s->priv_data;
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    ByteIOContext *pb = s->pb;
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    AVCodecContext *enc = s->streams[0]->codec;
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    AVExtFloat sample_rate;
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    int aifc = 0;
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    /* First verify if format is ok */
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    if (!enc->codec_tag)
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        return -1;
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    if (enc->codec_tag != MKTAG('N','O','N','E'))
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        aifc = 1;
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    /* FORM AIFF header */
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    put_tag(pb, "FORM");
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    aiff->form = url_ftell(pb);
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    put_be32(pb, 0);                    /* file length */
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    put_tag(pb, aifc ? "AIFC" : "AIFF");
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    if (aifc) { // compressed audio
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        enc->bits_per_coded_sample = 16;
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        if (!enc->block_align) {
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            av_log(s, AV_LOG_ERROR, "block align not set\n");
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            return -1;
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        }
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        /* Version chunk */
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        put_tag(pb, "FVER");
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        put_be32(pb, 4);
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        put_be32(pb, 0xA2805140);
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    }
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    /* Common chunk */
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    put_tag(pb, "COMM");
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    put_be32(pb, aifc ? 24 : 18); /* size */
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    put_be16(pb, enc->channels);  /* Number of channels */
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    aiff->frames = url_ftell(pb);
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    put_be32(pb, 0);              /* Number of frames */
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    if (!enc->bits_per_coded_sample)
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        enc->bits_per_coded_sample = av_get_bits_per_sample(enc->codec_id);
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    if (!enc->bits_per_coded_sample) {
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        av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");
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        return -1;
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    }
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    if (!enc->block_align)
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        enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;
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    put_be16(pb, enc->bits_per_coded_sample); /* Sample size */
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    sample_rate = av_dbl2ext((double)enc->sample_rate);
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    put_buffer(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
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    if (aifc) {
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        put_le32(pb, enc->codec_tag);
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        put_be16(pb, 0);
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    }
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    /* Sound data chunk */
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    put_tag(pb, "SSND");
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    aiff->ssnd = url_ftell(pb);         /* Sound chunk size */
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    put_be32(pb, 0);                    /* Sound samples data size */
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    put_be32(pb, 0);                    /* Data offset */
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    put_be32(pb, 0);                    /* Block-size (block align) */
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    av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
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    /* Data is starting here */
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    put_flush_packet(pb);
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    return 0;
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}
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static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    ByteIOContext *pb = s->pb;
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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 aiff_write_trailer(AVFormatContext *s)
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{
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    ByteIOContext *pb = s->pb;
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    AIFFOutputContext *aiff = s->priv_data;
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    AVCodecContext *enc = s->streams[0]->codec;
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    /* Chunks sizes must be even */
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    int64_t file_size, end_size;
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    end_size = file_size = url_ftell(pb);
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    if (file_size & 1) {
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        put_byte(pb, 0);
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        end_size++;
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    }
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    if (!url_is_streamed(s->pb)) {
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        /* File length */
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        url_fseek(pb, aiff->form, SEEK_SET);
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        put_be32(pb, file_size - aiff->form - 4);
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        /* Number of sample frames */
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        url_fseek(pb, aiff->frames, SEEK_SET);
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        put_be32(pb, (file_size-aiff->ssnd-12)/enc->block_align);
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        /* Sound Data chunk size */
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        url_fseek(pb, aiff->ssnd, SEEK_SET);
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        put_be32(pb, file_size - aiff->ssnd - 4);
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        /* return to the end */
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        url_fseek(pb, end_size, SEEK_SET);
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        put_flush_packet(pb);
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    }
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    return 0;
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}
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AVOutputFormat aiff_muxer = {
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    "aiff",
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    NULL_IF_CONFIG_SMALL("Audio IFF"),
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    "audio/aiff",
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    "aif,aiff,afc,aifc",
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    sizeof(AIFFOutputContext),
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    CODEC_ID_PCM_S16BE,
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    CODEC_ID_NONE,
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    aiff_write_header,
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    aiff_write_packet,
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    aiff_write_trailer,
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    .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0},
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};