Rename aiff.c to aiffdec.c

Originally committed as revision 20235 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 315 insertions, 0 deletions

diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c
new file mode 100644
index 0000000000..6cc91d4c19
--- /dev/null
+++ b/libavformat/aiffdec.c
@@ -0,0 +1,315 @@
+/*
+ * AIFF/AIFF-C demuxer
+ * Copyright (c) 2006  Patrick Guimond
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/intfloat_readwrite.h"
+#include "avformat.h"
+#include "raw.h"
+#include "aiff.h"
+
+#define AIFF                    0
+#define AIFF_C_VERSION1         0xA2805140
+
+typedef struct {
+    int64_t data_end;
+} AIFFInputContext;
+
+static enum CodecID aiff_codec_get_id(int bps)
+{
+    if (bps <= 8)
+        return CODEC_ID_PCM_S8;
+    if (bps <= 16)
+        return CODEC_ID_PCM_S16BE;
+    if (bps <= 24)
+        return CODEC_ID_PCM_S24BE;
+    if (bps <= 32)
+        return CODEC_ID_PCM_S32BE;
+
+    /* bigger than 32 isn't allowed  */
+    return CODEC_ID_NONE;
+}
+
+/* returns the size of the found tag */
+static int get_tag(ByteIOContext *pb, uint32_t * tag)
+{
+    int size;
+
+    if (url_feof(pb))
+        return AVERROR(EIO);
+
+    *tag = get_le32(pb);
+    size = get_be32(pb);
+
+    if (size < 0)
+        size = 0x7fffffff;
+
+    return size;
+}
+
+/* Metadata string read */
+static void get_meta(AVFormatContext *s, const char *key, int size)
+{
+    uint8_t str[1024];
+    int res = get_buffer(s->pb, str, FFMIN(sizeof(str)-1, size));
+    if (res < 0)
+        return;
+
+    str[res] = 0;
+    if (size & 1)
+        size++;
+    size -= res;
+    if (size)
+        url_fskip(s->pb, size);
+
+    av_metadata_set(&s->metadata, key, str);
+}
+
+/* Returns the number of sound data frames or negative on error */
+static unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec,
+                             int size, unsigned version)
+{
+    AVExtFloat ext;
+    double sample_rate;
+    unsigned int num_frames;
+
+    if (size & 1)
+        size++;
+    codec->codec_type = CODEC_TYPE_AUDIO;
+    codec->channels = get_be16(pb);
+    num_frames = get_be32(pb);
+    codec->bits_per_coded_sample = get_be16(pb);
+
+    get_buffer(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
+    sample_rate = av_ext2dbl(ext);          /* 80 bits BE IEEE extended float */
+    codec->sample_rate = sample_rate;
+    size -= 18;
+
+    /* Got an AIFF-C? */
+    if (version == AIFF_C_VERSION1) {
+        codec->codec_tag = get_le32(pb);
+        codec->codec_id  = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
+
+        switch (codec->codec_id) {
+        case CODEC_ID_PCM_S16BE:
+            codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
+            codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
+            break;
+        case CODEC_ID_ADPCM_IMA_QT:
+            codec->block_align = 34*codec->channels;
+            codec->frame_size = 64;
+            break;
+        case CODEC_ID_MACE3:
+            codec->block_align = 2*codec->channels;
+            codec->frame_size = 6;
+            break;
+        case CODEC_ID_MACE6:
+            codec->block_align = 1*codec->channels;
+            codec->frame_size = 6;
+            break;
+        case CODEC_ID_GSM:
+            codec->block_align = 33;
+            codec->frame_size = 160;
+            break;
+        default:
+            break;
+        }
+        size -= 4;
+    } else {
+        /* Need the codec type */
+        codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
+        codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
+    }
+
+    /* Block align needs to be computed in all cases, as the definition
+     * is specific to applications -> here we use the WAVE format definition */
+    if (!codec->block_align)
+        codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
+
+    codec->bit_rate = (codec->frame_size ? codec->sample_rate/codec->frame_size :
+                       codec->sample_rate) * (codec->block_align << 3);
+
+    /* Chunk is over */
+    if (size)
+        url_fseek(pb, size, SEEK_CUR);
+
+    return num_frames;
+}
+
+static int aiff_probe(AVProbeData *p)
+{
+    /* check file header */
+    if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
+        p->buf[2] == 'R' && p->buf[3] == 'M' &&
+        p->buf[8] == 'A' && p->buf[9] == 'I' &&
+        p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+/* aiff input */
+static int aiff_read_header(AVFormatContext *s,
+                            AVFormatParameters *ap)
+{
+    int size, filesize;
+    int64_t offset = 0;
+    uint32_t tag;
+    unsigned version = AIFF_C_VERSION1;
+    ByteIOContext *pb = s->pb;
+    AVStream * st;
+    AIFFInputContext *aiff = s->priv_data;
+
+    /* check FORM header */
+    filesize = get_tag(pb, &tag);
+    if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
+        return AVERROR_INVALIDDATA;
+
+    /* AIFF data type */
+    tag = get_le32(pb);
+    if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
+        version = AIFF;
+    else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
+        return AVERROR_INVALIDDATA;
+
+    filesize -= 4;
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    while (filesize > 0) {
+        /* parse different chunks */
+        size = get_tag(pb, &tag);
+        if (size < 0)
+            return size;
+
+        filesize -= size + 8;
+
+        switch (tag) {
+        case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
+            /* Then for the complete header info */
+            st->nb_frames = get_aiff_header(pb, st->codec, size, version);
+            if (st->nb_frames < 0)
+                return st->nb_frames;
+            if (offset > 0) // COMM is after SSND
+                goto got_sound;
+            break;
+        case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
+            version = get_be32(pb);
+            break;
+        case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
+            get_meta(s, "title"    , size);
+            break;
+        case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
+            get_meta(s, "author"   , size);
+            break;
+        case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
+            get_meta(s, "copyright", size);
+            break;
+        case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
+            get_meta(s, "comment"  , size);
+            break;
+        case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
+            aiff->data_end = url_ftell(pb) + size;
+            offset = get_be32(pb);      /* Offset of sound data */
+            get_be32(pb);               /* BlockSize... don't care */
+            offset += url_ftell(pb);    /* Compute absolute data offset */
+            if (st->codec->block_align)    /* Assume COMM already parsed */
+                goto got_sound;
+            if (url_is_streamed(pb)) {
+                av_log(s, AV_LOG_ERROR, "file is not seekable\n");
+                return -1;
+            }
+            url_fskip(pb, size - 8);
+            break;
+        case MKTAG('w', 'a', 'v', 'e'):
+            if ((uint64_t)size > (1<<30))
+                return -1;
+            st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
+            if (!st->codec->extradata)
+                return AVERROR(ENOMEM);
+            st->codec->extradata_size = size;
+            get_buffer(pb, st->codec->extradata, size);
+            break;
+        default: /* Jump */
+            if (size & 1)   /* Always even aligned */
+                size++;
+            url_fskip (pb, size);
+        }
+    }
+
+    if (!st->codec->block_align) {
+        av_log(s, AV_LOG_ERROR, "could not find COMM tag\n");
+        return -1;
+    }
+
+got_sound:
+    /* Now positioned, get the sound data start and end */
+    if (st->nb_frames)
+        s->file_size = st->nb_frames * st->codec->block_align;
+
+    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
+    st->start_time = 0;
+    st->duration = st->codec->frame_size ?
+        st->nb_frames * st->codec->frame_size : st->nb_frames;
+
+    /* Position the stream at the first block */
+    url_fseek(pb, offset, SEEK_SET);
+
+    return 0;
+}
+
+#define MAX_SIZE 4096
+
+static int aiff_read_packet(AVFormatContext *s,
+                            AVPacket *pkt)
+{
+    AVStream *st = s->streams[0];
+    AIFFInputContext *aiff = s->priv_data;
+    int64_t max_size;
+    int res;
+
+    /* calculate size of remaining data */
+    max_size = aiff->data_end - url_ftell(s->pb);
+    if (max_size <= 0)
+        return AVERROR_EOF;
+
+    /* Now for that packet */
+    max_size = FFMIN(max_size, (MAX_SIZE / st->codec->block_align) * st->codec->block_align);
+    res = av_get_packet(s->pb, pkt, max_size);
+    if (res < 0)
+        return res;
+
+    /* Only one stream in an AIFF file */
+    pkt->stream_index = 0;
+    return 0;
+}
+
+AVInputFormat aiff_demuxer = {
+    "aiff",
+    NULL_IF_CONFIG_SMALL("Audio IFF"),
+    sizeof(AIFFInputContext),
+    aiff_probe,
+    aiff_read_header,
+    aiff_read_packet,
+    NULL,
+    pcm_read_seek,
+    .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0},
+};