lavf: rename wv.c to wvdec.c

wv.c will be used for shared wavpack functions.

1 files changed, 366 insertions, 0 deletions

diff --git a/libavformat/wvdec.c b/libavformat/wvdec.c
new file mode 100644
index 0000000000..3e090001c4
--- /dev/null
+++ b/libavformat/wvdec.c
@@ -0,0 +1,366 @@
+/*
+ * WavPack demuxer
+ * Copyright (c) 2006,2011 Konstantin Shishkov
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/dict.h"
+#include "avformat.h"
+#include "internal.h"
+#include "apetag.h"
+#include "id3v1.h"
+
+// specs say that maximum block size is 1Mb
+#define WV_BLOCK_LIMIT 1047576
+
+#define WV_HEADER_SIZE 32
+
+#define WV_START_BLOCK  0x0800
+#define WV_END_BLOCK    0x1000
+#define WV_SINGLE_BLOCK (WV_START_BLOCK | WV_END_BLOCK)
+
+enum WV_FLAGS {
+    WV_MONO   = 0x0004,
+    WV_HYBRID = 0x0008,
+    WV_JOINT  = 0x0010,
+    WV_CROSSD = 0x0020,
+    WV_HSHAPE = 0x0040,
+    WV_FLOAT  = 0x0080,
+    WV_INT32  = 0x0100,
+    WV_HBR    = 0x0200,
+    WV_HBAL   = 0x0400,
+    WV_MCINIT = 0x0800,
+    WV_MCEND  = 0x1000,
+};
+
+static const int wv_rates[16] = {
+     6000,  8000,  9600, 11025, 12000, 16000,  22050, 24000,
+    32000, 44100, 48000, 64000, 88200, 96000, 192000,    -1
+};
+
+typedef struct {
+    uint8_t block_header[WV_HEADER_SIZE];
+    uint32_t blksize, flags;
+    int rate, chan, bpp;
+    uint32_t chmask;
+    uint32_t samples, soff;
+    int multichannel;
+    int block_parsed;
+    int64_t pos;
+
+    int64_t apetag_start;
+} WVContext;
+
+static int wv_probe(AVProbeData *p)
+{
+    /* check file header */
+    if (p->buf_size <= 32)
+        return 0;
+    if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
+        p->buf[2] == 'p' && p->buf[3] == 'k')
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
+{
+    WVContext *wc = ctx->priv_data;
+    uint32_t ver;
+    int size, ret;
+    int rate, bpp, chan;
+    uint32_t chmask;
+
+    wc->pos = avio_tell(pb);
+
+    /* don't return bogus packets with the ape tag data */
+    if (wc->apetag_start && wc->pos >= wc->apetag_start)
+        return AVERROR_EOF;
+
+    ret = avio_read(pb, wc->block_header, WV_HEADER_SIZE);
+    if (ret != WV_HEADER_SIZE)
+        return (ret < 0) ? ret : AVERROR_EOF;
+
+    if (AV_RL32(wc->block_header) != MKTAG('w', 'v', 'p', 'k'))
+        return AVERROR_INVALIDDATA;
+
+    size = AV_RL32(wc->block_header + 4);
+    if (size < 24 || size > WV_BLOCK_LIMIT) {
+        av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
+        return AVERROR_INVALIDDATA;
+    }
+    wc->blksize = size;
+    ver = AV_RL32(wc->block_header + 8);
+    if (ver < 0x402 || ver > 0x410) {
+        av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
+        return AVERROR_PATCHWELCOME;
+    }
+    wc->samples = AV_RL32(wc->block_header + 12); // total samples in file
+    wc->soff    = AV_RL32(wc->block_header + 16); // offset in samples of current block
+    wc->flags   = AV_RL32(wc->block_header + 24);
+    /* Blocks with zero samples don't contain actual audio information
+     * and should be ignored */
+    if (!AV_RN32(wc->block_header + 20))
+        return 0;
+    // parse flags
+    bpp    = ((wc->flags & 3) + 1) << 3;
+    chan   = 1 + !(wc->flags & WV_MONO);
+    chmask = wc->flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
+    rate   = wv_rates[(wc->flags >> 23) & 0xF];
+    wc->multichannel = !!((wc->flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK);
+    if (wc->multichannel) {
+        chan   = wc->chan;
+        chmask = wc->chmask;
+    }
+    if ((rate == -1 || !chan) && !wc->block_parsed) {
+        int64_t block_end = avio_tell(pb) + wc->blksize - 24;
+        if (!pb->seekable) {
+            av_log(ctx, AV_LOG_ERROR,
+                   "Cannot determine additional parameters\n");
+            return AVERROR_INVALIDDATA;
+        }
+        while (avio_tell(pb) < block_end) {
+            int id, size;
+            id   = avio_r8(pb);
+            size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
+            size <<= 1;
+            if (id & 0x40)
+                size--;
+            switch (id & 0x3F) {
+            case 0xD:
+                if (size <= 1) {
+                    av_log(ctx, AV_LOG_ERROR,
+                           "Insufficient channel information\n");
+                    return AVERROR_INVALIDDATA;
+                }
+                chan = avio_r8(pb);
+                switch (size - 2) {
+                case 0:
+                    chmask = avio_r8(pb);
+                    break;
+                case 1:
+                    chmask = avio_rl16(pb);
+                    break;
+                case 2:
+                    chmask = avio_rl24(pb);
+                    break;
+                case 3:
+                    chmask = avio_rl32(pb);
+                    break;
+                case 5:
+                    avio_skip(pb, 1);
+                    chan  |= (avio_r8(pb) & 0xF) << 8;
+                    chmask = avio_rl24(pb);
+                    break;
+                default:
+                    av_log(ctx, AV_LOG_ERROR,
+                           "Invalid channel info size %d\n", size);
+                    return AVERROR_INVALIDDATA;
+                }
+                break;
+            case 0x27:
+                rate = avio_rl24(pb);
+                break;
+            default:
+                avio_skip(pb, size);
+            }
+            if (id & 0x40)
+                avio_skip(pb, 1);
+        }
+        if (rate == -1) {
+            av_log(ctx, AV_LOG_ERROR,
+                   "Cannot determine custom sampling rate\n");
+            return AVERROR_INVALIDDATA;
+        }
+        avio_seek(pb, block_end - wc->blksize + 24, SEEK_SET);
+    }
+    if (!wc->bpp)
+        wc->bpp    = bpp;
+    if (!wc->chan)
+        wc->chan   = chan;
+    if (!wc->chmask)
+        wc->chmask = chmask;
+    if (!wc->rate)
+        wc->rate   = rate;
+
+    if (wc->flags && bpp != wc->bpp) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Bits per sample differ, this block: %i, header block: %i\n",
+               bpp, wc->bpp);
+        return AVERROR_INVALIDDATA;
+    }
+    if (wc->flags && !wc->multichannel && chan != wc->chan) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Channels differ, this block: %i, header block: %i\n",
+               chan, wc->chan);
+        return AVERROR_INVALIDDATA;
+    }
+    if (wc->flags && rate != -1 && rate != wc->rate) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Sampling rate differ, this block: %i, header block: %i\n",
+               rate, wc->rate);
+        return AVERROR_INVALIDDATA;
+    }
+    wc->blksize = size - 24;
+    return 0;
+}
+
+static int wv_read_header(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    WVContext *wc = s->priv_data;
+    AVStream *st;
+    int ret;
+
+    wc->block_parsed = 0;
+    for (;;) {
+        if ((ret = wv_read_block_header(s, pb)) < 0)
+            return ret;
+        if (!AV_RL32(wc->block_header + 20))
+            avio_skip(pb, wc->blksize - 24);
+        else
+            break;
+    }
+
+    /* now we are ready: build format streams */
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    st->codec->codec_type            = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id              = AV_CODEC_ID_WAVPACK;
+    st->codec->channels              = wc->chan;
+    st->codec->channel_layout        = wc->chmask;
+    st->codec->sample_rate           = wc->rate;
+    st->codec->bits_per_coded_sample = wc->bpp;
+    avpriv_set_pts_info(st, 64, 1, wc->rate);
+    st->start_time = 0;
+    st->duration   = wc->samples;
+
+    if (s->pb->seekable) {
+        int64_t cur = avio_tell(s->pb);
+        wc->apetag_start = ff_ape_parse_tag(s);
+        if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
+            ff_id3v1_read(s);
+        avio_seek(s->pb, cur, SEEK_SET);
+    }
+
+    return 0;
+}
+
+static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    WVContext *wc = s->priv_data;
+    int ret;
+    int off;
+    int64_t pos;
+    uint32_t block_samples;
+
+    if (s->pb->eof_reached)
+        return AVERROR_EOF;
+    if (wc->block_parsed) {
+        if ((ret = wv_read_block_header(s, s->pb)) < 0)
+            return ret;
+    }
+
+    pos = wc->pos;
+    if (av_new_packet(pkt, wc->blksize + WV_HEADER_SIZE) < 0)
+        return AVERROR(ENOMEM);
+    memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE);
+    ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->blksize);
+    if (ret != wc->blksize) {
+        av_free_packet(pkt);
+        return AVERROR(EIO);
+    }
+    while (!(wc->flags & WV_END_BLOCK)) {
+        if ((ret = wv_read_block_header(s, s->pb)) < 0) {
+            av_free_packet(pkt);
+            return ret;
+        }
+
+        off = pkt->size;
+        if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->blksize)) < 0) {
+            av_free_packet(pkt);
+            return ret;
+        }
+        memcpy(pkt->data + off, wc->block_header, WV_HEADER_SIZE);
+
+        ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->blksize);
+        if (ret != wc->blksize) {
+            av_free_packet(pkt);
+            return (ret < 0) ? ret : AVERROR_EOF;
+        }
+    }
+    pkt->stream_index = 0;
+    wc->block_parsed  = 1;
+    pkt->pts          = wc->soff;
+    block_samples     = AV_RL32(wc->block_header + 20);
+    if (block_samples > INT32_MAX)
+        av_log(s, AV_LOG_WARNING,
+               "Too many samples in block: %"PRIu32"\n", block_samples);
+    else
+        pkt->duration = block_samples;
+
+    av_add_index_entry(s->streams[0], pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
+    return 0;
+}
+
+static int wv_read_seek(AVFormatContext *s, int stream_index,
+                        int64_t timestamp, int flags)
+{
+    AVStream  *st = s->streams[stream_index];
+    WVContext *wc = s->priv_data;
+    AVPacket pkt1, *pkt = &pkt1;
+    int ret;
+    int index = av_index_search_timestamp(st, timestamp, flags);
+    int64_t pos, pts;
+
+    /* if found, seek there */
+    if (index >= 0 &&
+        timestamp <= st->index_entries[st->nb_index_entries - 1].timestamp) {
+        wc->block_parsed = 1;
+        avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET);
+        return 0;
+    }
+    /* if timestamp is out of bounds, return error */
+    if (timestamp < 0 || timestamp >= s->duration)
+        return AVERROR(EINVAL);
+
+    pos = avio_tell(s->pb);
+    do {
+        ret = av_read_frame(s, pkt);
+        if (ret < 0) {
+            avio_seek(s->pb, pos, SEEK_SET);
+            return ret;
+        }
+        pts = pkt->pts;
+        av_free_packet(pkt);
+    } while(pts < timestamp);
+    return 0;
+}
+
+AVInputFormat ff_wv_demuxer = {
+    .name           = "wv",
+    .long_name      = NULL_IF_CONFIG_SMALL("WavPack"),
+    .priv_data_size = sizeof(WVContext),
+    .read_probe     = wv_probe,
+    .read_header    = wv_read_header,
+    .read_packet    = wv_read_packet,
+    .read_seek      = wv_read_seek,
+};