--- /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