@@ -85,6 +85,7 @@ version <next>:

 - Mobotix MxPEG decoder

 - AAC encoding via libvo-aacenc

 - AMR-WB encoding via libvo-amrwbenc

+- xWMA demuxer

 version 0.6:

@@ -258,6 +258,8 @@ library:

     @tab Multimedia format used in Westwood Studios games.

 @item Westwood Studios VQA      @tab   @tab X

     @tab Multimedia format used in Westwood Studios games.

+@item xWMA                      @tab   @tab X

+    @tab Microsoft audio container used by XAudio 2.

 @item YUV4MPEG pipe             @tab X @tab X

 @item Psygnosis YOP             @tab   @tab X

 @end multitable

@@ -299,6 +299,7 @@ OBJS-$(CONFIG_WSVQA_DEMUXER)             += westwood.o

 OBJS-$(CONFIG_WTV_DEMUXER)               += wtv.o asf.o asfdec.o mpegts.o riff.o

 OBJS-$(CONFIG_WV_DEMUXER)                += wv.o apetag.o

 OBJS-$(CONFIG_XA_DEMUXER)                += xa.o

+OBJS-$(CONFIG_XWMA_DEMUXER)              += xwma.o riff.o

 OBJS-$(CONFIG_YOP_DEMUXER)               += yop.o

 OBJS-$(CONFIG_YUV4MPEGPIPE_MUXER)        += yuv4mpeg.o

 OBJS-$(CONFIG_YUV4MPEGPIPE_DEMUXER)      += yuv4mpeg.o

@@ -225,6 +225,7 @@ void av_register_all(void)

     REGISTER_DEMUXER  (WTV, wtv);

     REGISTER_DEMUXER  (WV, wv);

     REGISTER_DEMUXER  (XA, xa);

+    REGISTER_DEMUXER  (XWMA, xwma);

     REGISTER_DEMUXER  (YOP, yop);

     REGISTER_MUXDEMUX (YUV4MPEGPIPE, yuv4mpegpipe);

@@ -24,7 +24,7 @@

 #include "libavutil/avutil.h"

 #define LIBAVFORMAT_VERSION_MAJOR 52

-#define LIBAVFORMAT_VERSION_MINOR 107

+#define LIBAVFORMAT_VERSION_MINOR 108

 #define LIBAVFORMAT_VERSION_MICRO  0

 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \

new file mode 100644

@@ -0,0 +1,254 @@

+/*

+ * xWMA demuxer

+ * Copyright (c) 2011 Max Horn

+ *

+ * 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 "avformat.h"

+#include "riff.h"

+

+/*

+ * Demuxer for xWMA, a Microsoft audio container used by XAudio 2.

+ */

+

+typedef struct {

+    int64_t data_end;

+} XWMAContext;

+

+static int xwma_probe(AVProbeData *p)

+{

+    if (!memcmp(p->buf, "RIFF", 4) && !memcmp(p->buf + 8, "XWMA", 4))

+        return AVPROBE_SCORE_MAX;

+    return 0;

+}

+

+static int xwma_read_header(AVFormatContext *s, AVFormatParameters *ap)

+{

+    int64_t size, av_uninit(data_size);

+    uint32_t dpds_table_size = 0;

+    uint32_t *dpds_table = 0;

+    unsigned int tag;

+    AVIOContext *pb = s->pb;

+    AVStream *st;

+    XWMAContext *xwma = s->priv_data;

+    int i;

+

+    /* The following code is mostly copied from wav.c, with some

+     * minor alterations.

+     */

+

+    /* check RIFF header */

+    tag = avio_rl32(pb);

+    if (tag != MKTAG('R', 'I', 'F', 'F'))

+        return -1;

+    avio_rl32(pb); /* file size */

+    tag = avio_rl32(pb);

+    if (tag != MKTAG('X', 'W', 'M', 'A'))

+        return -1;

+

+    /* parse fmt header */

+    tag = avio_rl32(pb);

+    if (tag != MKTAG('f', 'm', 't', ' '))

+        return -1;

+    size = avio_rl32(pb);

+    st = av_new_stream(s, 0);

+    if (!st)

+        return AVERROR(ENOMEM);

+

+    ff_get_wav_header(pb, st->codec, size);

+    st->need_parsing = AVSTREAM_PARSE_NONE;

+

+    /* All xWMA files I have seen contained WMAv2 data. If there are files

+     * using WMA Pro or some other codec, then we need to figure out the right

+     * extradata for that. Thus, ask the user for feedback, but try to go on

+     * anyway.

+     */

+    if (st->codec->codec_id != CODEC_ID_WMAV2) {

+        av_log(s, AV_LOG_WARNING, "unexpected codec (tag 0x04%x; id %d)\n",

+                              st->codec->codec_tag, st->codec->codec_id);

+        av_log_ask_for_sample(s, NULL);

+    } else {

+        /* In all xWMA files I have seen, there is no extradata. But the WMA

+         * codecs require extradata, so we provide our own fake extradata.

+         *

+         * First, check that there really was no extradata in the header. If

+         * there was, then try to use, after asking the the user to provide a

+         * sample of this unusual file.

+         */

+        if (st->codec->extradata_size != 0) {

+            /* Surprise, surprise: We *did* get some extradata. No idea

+             * if it will work, but just go on and try it, after asking

+             * the user for a sample.

+             */

+            av_log(s, AV_LOG_WARNING, "unexpected extradata (%d bytes)\n",

+                                  st->codec->extradata_size);

+            av_log_ask_for_sample(s, NULL);

+        } else {

+            st->codec->extradata_size = 6;

+            st->codec->extradata      = av_mallocz(6 + FF_INPUT_BUFFER_PADDING_SIZE);

+            if (!st->codec->extradata)

+                return AVERROR(ENOMEM);

+

+            /* setup extradata with our experimentally obtained value */

+            st->codec->extradata[4] = 31;

+        }

+    }

+

+    /* set the sample rate */

+    av_set_pts_info(st, 64, 1, st->codec->sample_rate);

+

+    /* parse the remaining RIFF chunks */

+    for (;;) {

+        if (pb->eof_reached)

+            return -1;

+        /* read next chunk tag */

+        tag = avio_rl32(pb);

+        size = avio_rl32(pb);

+        if (tag == MKTAG('d', 'a', 't', 'a')) {

+            /* We assume that the data chunk comes last. */

+            break;

+        } else if (tag == MKTAG('d','p','d','s')) {

+            /* Quoting the MSDN xWMA docs on the dpds chunk: "Contains the

+             * decoded packet cumulative data size array, each element is the

+             * number of bytes accumulated after the corresponding xWMA packet

+             * is decoded in order"

+             *

+             * Each packet has size equal to st->codec->block_align, which in

+             * all cases I saw so far was always 2230. Thus, we can use the

+             * dpds data to compute a seeking index.

+             */

+

+            /* Error out if there is more than one dpds chunk. */

+            if (dpds_table) {

+                av_log(s, AV_LOG_ERROR, "two dpds chunks present\n");

+                return -1;

+            }

+

+            /* Compute the number of entries in the dpds chunk. */

+            if (size & 3) {  /* Size should be divisible by four */

+                av_log(s, AV_LOG_WARNING, "dpds chunk size "PRId64" not divisible by 4\n", size);

+            }

+            dpds_table_size = size / 4;

+            if (dpds_table_size == 0 || dpds_table_size >= INT_MAX / 4) {

+                av_log(s, AV_LOG_ERROR, "dpds chunk size "PRId64" invalid\n", size);

+                return -1;

+            }

+

+            /* Allocate some temporary storage to keep the dpds data around.

+             * for processing later on.

+             */

+            dpds_table = av_malloc(dpds_table_size * sizeof(uint32_t));

+            if (!dpds_table) {

+                return AVERROR(ENOMEM);

+            }

+

+            for (i = 0; i < dpds_table_size; ++i) {

+                dpds_table[i] = avio_rl32(pb);

+                size -= 4;

+            }

+        }

+        avio_skip(pb, size);

+    }

+

+    /* Determine overall data length */

+    if (size < 0)

+        return -1;

+    if (!size) {

+        xwma->data_end = INT64_MAX;

+    } else

+        xwma->data_end = avio_tell(pb) + size;

+

+

+    if (dpds_table && dpds_table_size) {

+        int64_t cur_pos;

+        const uint32_t bytes_per_sample

+                = (st->codec->channels * st->codec->bits_per_coded_sample) >> 3;

+

+        /* Estimate the duration from the total number of output bytes. */

+        const uint64_t total_decoded_bytes = dpds_table[dpds_table_size - 1];

+        st->duration = total_decoded_bytes / bytes_per_sample;

+

+        /* Use the dpds data to build a seek table.  We can only do this after

+         * we know the offset to the data chunk, as we need that to determine

+         * the actual offset to each input block.

+         * Note: If we allowed ourselves to assume that the data chunk always

+         * follows immediately after the dpds block, we could of course guess

+         * the data block's start offset already while reading the dpds chunk.

+         * I decided against that, just in case other chunks ever are

+         * discovered.

+         */

+        cur_pos = avio_tell(pb);

+        for (i = 0; i < dpds_table_size; ++i) {

+            /* From the number of output bytes that would accumulate in the

+             * output buffer after decoding the first (i+1) packets, we compute

+             * an offset / timestamp pair.

+             */

+            av_add_index_entry(st,

+                               cur_pos + (i+1) * st->codec->block_align, /* pos */

+                               dpds_table[i] / bytes_per_sample,         /* timestamp */

+                               st->codec->block_align,                   /* size */

+                               0,                                        /* duration */

+                               AVINDEX_KEYFRAME);

+        }

+    } else if (st->codec->bit_rate) {

+        /* No dpds chunk was present (or only an empty one), so estimate

+         * the total duration using the average bits per sample and the

+         * total data length.

+         */

+        st->duration = (size<<3) * st->codec->sample_rate / st->codec->bit_rate;

+    }

+

+    av_free(dpds_table);

+

+    return 0;

+}

+

+static int xwma_read_packet(AVFormatContext *s, AVPacket *pkt)

+{

+    int ret, size;

+    int64_t left;

+    AVStream *st;

+    XWMAContext *xwma = s->priv_data;

+

+    st = s->streams[0];

+

+    left = xwma->data_end - avio_tell(s->pb);

+    if (left <= 0) {

+        return AVERROR_EOF;

+    }

+

+    /* read a single block; the default block size is 2230. */

+    size = (st->codec->block_align > 1) ? st->codec->block_align : 2230;

+    size = FFMIN(size, left);

+

+    ret  = av_get_packet(s->pb, pkt, size);

+    if (ret < 0)

+        return ret;

+

+    pkt->stream_index = 0;

+    return ret;

+}

+

+AVInputFormat ff_xwma_demuxer = {

+    "xwma",

+    NULL_IF_CONFIG_SMALL("Microsoft xWMA"),

+    sizeof(XWMAContext),

+    xwma_probe,

+    xwma_read_header,

+    xwma_read_packet,

+};