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313 lines
8.0 KiB
313 lines
8.0 KiB
/* |
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* WAV encoder and decoder |
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* Copyright (c) 2001 Fabrice Bellard. |
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "avformat.h" |
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#include "avi.h" |
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CodecTag codec_wav_tags[] = { |
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{ CODEC_ID_MP2, 0x50 }, |
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{ CODEC_ID_MP3LAME, 0x55 }, |
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{ CODEC_ID_AC3, 0x2000 }, |
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{ CODEC_ID_PCM_S16LE, 0x01 }, |
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{ CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */ |
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{ CODEC_ID_PCM_ALAW, 0x06 }, |
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{ CODEC_ID_PCM_MULAW, 0x07 }, |
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{ 0, 0 }, |
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}; |
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/* WAVEFORMATEX header */ |
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/* returns the size or -1 on error */ |
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int put_wav_header(ByteIOContext *pb, AVCodecContext *enc) |
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{ |
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int tag, bps, blkalign, bytespersec; |
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int hdrsize = 18; |
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tag = codec_get_tag(codec_wav_tags, enc->codec_id); |
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if (tag == 0) |
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return -1; |
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put_le16(pb, tag); |
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put_le16(pb, enc->channels); |
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put_le32(pb, enc->sample_rate); |
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if (enc->codec_id == CODEC_ID_PCM_U8 || |
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enc->codec_id == CODEC_ID_PCM_ALAW || |
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enc->codec_id == CODEC_ID_PCM_MULAW) { |
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bps = 8; |
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} else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) { |
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bps = 0; |
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} else { |
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bps = 16; |
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} |
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if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) { |
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blkalign = 1; |
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//blkalign = 144 * enc->bit_rate/enc->sample_rate; |
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} else |
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blkalign = enc->channels*bps >> 3; |
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if (enc->codec_id == CODEC_ID_PCM_U8 || |
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enc->codec_id == CODEC_ID_PCM_S16LE) { |
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bytespersec = enc->sample_rate * blkalign; |
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} else { |
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bytespersec = enc->bit_rate / 8; |
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} |
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put_le32(pb, bytespersec); /* bytes per second */ |
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put_le16(pb, blkalign); /* block align */ |
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put_le16(pb, bps); /* bits per sample */ |
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if (enc->codec_id == CODEC_ID_MP3LAME) { |
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put_le16(pb, 12); /* wav_extra_size */ |
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hdrsize += 12; |
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put_le16(pb, 1); /* wID */ |
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put_le32(pb, 2); /* fdwFlags */ |
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put_le16(pb, 1152); /* nBlockSize */ |
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put_le16(pb, 1); /* nFramesPerBlock */ |
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put_le16(pb, 1393); /* nCodecDelay */ |
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} else if (enc->codec_id == CODEC_ID_MP2) { |
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put_le16(pb, 22); /* wav_extra_size */ |
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hdrsize += 22; |
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put_le16(pb, 2); /* fwHeadLayer */ |
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put_le32(pb, enc->bit_rate); /* dwHeadBitrate */ |
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put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */ |
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put_le16(pb, 0); /* fwHeadModeExt */ |
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put_le16(pb, 1); /* wHeadEmphasis */ |
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put_le16(pb, 16); /* fwHeadFlags */ |
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put_le32(pb, 0); /* dwPTSLow */ |
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put_le32(pb, 0); /* dwPTSHigh */ |
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} else |
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put_le16(pb, 0); /* wav_extra_size */ |
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return hdrsize; |
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} |
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int wav_codec_get_id(unsigned int tag, int bps) |
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{ |
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int id; |
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id = codec_get_id(codec_wav_tags, tag); |
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if (id <= 0) |
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return id; |
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/* handle specific u8 codec */ |
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if (id == CODEC_ID_PCM_S16LE && bps == 8) |
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id = CODEC_ID_PCM_U8; |
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return id; |
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} |
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typedef struct { |
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offset_t data; |
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} WAVContext; |
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static int wav_write_header(AVFormatContext *s) |
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{ |
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WAVContext *wav = s->priv_data; |
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ByteIOContext *pb = &s->pb; |
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offset_t fmt; |
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put_tag(pb, "RIFF"); |
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put_le32(pb, 0); /* file length */ |
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put_tag(pb, "WAVE"); |
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/* format header */ |
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fmt = start_tag(pb, "fmt "); |
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if (put_wav_header(pb, &s->streams[0]->codec) < 0) { |
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av_free(wav); |
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return -1; |
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} |
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end_tag(pb, fmt); |
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/* data header */ |
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wav->data = start_tag(pb, "data"); |
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put_flush_packet(pb); |
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return 0; |
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} |
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static int wav_write_packet(AVFormatContext *s, int stream_index_ptr, |
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UINT8 *buf, int size, int force_pts) |
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{ |
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ByteIOContext *pb = &s->pb; |
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put_buffer(pb, buf, size); |
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return 0; |
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} |
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static int wav_write_trailer(AVFormatContext *s) |
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{ |
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ByteIOContext *pb = &s->pb; |
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WAVContext *wav = s->priv_data; |
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offset_t file_size; |
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if (!url_is_streamed(&s->pb)) { |
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end_tag(pb, wav->data); |
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/* update file size */ |
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file_size = url_ftell(pb); |
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url_fseek(pb, 4, SEEK_SET); |
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put_le32(pb, (UINT32)(file_size - 8)); |
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url_fseek(pb, file_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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/* return the size of the found tag */ |
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/* XXX: > 2GB ? */ |
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static int find_tag(ByteIOContext *pb, UINT32 tag1) |
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{ |
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unsigned int tag; |
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int size; |
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for(;;) { |
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if (url_feof(pb)) |
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return -1; |
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tag = get_le32(pb); |
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size = get_le32(pb); |
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if (tag == tag1) |
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break; |
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url_fseek(pb, size, SEEK_CUR); |
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} |
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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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static int wav_probe(AVProbeData *p) |
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{ |
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/* check file header */ |
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if (p->buf_size <= 32) |
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return 0; |
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if (p->buf[0] == 'R' && p->buf[1] == 'I' && |
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p->buf[2] == 'F' && p->buf[3] == 'F' && |
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p->buf[8] == 'W' && p->buf[9] == 'A' && |
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p->buf[10] == 'V' && p->buf[11] == 'E') |
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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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/* wav input */ |
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static int wav_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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int size; |
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unsigned int tag; |
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ByteIOContext *pb = &s->pb; |
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unsigned int id, channels, rate, bit_rate, extra_size, bps; |
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AVStream *st; |
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/* check RIFF header */ |
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tag = get_le32(pb); |
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if (tag != MKTAG('R', 'I', 'F', 'F')) |
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return -1; |
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get_le32(pb); /* file size */ |
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tag = get_le32(pb); |
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if (tag != MKTAG('W', 'A', 'V', 'E')) |
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return -1; |
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/* parse fmt header */ |
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size = find_tag(pb, MKTAG('f', 'm', 't', ' ')); |
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if (size < 0) |
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return -1; |
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id = get_le16(pb); |
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channels = get_le16(pb); |
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rate = get_le32(pb); |
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bit_rate = get_le32(pb) * 8; |
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get_le16(pb); /* block align */ |
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bps = get_le16(pb); /* bits per sample */ |
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if (size >= 18) { |
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/* wav_extra_size */ |
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extra_size = get_le16(pb); |
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/* skip unused data */ |
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url_fseek(pb, size - 18, SEEK_CUR); |
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} |
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size = find_tag(pb, MKTAG('d', 'a', 't', 'a')); |
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if (size < 0) |
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return -1; |
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/* now we are ready: build format streams */ |
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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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st->codec.codec_type = CODEC_TYPE_AUDIO; |
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st->codec.codec_tag = id; |
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st->codec.codec_id = wav_codec_get_id(id, bps); |
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st->codec.channels = channels; |
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st->codec.sample_rate = rate; |
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return 0; |
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} |
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#define MAX_SIZE 4096 |
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static int wav_read_packet(AVFormatContext *s, |
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AVPacket *pkt) |
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{ |
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int packet_size, n, ret; |
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if (url_feof(&s->pb)) |
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return -EIO; |
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packet_size = url_get_packet_size(&s->pb); |
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n = MAX_SIZE / packet_size; |
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if (n <= 0) |
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return n = 1; |
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if (av_new_packet(pkt, n * packet_size)) |
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return -EIO; |
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pkt->stream_index = 0; |
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ret = get_buffer(&s->pb, pkt->data, pkt->size); |
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if (ret < 0) |
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av_free_packet(pkt); |
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/* note: we need to modify the packet size here to handle the last |
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packet */ |
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pkt->size = ret; |
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return ret; |
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} |
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static int wav_read_close(AVFormatContext *s) |
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{ |
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return 0; |
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} |
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static AVInputFormat wav_iformat = { |
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"wav", |
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"wav format", |
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0, |
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wav_probe, |
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wav_read_header, |
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wav_read_packet, |
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wav_read_close, |
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}; |
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static AVOutputFormat wav_oformat = { |
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"wav", |
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"wav format", |
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"audio/x-wav", |
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"wav", |
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sizeof(WAVContext), |
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CODEC_ID_PCM_S16LE, |
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CODEC_ID_NONE, |
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wav_write_header, |
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wav_write_packet, |
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wav_write_trailer, |
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}; |
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int wav_init(void) |
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{ |
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av_register_input_format(&wav_iformat); |
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av_register_output_format(&wav_oformat); |
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return 0; |
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}
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