Monkey Audio decoder

Originally committed as revision 10484 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 392 insertions, 0 deletions

diff --git a/libavformat/ape.c b/libavformat/ape.c
new file mode 100644
index 0000000000..336871484e
--- /dev/null
+++ b/libavformat/ape.c
@@ -0,0 +1,392 @@
+/*
+ * Monkey's Audio APE demuxer
+ * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
+ *  based upon libdemac from Dave Chapman.
+ *
+ * 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 <stdio.h>
+
+#include "avformat.h"
+
+/* The earliest and latest file formats supported by this library */
+#define APE_MIN_VERSION 3970
+#define APE_MAX_VERSION 3990
+
+#define MAC_FORMAT_FLAG_8_BIT                 1 // is 8-bit [OBSOLETE]
+#define MAC_FORMAT_FLAG_CRC                   2 // uses the new CRC32 error detection [OBSOLETE]
+#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL        4 // uint32 nPeakLevel after the header [OBSOLETE]
+#define MAC_FORMAT_FLAG_24_BIT                8 // is 24-bit [OBSOLETE]
+#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS    16 // has the number of seek elements after the peak level
+#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER    32 // create the wave header on decompression (not stored)
+
+#define MAC_SUBFRAME_SIZE 4608
+
+#define APE_EXTRADATA_SIZE 6
+
+typedef struct {
+    int64_t pos;
+    int nblocks;
+    int size;
+    int skip;
+    int64_t pts;
+} APEFrame;
+
+typedef struct {
+    /* Derived fields */
+    uint32_t junklength;
+    uint32_t firstframe;
+    uint32_t totalsamples;
+    int currentframe;
+    APEFrame *frames;
+
+    /* Info from Descriptor Block */
+    char magic[4];
+    int16_t fileversion;
+    int16_t padding1;
+    uint32_t descriptorlength;
+    uint32_t headerlength;
+    uint32_t seektablelength;
+    uint32_t wavheaderlength;
+    uint32_t audiodatalength;
+    uint32_t audiodatalength_high;
+    uint32_t wavtaillength;
+    uint8_t md5[16];
+
+    /* Info from Header Block */
+    uint16_t compressiontype;
+    uint16_t formatflags;
+    uint32_t blocksperframe;
+    uint32_t finalframeblocks;
+    uint32_t totalframes;
+    uint16_t bps;
+    uint16_t channels;
+    uint32_t samplerate;
+
+    /* Seektable */
+    uint32_t *seektable;
+} APEContext;
+
+static int ape_probe(AVProbeData * p)
+{
+    if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ')
+        return AVPROBE_SCORE_MAX;
+
+    return 0;
+}
+
+static void ape_dumpinfo(APEContext * ape_ctx)
+{
+    int i;
+
+    av_log(NULL, AV_LOG_DEBUG, "Descriptor Block:\n\n");
+    av_log(NULL, AV_LOG_DEBUG, "magic                = \"%c%c%c%c\"\n", ape_ctx->magic[0], ape_ctx->magic[1], ape_ctx->magic[2], ape_ctx->magic[3]);
+    av_log(NULL, AV_LOG_DEBUG, "fileversion          = %d\n", ape_ctx->fileversion);
+    av_log(NULL, AV_LOG_DEBUG, "descriptorlength     = %d\n", ape_ctx->descriptorlength);
+    av_log(NULL, AV_LOG_DEBUG, "headerlength         = %d\n", ape_ctx->headerlength);
+    av_log(NULL, AV_LOG_DEBUG, "seektablelength      = %d\n", ape_ctx->seektablelength);
+    av_log(NULL, AV_LOG_DEBUG, "wavheaderlength      = %d\n", ape_ctx->wavheaderlength);
+    av_log(NULL, AV_LOG_DEBUG, "audiodatalength      = %d\n", ape_ctx->audiodatalength);
+    av_log(NULL, AV_LOG_DEBUG, "audiodatalength_high = %d\n", ape_ctx->audiodatalength_high);
+    av_log(NULL, AV_LOG_DEBUG, "wavtaillength        = %d\n", ape_ctx->wavtaillength);
+    av_log(NULL, AV_LOG_DEBUG, "md5                  = ");
+    for (i = 0; i < 16; i++)
+         av_log(NULL, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
+    av_log(NULL, AV_LOG_DEBUG, "\n");
+
+    av_log(NULL, AV_LOG_DEBUG, "\nHeader Block:\n\n");
+
+    av_log(NULL, AV_LOG_DEBUG, "compressiontype      = %d\n", ape_ctx->compressiontype);
+    av_log(NULL, AV_LOG_DEBUG, "formatflags          = %d\n", ape_ctx->formatflags);
+    av_log(NULL, AV_LOG_DEBUG, "blocksperframe       = %d\n", ape_ctx->blocksperframe);
+    av_log(NULL, AV_LOG_DEBUG, "finalframeblocks     = %d\n", ape_ctx->finalframeblocks);
+    av_log(NULL, AV_LOG_DEBUG, "totalframes          = %d\n", ape_ctx->totalframes);
+    av_log(NULL, AV_LOG_DEBUG, "bps                  = %d\n", ape_ctx->bps);
+    av_log(NULL, AV_LOG_DEBUG, "channels             = %d\n", ape_ctx->channels);
+    av_log(NULL, AV_LOG_DEBUG, "samplerate           = %d\n", ape_ctx->samplerate);
+
+    av_log(NULL, AV_LOG_DEBUG, "\nSeektable\n\n");
+    if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
+        av_log(NULL, AV_LOG_DEBUG, "No seektable\n");
+    } else {
+        for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
+            if (i < ape_ctx->totalframes - 1) {
+                av_log(NULL, AV_LOG_DEBUG, "%8d   %d (%d bytes)\n", i, ape_ctx->seektable[i], ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
+            } else {
+                av_log(NULL, AV_LOG_DEBUG, "%8d   %d\n", i, ape_ctx->seektable[i]);
+            }
+        }
+    }
+
+    av_log(NULL, AV_LOG_DEBUG, "\nFrames\n\n");
+    for (i = 0; i < ape_ctx->totalframes; i++)
+        av_log(NULL, AV_LOG_DEBUG, "%8d   %8lld %8d (%d samples)\n", i, ape_ctx->frames[i].pos, ape_ctx->frames[i].size, ape_ctx->frames[i].nblocks);
+
+    av_log(NULL, AV_LOG_DEBUG, "\nCalculated information:\n\n");
+    av_log(NULL, AV_LOG_DEBUG, "junklength           = %d\n", ape_ctx->junklength);
+    av_log(NULL, AV_LOG_DEBUG, "firstframe           = %d\n", ape_ctx->firstframe);
+    av_log(NULL, AV_LOG_DEBUG, "totalsamples         = %d\n", ape_ctx->totalsamples);
+}
+
+static int ape_read_header(AVFormatContext * s, AVFormatParameters * ap)
+{
+    ByteIOContext *pb = &s->pb;
+    APEContext *ape = s->priv_data;
+    AVStream *st;
+    uint32_t tag;
+    int i;
+    int total_blocks;
+    int64_t pts;
+
+    /* TODO: Skip any leading junk such as id3v2 tags */
+    ape->junklength = 0;
+
+    tag = get_le32(pb);
+    if (tag != MKTAG('M', 'A', 'C', ' '))
+        return -1;
+
+    ape->fileversion = get_le16(pb);
+
+    if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
+        av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
+        return -1;
+    }
+
+    if (ape->fileversion >= 3980) {
+        ape->padding1             = get_le16(pb);
+        ape->descriptorlength     = get_le32(pb);
+        ape->headerlength         = get_le32(pb);
+        ape->seektablelength      = get_le32(pb);
+        ape->wavheaderlength      = get_le32(pb);
+        ape->audiodatalength      = get_le32(pb);
+        ape->audiodatalength_high = get_le32(pb);
+        ape->wavtaillength        = get_le32(pb);
+        get_buffer(pb, ape->md5, 16);
+
+        /* Skip any unknown bytes at the end of the descriptor.
+           This is for future compatibility */
+        if (ape->descriptorlength > 52)
+            url_fseek(pb, ape->descriptorlength - 52, SEEK_CUR);
+
+        /* Read header data */
+        ape->compressiontype      = get_le16(pb);
+        ape->formatflags          = get_le16(pb);
+        ape->blocksperframe       = get_le32(pb);
+        ape->finalframeblocks     = get_le32(pb);
+        ape->totalframes          = get_le32(pb);
+        ape->bps                  = get_le16(pb);
+        ape->channels             = get_le16(pb);
+        ape->samplerate           = get_le32(pb);
+    } else {
+        ape->descriptorlength = 0;
+        ape->headerlength = 32;
+
+        ape->compressiontype      = get_le16(pb);
+        ape->formatflags          = get_le16(pb);
+        ape->channels             = get_le16(pb);
+        ape->samplerate           = get_le32(pb);
+        ape->wavheaderlength      = get_le32(pb);
+        ape->wavtaillength        = get_le32(pb);
+        ape->totalframes          = get_le32(pb);
+        ape->finalframeblocks     = get_le32(pb);
+
+        if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
+            url_fseek(pb, 4, SEEK_CUR); /* Skip the peak level */
+            ape->headerlength += 4;
+        }
+
+        if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
+            ape->seektablelength = get_le32(pb);
+            ape->headerlength += 4;
+            ape->seektablelength *= sizeof(int32_t);
+        } else
+            ape->seektablelength = ape->totalframes * sizeof(int32_t);
+
+        if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
+            ape->bps = 8;
+        else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
+            ape->bps = 24;
+        else
+            ape->bps = 16;
+
+        if (ape->fileversion >= 3950)
+            ape->blocksperframe = 73728 * 4;
+        else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800  && ape->compressiontype >= 4000))
+            ape->blocksperframe = 73728;
+        else
+            ape->blocksperframe = 9216;
+
+        /* Skip any stored wav header */
+        if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
+            url_fskip(pb, ape->wavheaderlength);
+    }
+
+    if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
+        av_log(s, AV_LOG_ERROR, "Too many frames: %d\n", ape->totalframes);
+        return -1;
+    }
+    ape->frames       = av_malloc(ape->totalframes * sizeof(APEFrame));
+    if(!ape->frames)
+        return AVERROR_NOMEM;
+    ape->firstframe   = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
+    ape->currentframe = 0;
+
+
+    ape->totalsamples = ape->finalframeblocks;
+    if (ape->totalframes > 1)
+        ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
+
+    if (ape->seektablelength > 0) {
+        ape->seektable = av_malloc(ape->seektablelength);
+        for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++)
+            ape->seektable[i] = get_le32(pb);
+    }
+
+    ape->frames[0].pos     = ape->firstframe;
+    ape->frames[0].nblocks = ape->blocksperframe;
+    ape->frames[0].skip    = 0;
+    for (i = 1; i < ape->totalframes; i++) {
+        ape->frames[i].pos      = ape->seektable[i]; //ape->frames[i-1].pos + ape->blocksperframe;
+        ape->frames[i].nblocks  = ape->blocksperframe;
+        ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
+        ape->frames[i].skip     = (ape->frames[i].pos - ape->frames[0].pos) & 3;
+    }
+    ape->frames[ape->totalframes - 1].size    = ape->finalframeblocks * 4;
+    ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
+
+    for (i = 0; i < ape->totalframes; i++) {
+        if(ape->frames[i].skip){
+            ape->frames[i].pos  -= ape->frames[i].skip;
+            ape->frames[i].size += ape->frames[i].skip;
+        }
+        ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
+    }
+
+
+    ape_dumpinfo(ape);
+
+    av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10, ape->compressiontype);
+
+    /* now we are ready: build format streams */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return -1;
+
+    total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
+
+    st->codec->codec_type      = CODEC_TYPE_AUDIO;
+    st->codec->codec_id        = CODEC_ID_APE;
+    st->codec->codec_tag       = MKTAG('A', 'P', 'E', ' ');
+    st->codec->channels        = ape->channels;
+    st->codec->sample_rate     = ape->samplerate;
+    st->codec->bits_per_sample = ape->bps;
+    st->codec->frame_size      = MAC_SUBFRAME_SIZE;
+
+    st->nb_frames = ape->totalframes;
+    s->start_time = 0;
+    s->duration   = (int64_t) total_blocks * AV_TIME_BASE / ape->samplerate;
+    av_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate);
+
+    st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE);
+    st->codec->extradata_size = APE_EXTRADATA_SIZE;
+    AV_WL16(st->codec->extradata + 0, ape->fileversion);
+    AV_WL16(st->codec->extradata + 2, ape->compressiontype);
+    AV_WL16(st->codec->extradata + 4, ape->formatflags);
+
+    pts = 0;
+    for (i = 0; i < ape->totalframes; i++) {
+        ape->frames[i].pts = pts;
+        av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
+        pts += ape->blocksperframe / MAC_SUBFRAME_SIZE;
+    }
+
+    return 0;
+}
+
+static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
+{
+    int ret;
+    int nblocks;
+    APEContext *ape = s->priv_data;
+    uint32_t extra_size = 8;
+
+    if (url_feof(&s->pb))
+        return AVERROR_IO;
+    if (ape->currentframe > ape->totalframes)
+        return AVERROR_IO;
+
+    url_fseek (&s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
+
+    /* Calculate how many blocks there are in this frame */
+    if (ape->currentframe == (ape->totalframes - 1))
+        nblocks = ape->finalframeblocks;
+    else
+        nblocks = ape->blocksperframe;
+
+    if (av_new_packet(pkt,  ape->frames[ape->currentframe].size + extra_size) < 0)
+        return AVERROR_NOMEM;
+
+    AV_WL32(pkt->data    , nblocks);
+    AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
+    ret = get_buffer(&s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
+
+    pkt->pts = ape->frames[ape->currentframe].pts;
+    pkt->stream_index = 0;
+
+    /* note: we need to modify the packet size here to handle the last
+       packet */
+    pkt->size = ret + extra_size;
+
+    ape->currentframe++;
+
+    return 0;
+}
+
+static int ape_read_close(AVFormatContext * s)
+{
+    APEContext *ape = s->priv_data;
+
+    av_freep(&ape->frames);
+    av_freep(&ape->seektable);
+    return 0;
+}
+
+static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
+{
+    AVStream *st = s->streams[stream_index];
+    APEContext *ape = s->priv_data;
+    int index = av_index_search_timestamp(st, timestamp, flags);
+
+    if (index < 0)
+        return -1;
+
+    ape->currentframe = index;
+    return 0;
+}
+
+AVInputFormat ape_demuxer = {
+    "ape",
+    "Monkey's Audio",
+    sizeof(APEContext),
+    ape_probe,
+    ape_read_header,
+    ape_read_packet,
+    ape_read_close,
+    ape_read_seek,
+    .extensions = "ape,apl,mac"
+};