+++ /dev/null
-/*
- * WAV encoder and decoder
- * Copyright (c) 2001, 2002 Fabrice Bellard.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-#include "avformat.h"
-#include "avi.h"
-
-const CodecTag codec_wav_tags[] = {
- { CODEC_ID_MP2, 0x50 },
- { CODEC_ID_MP3, 0x55 },
- { CODEC_ID_AC3, 0x2000 },
- { CODEC_ID_PCM_S16LE, 0x01 },
- { CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */
- { CODEC_ID_PCM_ALAW, 0x06 },
- { CODEC_ID_PCM_MULAW, 0x07 },
- { CODEC_ID_ADPCM_MS, 0x02 },
- { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
- { CODEC_ID_ADPCM_IMA_DK4, 0x61 }, /* rogue format number */
- { CODEC_ID_ADPCM_IMA_DK3, 0x62 }, /* rogue format number */
- { CODEC_ID_WMAV1, 0x160 },
- { CODEC_ID_WMAV2, 0x161 },
- { 0, 0 },
-};
-
-/* WAVEFORMATEX header */
-/* returns the size or -1 on error */
-int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
-{
- int bps, blkalign, bytespersec;
- int hdrsize = 18;
-
- if(!enc->codec_tag)
- enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
- if(!enc->codec_tag)
- return -1;
-
- put_le16(pb, enc->codec_tag);
- put_le16(pb, enc->channels);
- put_le32(pb, enc->sample_rate);
- if (enc->codec_id == CODEC_ID_PCM_U8 ||
- enc->codec_id == CODEC_ID_PCM_ALAW ||
- enc->codec_id == CODEC_ID_PCM_MULAW) {
- bps = 8;
- } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
- bps = 0;
- } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS) {
- bps = 4;
- } else {
- bps = 16;
- }
-
- if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
- blkalign = 1;
- //blkalign = 144 * enc->bit_rate/enc->sample_rate;
- } else if (enc->block_align != 0) { /* specified by the codec */
- blkalign = enc->block_align;
- } else
- blkalign = enc->channels*bps >> 3;
- if (enc->codec_id == CODEC_ID_PCM_U8 ||
- enc->codec_id == CODEC_ID_PCM_S16LE) {
- bytespersec = enc->sample_rate * blkalign;
- } else {
- bytespersec = enc->bit_rate / 8;
- }
- put_le32(pb, bytespersec); /* bytes per second */
- put_le16(pb, blkalign); /* block align */
- put_le16(pb, bps); /* bits per sample */
- if (enc->codec_id == CODEC_ID_MP3) {
- put_le16(pb, 12); /* wav_extra_size */
- hdrsize += 12;
- put_le16(pb, 1); /* wID */
- put_le32(pb, 2); /* fdwFlags */
- put_le16(pb, 1152); /* nBlockSize */
- put_le16(pb, 1); /* nFramesPerBlock */
- put_le16(pb, 1393); /* nCodecDelay */
- } else if (enc->codec_id == CODEC_ID_MP2) {
- put_le16(pb, 22); /* wav_extra_size */
- hdrsize += 22;
- put_le16(pb, 2); /* fwHeadLayer */
- put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
- put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
- put_le16(pb, 0); /* fwHeadModeExt */
- put_le16(pb, 1); /* wHeadEmphasis */
- put_le16(pb, 16); /* fwHeadFlags */
- put_le32(pb, 0); /* dwPTSLow */
- put_le32(pb, 0); /* dwPTSHigh */
- } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
- put_le16(pb, 2); /* wav_extra_size */
- put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
- } else
- put_le16(pb, 0); /* wav_extra_size */
-
- return hdrsize;
-}
-
-/* We could be given one of the three possible structures here:
- * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
- * is an expansion of the previous one with the fields added
- * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
- * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
- * an openended structure.
- */
-void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
-{
- int id;
-
- id = get_le16(pb);
- codec->codec_type = CODEC_TYPE_AUDIO;
- codec->codec_tag = id;
- codec->channels = get_le16(pb);
- codec->sample_rate = get_le32(pb);
- codec->bit_rate = get_le32(pb) * 8;
- codec->block_align = get_le16(pb);
- if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
- codec->bits_per_sample = 8;
- }else
- codec->bits_per_sample = get_le16(pb);
- codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
-
- if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
- codec->extradata_size = get_le16(pb);
- if (codec->extradata_size > 0) {
- if (codec->extradata_size > size - 18)
- codec->extradata_size = size - 18;
- codec->extradata = av_mallocz(codec->extradata_size);
- get_buffer(pb, codec->extradata, codec->extradata_size);
- } else
- codec->extradata_size = 0;
-
- /* It is possible for the chunk to contain garbage at the end */
- if (size - codec->extradata_size - 18 > 0)
- url_fskip(pb, size - codec->extradata_size - 18);
- }
-}
-
-
-int wav_codec_get_id(unsigned int tag, int bps)
-{
- int id;
- id = codec_get_id(codec_wav_tags, tag);
- if (id <= 0)
- return id;
- /* handle specific u8 codec */
- if (id == CODEC_ID_PCM_S16LE && bps == 8)
- id = CODEC_ID_PCM_U8;
- return id;
-}
-
-typedef struct {
- offset_t data;
-} WAVContext;
-
-static int wav_write_header(AVFormatContext *s)
-{
- WAVContext *wav = s->priv_data;
- ByteIOContext *pb = &s->pb;
- offset_t fmt;
-
- put_tag(pb, "RIFF");
- put_le32(pb, 0); /* file length */
- put_tag(pb, "WAVE");
-
- /* format header */
- fmt = start_tag(pb, "fmt ");
- if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
- av_free(wav);
- return -1;
- }
- end_tag(pb, fmt);
-
- /* data header */
- wav->data = start_tag(pb, "data");
-
- put_flush_packet(pb);
-
- return 0;
-}
-
-static int wav_write_packet(AVFormatContext *s, int stream_index_ptr,
- const uint8_t *buf, int size, int64_t pts)
-{
- ByteIOContext *pb = &s->pb;
- put_buffer(pb, buf, size);
- return 0;
-}
-
-static int wav_write_trailer(AVFormatContext *s)
-{
- ByteIOContext *pb = &s->pb;
- WAVContext *wav = s->priv_data;
- offset_t file_size;
-
- if (!url_is_streamed(&s->pb)) {
- end_tag(pb, wav->data);
-
- /* update file size */
- file_size = url_ftell(pb);
- url_fseek(pb, 4, SEEK_SET);
- put_le32(pb, (uint32_t)(file_size - 8));
- url_fseek(pb, file_size, SEEK_SET);
-
- put_flush_packet(pb);
- }
- return 0;
-}
-
-/* return the size of the found tag */
-/* XXX: > 2GB ? */
-static int find_tag(ByteIOContext *pb, uint32_t tag1)
-{
- unsigned int tag;
- int size;
-
- for(;;) {
- if (url_feof(pb))
- return -1;
- tag = get_le32(pb);
- size = get_le32(pb);
- if (tag == tag1)
- break;
- url_fseek(pb, size, SEEK_CUR);
- }
- if (size < 0)
- size = 0x7fffffff;
- return size;
-}
-
-static int wav_probe(AVProbeData *p)
-{
- /* check file header */
- if (p->buf_size <= 32)
- return 0;
- if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
- p->buf[2] == 'F' && p->buf[3] == 'F' &&
- p->buf[8] == 'W' && p->buf[9] == 'A' &&
- p->buf[10] == 'V' && p->buf[11] == 'E')
- return AVPROBE_SCORE_MAX;
- else
- return 0;
-}
-
-/* wav input */
-static int wav_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
-{
- int size;
- unsigned int tag;
- ByteIOContext *pb = &s->pb;
- AVStream *st;
-
- /* check RIFF header */
- tag = get_le32(pb);
-
- if (tag != MKTAG('R', 'I', 'F', 'F'))
- return -1;
- get_le32(pb); /* file size */
- tag = get_le32(pb);
- if (tag != MKTAG('W', 'A', 'V', 'E'))
- return -1;
-
- /* parse fmt header */
- size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
- if (size < 0)
- return -1;
- st = av_new_stream(s, 0);
- if (!st)
- return AVERROR_NOMEM;
-
- get_wav_header(pb, &st->codec, size);
-
- size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
- if (size < 0)
- return -1;
- return 0;
-}
-
-#define MAX_SIZE 4096
-
-static int wav_read_packet(AVFormatContext *s,
- AVPacket *pkt)
-{
- int ret;
-
- if (url_feof(&s->pb))
- return -EIO;
- if (av_new_packet(pkt, MAX_SIZE))
- return -EIO;
- pkt->stream_index = 0;
-
- ret = get_buffer(&s->pb, pkt->data, pkt->size);
- if (ret < 0)
- av_free_packet(pkt);
- /* note: we need to modify the packet size here to handle the last
- packet */
- pkt->size = ret;
- return ret;
-}
-
-static int wav_read_close(AVFormatContext *s)
-{
- return 0;
-}
-
-static AVInputFormat wav_iformat = {
- "wav",
- "wav format",
- 0,
- wav_probe,
- wav_read_header,
- wav_read_packet,
- wav_read_close,
-};
-
-static AVOutputFormat wav_oformat = {
- "wav",
- "wav format",
- "audio/x-wav",
- "wav",
- sizeof(WAVContext),
- CODEC_ID_PCM_S16LE,
- CODEC_ID_NONE,
- wav_write_header,
- wav_write_packet,
- wav_write_trailer,
-};
-
-int wav_init(void)
-{
- av_register_input_format(&wav_iformat);
- av_register_output_format(&wav_oformat);
- return 0;
-}
projects / synfig.git / blobdiff