458 lines
12 KiB
C
458 lines
12 KiB
C
/*
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* AIFF/AIFF-C encoder and decoder
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* Copyright (c) 2006 Patrick Guimond
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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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const CodecTag 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 bits per second */
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static int fix_bps(int codec_id)
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{
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switch (codec_id) {
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case CODEC_ID_PCM_S8:
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return 8;
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case CODEC_ID_PCM_S16BE:
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return 16;
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case CODEC_ID_PCM_S24BE:
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return 24;
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case CODEC_ID_PCM_S32BE:
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return 32;
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}
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return -1;
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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 = fix_bps(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 = fix_bps(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;
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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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int coder_len;
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/* First verify if format is ok */
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enc->codec_tag = codec_get_tag(codec_aiff_tags, enc->codec_id);
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if (!enc->codec_tag) {
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av_free(aiff);
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return -1;
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}
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coder_len = strlen(enc->codec->name);
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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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if (coder_len & 1) /* Common chunk is of var size */
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put_be32(pb, 23+coder_len);
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else
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put_be32(pb, 24+coder_len);
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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 = (enc->block_align<<3) / enc->channels;
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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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if (coder_len & 1) {
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put_byte(pb, coder_len);
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put_buffer(pb, (const uint8_t*)enc->codec->name, coder_len);
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} else {
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put_byte(pb, coder_len+1);
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put_buffer(pb, (const uint8_t*)enc->codec->name, coder_len);
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put_byte(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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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);
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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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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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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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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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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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default: /* Jump */
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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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/* End of loop and didn't get sound */
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return AVERROR_INVALIDDATA;
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got_sound:
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/* 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 */
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url_fskip(pb, offset);
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return 0;
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}
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#define MAX_SIZE 4096
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static int aiff_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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AVStream *st = s->streams[0];
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int res;
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/* End of stream may be reached */
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if (url_feof(&s->pb))
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return AVERROR_IO;
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/* Now for that packet */
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res = av_get_packet(&s->pb, pkt, (MAX_SIZE / st->codec->block_align) * st->codec->block_align);
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if (res < 0)
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return res;
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/* Only one stream in an AIFF file */
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pkt->stream_index = 0;
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return 0;
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}
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static int aiff_read_close(AVFormatContext *s)
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{
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return 0;
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}
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static int aiff_read_seek(AVFormatContext *s,
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int stream_index, int64_t timestamp, int flags)
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{
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return pcm_read_seek(s, stream_index, timestamp, flags);
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}
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#ifdef CONFIG_AIFF_DEMUXER
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AVInputFormat aiff_demuxer = {
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"aiff",
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"Audio IFF",
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0,
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aiff_probe,
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aiff_read_header,
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aiff_read_packet,
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aiff_read_close,
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aiff_read_seek,
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};
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#endif
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#ifdef CONFIG_AIFF_MUXER
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AVOutputFormat aiff_muxer = {
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"aiff",
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"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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};
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#endif
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