renamed libav to libavformat

Originally committed as revision 1276 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 326 insertions, 0 deletions

diff --git a/libavformat/wav.c b/libavformat/wav.c
new file mode 100644
index 0000000000..f6bcd7b0e5
--- /dev/null
+++ b/libavformat/wav.c
@@ -0,0 +1,326 @@
+/* 
+ * 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_MP3LAME, 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_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 tag, bps, blkalign, bytespersec;
+    int hdrsize = 18;
+
+    tag = codec_get_tag(codec_wav_tags, enc->codec_id);
+    if (tag == 0)
+        return -1;
+    put_le16(pb, 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_MP3LAME) {
+        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_MP3LAME) {
+        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_MP3LAME) {
+        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;
+}
+
+void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, 
+                    int has_extra_data)
+{
+    int id;
+
+    id = get_le16(pb);
+    codec->codec_type = CODEC_TYPE_AUDIO;
+    codec->codec_tag = id;
+    codec->fourcc = 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);
+    codec->frame_bits = get_le16(pb); /* bits per sample */
+    codec->codec_id = wav_codec_get_id(id, codec->frame_bits);
+    if (has_extra_data) {
+	codec->extradata_size = get_le16(pb);
+	if (codec->extradata_size > 0) {
+            codec->extradata = av_mallocz(codec->extradata_size);
+            get_buffer(pb, codec->extradata, codec->extradata_size);
+        }
+    }
+}
+
+
+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,
+                           UINT8 *buf, int size, int force_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)(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 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 >= 18));
+    
+    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;
+}