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ffmpeg / libavformat / aiff.c @ d7fb5a18

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/*
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 * AIFF/AIFF-C muxer and demuxer
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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 "libavutil/intfloat_readwrite.h"
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#include "avformat.h"
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#include "raw.h"
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#include "riff.h"
26

    
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static const AVCodecTag codec_aiff_tags[] = {
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    { CODEC_ID_PCM_S16BE,    MKTAG('N','O','N','E') },
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    { CODEC_ID_PCM_S8,       MKTAG('N','O','N','E') },
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    { CODEC_ID_PCM_S24BE,    MKTAG('N','O','N','E') },
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    { CODEC_ID_PCM_S32BE,    MKTAG('N','O','N','E') },
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    { CODEC_ID_PCM_F32BE,    MKTAG('f','l','3','2') },
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    { CODEC_ID_PCM_F64BE,    MKTAG('f','l','6','4') },
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    { CODEC_ID_PCM_ALAW,     MKTAG('a','l','a','w') },
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    { CODEC_ID_PCM_MULAW,    MKTAG('u','l','a','w') },
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    { CODEC_ID_MACE3,        MKTAG('M','A','C','3') },
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    { CODEC_ID_MACE6,        MKTAG('M','A','C','6') },
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    { CODEC_ID_GSM,          MKTAG('G','S','M',' ') },
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    { CODEC_ID_ADPCM_G726,   MKTAG('G','7','2','6') },
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    { CODEC_ID_PCM_S16LE,    MKTAG('s','o','w','t') },
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    { CODEC_ID_ADPCM_IMA_QT, MKTAG('i','m','a','4') },
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    { CODEC_ID_QDM2,         MKTAG('Q','D','M','2') },
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    { 0, 0 },
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};
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#define AIFF                    0
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#define AIFF_C_VERSION1         0xA2805140
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static enum CodecID aiff_codec_get_id(int bps)
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{
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    if (bps <= 8)
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        return CODEC_ID_PCM_S8;
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    if (bps <= 16)
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        return CODEC_ID_PCM_S16BE;
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    if (bps <= 24)
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        return CODEC_ID_PCM_S24BE;
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    if (bps <= 32)
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        return CODEC_ID_PCM_S32BE;
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    /* bigger than 32 isn't allowed  */
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    return CODEC_ID_NONE;
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}
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/* returns the size of the found tag */
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static int get_tag(ByteIOContext *pb, uint32_t * tag)
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{
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    int size;
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    if (url_feof(pb))
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        return AVERROR(EIO);
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    *tag = get_le32(pb);
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    size = get_be32(pb);
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    if (size < 0)
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        size = 0x7fffffff;
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    return size;
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}
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/* Metadata string read */
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static void get_meta(ByteIOContext *pb, char * str, int strsize, int size)
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{
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    int res;
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    if (size > strsize-1)
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        res = get_buffer(pb, (uint8_t*)str, strsize-1);
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    else
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        res = get_buffer(pb, (uint8_t*)str, size);
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    if (res < 0)
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        return;
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    str[res] = 0;
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    if (size & 1)
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        size++;
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    size -= res;
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    if (size)
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        url_fskip(pb, size);
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}
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/* Returns the number of sound data frames or negative on error */
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static unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec,
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                             int size, unsigned version)
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{
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    AVExtFloat ext;
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    double sample_rate;
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    unsigned int num_frames;
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    if (size & 1)
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        size++;
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    codec->codec_type = CODEC_TYPE_AUDIO;
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    codec->channels = get_be16(pb);
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    num_frames = get_be32(pb);
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    codec->bits_per_coded_sample = get_be16(pb);
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    get_buffer(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
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    sample_rate = av_ext2dbl(ext);          /* 80 bits BE IEEE extended float */
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    codec->sample_rate = sample_rate;
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    size -= 18;
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    /* Got an AIFF-C? */
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    if (version == AIFF_C_VERSION1) {
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        codec->codec_tag = get_le32(pb);
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        codec->codec_id  = codec_get_id(codec_aiff_tags, codec->codec_tag);
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        switch (codec->codec_id) {
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        case CODEC_ID_PCM_S16BE:
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            codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
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            codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
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            break;
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        case CODEC_ID_ADPCM_IMA_QT:
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            codec->block_align = 34*codec->channels;
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            codec->frame_size = 64;
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            break;
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        case CODEC_ID_MACE3:
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            codec->block_align = 2*codec->channels;
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            codec->frame_size = 6;
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            break;
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        case CODEC_ID_MACE6:
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            codec->block_align = 1*codec->channels;
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            codec->frame_size = 6;
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            break;
144
        case CODEC_ID_GSM:
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            codec->block_align = 33;
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            codec->frame_size = 160;
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            break;
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        default:
149
            break;
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        }
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        size -= 4;
152
    } else {
153
        /* Need the codec type */
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        codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
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        codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
156
    }
157

    
158
    /* Block align needs to be computed in all cases, as the definition
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     * is specific to applications -> here we use the WAVE format definition */
160
    if (!codec->block_align)
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        codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
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    codec->bit_rate = (codec->frame_size ? codec->sample_rate/codec->frame_size :
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                       codec->sample_rate) * (codec->block_align << 3);
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    /* Chunk is over */
167
    if (size)
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        url_fseek(pb, size, SEEK_CUR);
169

    
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    return num_frames;
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}
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#ifdef CONFIG_AIFF_MUXER
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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;
179

    
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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;
184
    AVCodecContext *enc = s->streams[0]->codec;
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    AVExtFloat sample_rate;
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    int aifc = 0;
187

    
188
    /* First verify if format is ok */
189
    if (!enc->codec_tag)
190
        return -1;
191
    if (enc->codec_tag != MKTAG('N','O','N','E'))
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        aifc = 1;
193

    
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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");
199

    
200
    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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    }
211

    
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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 */
219

    
220
    if (!enc->bits_per_coded_sample)
221
        enc->bits_per_coded_sample = av_get_bits_per_sample(enc->codec_id);
222
    if (!enc->bits_per_coded_sample) {
223
        av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");
224
        return -1;
225
    }
226
    if (!enc->block_align)
227
        enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;
228

    
229
    put_be16(pb, enc->bits_per_coded_sample); /* Sample size */
230

    
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    sample_rate = av_dbl2ext((double)enc->sample_rate);
232
    put_buffer(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
233

    
234
    if (aifc) {
235
        put_le32(pb, enc->codec_tag);
236
        put_be16(pb, 0);
237
    }
238

    
239
    /* Sound data chunk */
240
    put_tag(pb, "SSND");
241
    aiff->ssnd = url_ftell(pb);         /* Sound chunk size */
242
    put_be32(pb, 0);                    /* Sound samples data size */
243
    put_be32(pb, 0);                    /* Data offset */
244
    put_be32(pb, 0);                    /* Block-size (block align) */
245

    
246
    av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
247

    
248
    /* Data is starting here */
249
    put_flush_packet(pb);
250

    
251
    return 0;
252
}
253

    
254
static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
255
{
256
    ByteIOContext *pb = s->pb;
257
    put_buffer(pb, pkt->data, pkt->size);
258
    return 0;
259
}
260

    
261
static int aiff_write_trailer(AVFormatContext *s)
262
{
263
    ByteIOContext *pb = s->pb;
264
    AIFFOutputContext *aiff = s->priv_data;
265
    AVCodecContext *enc = s->streams[0]->codec;
266

    
267
    /* Chunks sizes must be even */
268
    int64_t file_size, end_size;
269
    end_size = file_size = url_ftell(pb);
270
    if (file_size & 1) {
271
        put_byte(pb, 0);
272
        end_size++;
273
    }
274

    
275
    if (!url_is_streamed(s->pb)) {
276
        /* File length */
277
        url_fseek(pb, aiff->form, SEEK_SET);
278
        put_be32(pb, file_size - aiff->form - 4);
279

    
280
        /* Number of sample frames */
281
        url_fseek(pb, aiff->frames, SEEK_SET);
282
        put_be32(pb, (file_size-aiff->ssnd-12)/enc->block_align);
283

    
284
        /* Sound Data chunk size */
285
        url_fseek(pb, aiff->ssnd, SEEK_SET);
286
        put_be32(pb, file_size - aiff->ssnd - 4);
287

    
288
        /* return to the end */
289
        url_fseek(pb, end_size, SEEK_SET);
290

    
291
        put_flush_packet(pb);
292
    }
293

    
294
    return 0;
295
}
296
#endif /* CONFIG_AIFF_MUXER */
297

    
298
static int aiff_probe(AVProbeData *p)
299
{
300
    /* check file header */
301
    if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
302
        p->buf[2] == 'R' && p->buf[3] == 'M' &&
303
        p->buf[8] == 'A' && p->buf[9] == 'I' &&
304
        p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
305
        return AVPROBE_SCORE_MAX;
306
    else
307
        return 0;
308
}
309

    
310
/* aiff input */
311
static int aiff_read_header(AVFormatContext *s,
312
                            AVFormatParameters *ap)
313
{
314
    int size, filesize;
315
    int64_t offset = 0;
316
    uint32_t tag;
317
    unsigned version = AIFF_C_VERSION1;
318
    ByteIOContext *pb = s->pb;
319
    AVStream * st = s->streams[0];
320

    
321
    /* check FORM header */
322
    filesize = get_tag(pb, &tag);
323
    if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
324
        return AVERROR_INVALIDDATA;
325

    
326
    /* AIFF data type */
327
    tag = get_le32(pb);
328
    if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
329
        version = AIFF;
330
    else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
331
        return AVERROR_INVALIDDATA;
332

    
333
    filesize -= 4;
334

    
335
    st = av_new_stream(s, 0);
336
    if (!st)
337
        return AVERROR(ENOMEM);
338

    
339
    while (filesize > 0) {
340
        /* parse different chunks */
341
        size = get_tag(pb, &tag);
342
        if (size < 0)
343
            return size;
344

    
345
        filesize -= size + 8;
346

    
347
        switch (tag) {
348
        case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
349
            /* Then for the complete header info */
350
            st->nb_frames = get_aiff_header(pb, st->codec, size, version);
351
            if (st->nb_frames < 0)
352
                return st->nb_frames;
353
            if (offset > 0) // COMM is after SSND
354
                goto got_sound;
355
            break;
356
        case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
357
            version = get_be32(pb);
358
            break;
359
        case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
360
            get_meta(pb, s->title, sizeof(s->title), size);
361
            break;
362
        case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
363
            get_meta(pb, s->author, sizeof(s->author), size);
364
            break;
365
        case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
366
            get_meta(pb, s->copyright, sizeof(s->copyright), size);
367
            break;
368
        case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
369
            get_meta(pb, s->comment, sizeof(s->comment), size);
370
            break;
371
        case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
372
            offset = get_be32(pb);      /* Offset of sound data */
373
            get_be32(pb);               /* BlockSize... don't care */
374
            offset += url_ftell(pb);    /* Compute absolute data offset */
375
            if (st->codec->block_align)    /* Assume COMM already parsed */
376
                goto got_sound;
377
            if (url_is_streamed(pb)) {
378
                av_log(s, AV_LOG_ERROR, "file is not seekable\n");
379
                return -1;
380
            }
381
            url_fskip(pb, size - 8);
382
            break;
383
        case MKTAG('w', 'a', 'v', 'e'):
384
            if ((uint64_t)size > (1<<30))
385
                return -1;
386
            st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
387
            if (!st->codec->extradata)
388
                return AVERROR(ENOMEM);
389
            st->codec->extradata_size = size;
390
            get_buffer(pb, st->codec->extradata, size);
391
            break;
392
        default: /* Jump */
393
            if (size & 1)   /* Always even aligned */
394
                size++;
395
            url_fskip (pb, size);
396
        }
397
    }
398

    
399
    if (!st->codec->block_align) {
400
        av_log(s, AV_LOG_ERROR, "could not find COMM tag\n");
401
        return -1;
402
    }
403

    
404
got_sound:
405
    /* Now positioned, get the sound data start and end */
406
    if (st->nb_frames)
407
        s->file_size = st->nb_frames * st->codec->block_align;
408

    
409
    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
410
    st->start_time = 0;
411
    st->duration = st->codec->frame_size ?
412
        st->nb_frames * st->codec->frame_size : st->nb_frames;
413

    
414
    /* Position the stream at the first block */
415
    url_fseek(pb, offset, SEEK_SET);
416

    
417
    return 0;
418
}
419

    
420
#define MAX_SIZE 4096
421

    
422
static int aiff_read_packet(AVFormatContext *s,
423
                            AVPacket *pkt)
424
{
425
    AVStream *st = s->streams[0];
426
    int res;
427

    
428
    /* End of stream may be reached */
429
    if (url_feof(s->pb))
430
        return AVERROR(EIO);
431

    
432
    /* Now for that packet */
433
    res = av_get_packet(s->pb, pkt, (MAX_SIZE / st->codec->block_align) * st->codec->block_align);
434
    if (res < 0)
435
        return res;
436

    
437
    /* Only one stream in an AIFF file */
438
    pkt->stream_index = 0;
439
    return 0;
440
}
441

    
442
#ifdef CONFIG_AIFF_DEMUXER
443
AVInputFormat aiff_demuxer = {
444
    "aiff",
445
    NULL_IF_CONFIG_SMALL("Audio IFF"),
446
    0,
447
    aiff_probe,
448
    aiff_read_header,
449
    aiff_read_packet,
450
    NULL,
451
    pcm_read_seek,
452
    .codec_tag= (const AVCodecTag* const []){codec_aiff_tags, 0},
453
};
454
#endif
455

    
456
#ifdef CONFIG_AIFF_MUXER
457
AVOutputFormat aiff_muxer = {
458
    "aiff",
459
    NULL_IF_CONFIG_SMALL("Audio IFF"),
460
    "audio/aiff",
461
    "aif,aiff,afc,aifc",
462
    sizeof(AIFFOutputContext),
463
    CODEC_ID_PCM_S16BE,
464
    CODEC_ID_NONE,
465
    aiff_write_header,
466
    aiff_write_packet,
467
    aiff_write_trailer,
468
    .codec_tag= (const AVCodecTag* const []){codec_aiff_tags, 0},
469
};
470
#endif