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ffmpeg / libavformat / aiff.c @ 71e445fc

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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 "avformat.h"
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#include "allformats.h"
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#include "riff.h"
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#include "intfloat_readwrite.h"
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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_ALAW, MKTAG('a','l','a','w') },
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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_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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    { 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 int 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 0;
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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_IO;
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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_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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        if (codec->codec_id == CODEC_ID_PCM_S16BE) {
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            codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
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            codec->bits_per_sample = av_get_bits_per_sample(codec->codec_id);
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        }
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        size -= 4;
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    } else {
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        /* Need the codec type */
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        codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
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        codec->bits_per_sample = av_get_bits_per_sample(codec->codec_id);
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    }
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    if (!codec->codec_id)
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        return AVERROR_INVALIDDATA;
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    /* 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 */
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    codec->block_align = (codec->bits_per_sample * codec->channels) >> 3;
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    codec->bit_rate = codec->sample_rate * (codec->block_align << 3);
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    /* Chunk is over */
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    if (size)
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        url_fseek(pb, size, SEEK_CUR);
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    return num_frames;
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}
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#ifdef CONFIG_MUXERS
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typedef struct {
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    offset_t form;
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    offset_t frames;
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    offset_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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    /* First verify if format is ok */
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    if (!enc->codec_tag) {
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        return -1;
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    }
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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");
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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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    /* Common chunk */
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    put_tag(pb, "COMM");
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    put_be32(pb, 24); /* 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_sample)
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        enc->bits_per_sample = av_get_bits_per_sample(enc->codec_id);
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    if (!enc->bits_per_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_sample * enc->channels) >> 3;
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    put_be16(pb, enc->bits_per_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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    put_le32(pb, enc->codec_tag);
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    put_be16(pb, 0);
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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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    offset_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, (uint32_t)(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, ((uint32_t)(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, (uint32_t)(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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#endif //CONFIG_MUXERS
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static int aiff_probe(AVProbeData *p)
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{
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    /* check file header */
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    if (p->buf_size < 16)
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        return 0;
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    if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
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        p->buf[2] == 'R' && p->buf[3] == 'M' &&
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        p->buf[8] == 'A' && p->buf[9] == 'I' &&
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        p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
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        return AVPROBE_SCORE_MAX;
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    else
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        return 0;
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}
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/* aiff input */
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static int aiff_read_header(AVFormatContext *s,
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                            AVFormatParameters *ap)
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{
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    int size, filesize, offset;
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    uint32_t tag;
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    unsigned version = AIFF_C_VERSION1;
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    ByteIOContext *pb = &s->pb;
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    AVStream * st = s->streams[0];
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    /* check FORM header */
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    filesize = get_tag(pb, &tag);
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    if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
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        return AVERROR_INVALIDDATA;
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    /* AIFF data type */
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    tag = get_le32(pb);
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    if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
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        version = AIFF;
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    else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
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        return AVERROR_INVALIDDATA;
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    filesize -= 4;
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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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    while (filesize > 0) {
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        /* parse different chunks */
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        size = get_tag(pb, &tag);
312
        if (size < 0)
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            return size;
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        filesize -= size + 8;
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        switch (tag) {
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            case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
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                /* Then for the complete header info */
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                st->nb_frames = get_aiff_header (pb, st->codec, size, version);
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                if (st->nb_frames < 0)
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                        return st->nb_frames;
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                break;
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            case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
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                version = get_be32(pb);
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                break;
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329
            case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
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                get_meta (pb, s->title, sizeof(s->title), size);
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                break;
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333
            case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
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                get_meta (pb, s->author, sizeof(s->author), size);
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                break;
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            case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
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                get_meta (pb, s->copyright, sizeof(s->copyright), size);
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                break;
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341
            case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
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                get_meta (pb, s->comment, sizeof(s->comment), size);
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                break;
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345
            case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
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                get_be32(pb);               /* Block align... don't care */
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                offset = get_be32(pb);      /* Offset of sound data */
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                goto got_sound;
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350
            default: /* Jump */
351
                if (size & 1)   /* Always even aligned */
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                    size++;
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                url_fskip (pb, size);
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        }
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    }
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357
    /* End of loop and didn't get sound */
358
    return AVERROR_INVALIDDATA;
359

    
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got_sound:
361
    /* Now positioned, get the sound data start and end */
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    if (st->nb_frames)
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        s->file_size = st->nb_frames * st->codec->block_align;
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    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
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    st->start_time = 0;
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    st->duration = st->nb_frames;
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    /* Position the stream at the first block */
370
    url_fskip(pb, offset);
371

    
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    return 0;
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}
374

    
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#define MAX_SIZE 4096
376

    
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static int aiff_read_packet(AVFormatContext *s,
378
                            AVPacket *pkt)
379
{
380
    AVStream *st = s->streams[0];
381
    int res;
382

    
383
    /* End of stream may be reached */
384
    if (url_feof(&s->pb))
385
        return AVERROR_IO;
386

    
387
    /* Now for that packet */
388
    res = av_get_packet(&s->pb, pkt, (MAX_SIZE / st->codec->block_align) * st->codec->block_align);
389
    if (res < 0)
390
        return res;
391

    
392
    /* Only one stream in an AIFF file */
393
    pkt->stream_index = 0;
394
    return 0;
395
}
396

    
397
static int aiff_read_close(AVFormatContext *s)
398
{
399
    return 0;
400
}
401

    
402
static int aiff_read_seek(AVFormatContext *s,
403
                          int stream_index, int64_t timestamp, int flags)
404
{
405
    return pcm_read_seek(s, stream_index, timestamp, flags);
406
}
407

    
408
#ifdef CONFIG_AIFF_DEMUXER
409
AVInputFormat aiff_demuxer = {
410
    "aiff",
411
    "Audio IFF",
412
    0,
413
    aiff_probe,
414
    aiff_read_header,
415
    aiff_read_packet,
416
    aiff_read_close,
417
    aiff_read_seek,
418
    .codec_tag= (const AVCodecTag*[]){codec_aiff_tags, 0},
419
};
420
#endif
421

    
422
#ifdef CONFIG_AIFF_MUXER
423
AVOutputFormat aiff_muxer = {
424
    "aiff",
425
    "Audio IFF",
426
    "audio/aiff",
427
    "aif,aiff,afc,aifc",
428
    sizeof(AIFFOutputContext),
429
    CODEC_ID_PCM_S16BE,
430
    CODEC_ID_NONE,
431
    aiff_write_header,
432
    aiff_write_packet,
433
    aiff_write_trailer,
434
    .codec_tag= (const AVCodecTag*[]){codec_aiff_tags, 0},
435
};
436
#endif