add XMV demuxer

Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 576 insertions, 0 deletions

diff --git a/libavformat/xmv.c b/libavformat/xmv.c
new file mode 100644
index 0000000000..a6081aff7b
--- /dev/null
+++ b/libavformat/xmv.c
@@ -0,0 +1,576 @@
+/*
+ * Microsoft XMV demuxer
+ * Copyright (c) 2011 Sven Hesse <drmccoy@drmccoy.de>
+ * Copyright (c) 2011 Matthew Hoops <clone2727@gmail.com>
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Microsoft XMV demuxer
+ */
+
+#include <stdint.h>
+
+#include "libavutil/intreadwrite.h"
+
+#include "avformat.h"
+#include "riff.h"
+
+#define XMV_MIN_HEADER_SIZE 36
+
+#define XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT 1
+#define XMV_AUDIO_ADPCM51_FRONTCENTERLOW 2
+#define XMV_AUDIO_ADPCM51_REARLEFTRIGHT  4
+
+#define XMV_AUDIO_ADPCM51 (XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT | \
+                           XMV_AUDIO_ADPCM51_FRONTCENTERLOW | \
+                           XMV_AUDIO_ADPCM51_REARLEFTRIGHT)
+
+typedef struct XMVAudioTrack {
+    uint16_t compression;
+    uint16_t channels;
+    uint32_t sample_rate;
+    uint16_t bits_per_sample;
+    uint32_t bit_rate;
+    uint16_t flags;
+    uint16_t block_align;
+    uint16_t block_samples;
+
+    enum CodecID codec_id;
+} XMVAudioTrack;
+
+typedef struct XMVVideoPacket {
+    /* The decoder stream index for this video packet. */
+    int stream_index;
+
+    uint32_t data_size;
+    uint32_t data_offset;
+
+    uint32_t current_frame;
+    uint32_t frame_count;
+
+    /* Does the video packet contain extra data? */
+    int has_extradata;
+
+    /* Extra data */
+    uint8_t extradata[4];
+
+    int64_t last_pts;
+    int64_t pts;
+} XMVVideoPacket;
+
+typedef struct XMVAudioPacket {
+    /* The decoder stream index for this audio packet. */
+    int stream_index;
+
+    /* The audio track this packet encodes. */
+    XMVAudioTrack *track;
+
+    uint32_t data_size;
+    uint32_t data_offset;
+
+    uint32_t frame_size;
+
+    uint32_t block_count;
+} XMVAudioPacket;
+
+typedef struct XMVDemuxContext {
+    uint16_t audio_track_count;
+
+    XMVAudioTrack *audio_tracks;
+
+    uint32_t this_packet_size;
+    uint32_t next_packet_size;
+
+    uint32_t this_packet_offset;
+    uint32_t next_packet_offset;
+
+    uint16_t current_stream;
+    uint16_t stream_count;
+
+    XMVVideoPacket  video;
+    XMVAudioPacket *audio;
+} XMVDemuxContext;
+
+static int xmv_probe(AVProbeData *p)
+{
+    uint32_t file_version;
+
+    if (p->buf_size < XMV_MIN_HEADER_SIZE)
+        return 0;
+
+    file_version = AV_RL32(p->buf + 16);
+    if ((file_version == 0) || (file_version > 4))
+        return 0;
+
+    if (!memcmp(p->buf + 12, "xobX", 4))
+        return AVPROBE_SCORE_MAX;
+
+    return 0;
+}
+
+static int xmv_read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)
+{
+    XMVDemuxContext *xmv = s->priv_data;
+    AVIOContext     *pb  = s->pb;
+    AVStream        *vst = NULL;
+
+    uint32_t file_version;
+    uint32_t this_packet_size;
+    uint16_t audio_track;
+
+    avio_skip(pb, 4); /* Next packet size */
+
+    this_packet_size = avio_rl32(pb);
+
+    avio_skip(pb, 4); /* Max packet size */
+    avio_skip(pb, 4); /* "xobX" */
+
+    file_version = avio_rl32(pb);
+    if ((file_version != 4) && (file_version != 2))
+        av_log_ask_for_sample(s, "Found uncommon version %d\n", file_version);
+
+
+    /* Video track */
+
+    vst = av_new_stream(s, 0);
+    if (!vst)
+        return AVERROR(ENOMEM);
+
+    av_set_pts_info(vst, 32, 1, 1000);
+
+    vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    vst->codec->codec_id   = CODEC_ID_WMV2;
+    vst->codec->codec_tag  = MKBETAG('W', 'M', 'V', '2');
+    vst->codec->width      = avio_rl32(pb);
+    vst->codec->height     = avio_rl32(pb);
+
+    vst->duration          = avio_rl32(pb);
+
+    xmv->video.stream_index = vst->index;
+
+    /* Audio tracks */
+
+    xmv->audio_track_count = avio_rl16(pb);
+
+    avio_skip(pb, 2); /* Unknown (padding?) */
+
+    xmv->audio_tracks = av_malloc(xmv->audio_track_count * sizeof(XMVAudioTrack));
+    if (!xmv->audio_tracks)
+        return AVERROR(ENOMEM);
+
+    xmv->audio = av_malloc(xmv->audio_track_count * sizeof(XMVAudioPacket));
+    if (!xmv->audio)
+        return AVERROR(ENOMEM);
+
+    for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
+        XMVAudioTrack  *track  = &xmv->audio_tracks[audio_track];
+        XMVAudioPacket *packet = &xmv->audio       [audio_track];
+        AVStream *ast = NULL;
+
+        track->compression     = avio_rl16(pb);
+        track->channels        = avio_rl16(pb);
+        track->sample_rate     = avio_rl32(pb);
+        track->bits_per_sample = avio_rl16(pb);
+        track->flags           = avio_rl16(pb);
+
+        track->bit_rate      = track->bits_per_sample *
+                               track->sample_rate *
+                               track->channels;
+        track->block_align   = 36 * track->channels;
+        track->block_samples = 64;
+        track->codec_id      = ff_wav_codec_get_id(track->compression,
+                                                   track->bits_per_sample);
+
+        packet->track        = track;
+        packet->stream_index = -1;
+
+        packet->frame_size  = 0;
+        packet->block_count = 0;
+
+        /* TODO: ADPCM'd 5.1 sound is encoded in three separate streams.
+         *       Those need to be interleaved to a proper 5.1 stream. */
+        if (track->flags & XMV_AUDIO_ADPCM51)
+            av_log(s, AV_LOG_WARNING, "Unsupported 5.1 ADPCM audio stream "
+                                      "(0x%04X)\n", track->flags);
+
+        ast = av_new_stream(s, audio_track);
+        if (!ast)
+            return AVERROR(ENOMEM);
+
+        ast->codec->codec_type            = AVMEDIA_TYPE_AUDIO;
+        ast->codec->codec_id              = track->codec_id;
+        ast->codec->codec_tag             = track->compression;
+        ast->codec->channels              = track->channels;
+        ast->codec->sample_rate           = track->sample_rate;
+        ast->codec->bits_per_coded_sample = track->bits_per_sample;
+        ast->codec->bit_rate              = track->bit_rate;
+        ast->codec->block_align           = 36 * track->channels;
+
+        av_set_pts_info(ast, 32, track->block_samples, track->sample_rate);
+
+        packet->stream_index = ast->index;
+
+        ast->duration = vst->duration;
+    }
+
+
+    /** Initialize the packet context */
+
+    xmv->next_packet_offset = avio_tell(pb);
+
+    xmv->next_packet_size = this_packet_size - xmv->next_packet_offset;
+    xmv->this_packet_size = 0;
+
+    xmv->video.current_frame = 0;
+    xmv->video.frame_count   = 0;
+    xmv->video.pts           = 0;
+    xmv->video.last_pts      = 0;
+
+    xmv->current_stream = 0;
+    xmv->stream_count   = xmv->audio_track_count + 1;
+
+    return 0;
+}
+
+static void xmv_read_extradata(uint8_t *extradata, AVIOContext *pb)
+{
+    /* Read the XMV extradata */
+
+    uint32_t data = avio_rl32(pb);
+
+    int mspel_bit        = !!(data & 0x01);
+    int loop_filter      = !!(data & 0x02);
+    int abt_flag         = !!(data & 0x04);
+    int j_type_bit       = !!(data & 0x08);
+    int top_left_mv_flag = !!(data & 0x10);
+    int per_mb_rl_bit    = !!(data & 0x20);
+    int slice_count      = (data >> 6) & 7;
+
+    /* Write it back as standard WMV2 extradata */
+
+    data = 0;
+
+    data |= mspel_bit        << 15;
+    data |= loop_filter      << 14;
+    data |= abt_flag         << 13;
+    data |= j_type_bit       << 12;
+    data |= top_left_mv_flag << 11;
+    data |= per_mb_rl_bit    << 10;
+    data |= slice_count      <<  7;
+
+    AV_WB32(extradata, data);
+}
+
+static int xmv_process_packet_header(AVFormatContext *s)
+{
+    XMVDemuxContext *xmv = s->priv_data;
+    AVIOContext     *pb  = s->pb;
+
+    uint8_t  data[8];
+    uint16_t audio_track;
+    uint32_t data_offset;
+
+    /* Next packet size */
+    xmv->next_packet_size = avio_rl32(pb);
+
+    /* Packet video header */
+
+    if (avio_read(pb, data, 8) != 8)
+        return AVERROR(EIO);
+
+    xmv->video.data_size     = AV_RL32(data) & 0x007FFFFF;
+
+    xmv->video.current_frame = 0;
+    xmv->video.frame_count   = (AV_RL32(data) >> 23) & 0xFF;
+
+    xmv->video.has_extradata = (data[3] & 0x80) != 0;
+
+    /* Adding the audio data sizes and the video data size keeps you 4 bytes
+     * short for every audio track. But as playing around with XMV files with
+     * ADPCM audio showed, taking the extra 4 bytes from the audio data gives
+     * you either completely distorted audio or click (when skipping the
+     * remaining 68 bytes of the ADPCM block). Substracting 4 bytes for every
+     * audio track from the video data works at least for the audio. Probably
+     * some alignment thing?
+     * The video data has (always?) lots of padding, so it should work out...
+     */
+    xmv->video.data_size -= xmv->audio_track_count * 4;
+
+    xmv->current_stream = 0;
+    if (!xmv->video.frame_count) {
+        xmv->video.frame_count = 1;
+        xmv->current_stream    = 1;
+    }
+
+    /* Packet audio header */
+
+    for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
+        XMVAudioPacket *packet = &xmv->audio[audio_track];
+
+        if (avio_read(pb, data, 4) != 4)
+            return AVERROR(EIO);
+
+        packet->data_size = AV_RL32(data) & 0x007FFFFF;
+        if ((packet->data_size == 0) && (audio_track != 0))
+            /* This happens when I create an XMV with several identical audio
+             * streams. From the size calculations, duplicating the previous
+             * stream's size works out, but the track data itself is silent.
+             * Maybe this should also redirect the offset to the previous track?
+             */
+            packet->data_size = xmv->audio[audio_track - 1].data_size;
+
+        /** Carve up the audio data in frame_count slices */
+        packet->frame_size  = packet->data_size  / xmv->video.frame_count;
+        packet->frame_size -= packet->frame_size % packet->track->block_align;
+    }
+
+    /* Packet data offsets */
+
+    data_offset = avio_tell(pb);
+
+    xmv->video.data_offset = data_offset;
+    data_offset += xmv->video.data_size;
+
+    for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
+        xmv->audio[audio_track].data_offset = data_offset;
+        data_offset += xmv->audio[audio_track].data_size;
+    }
+
+    /* Video frames header */
+
+    /* Read new video extra data */
+    if (xmv->video.data_size > 0) {
+        if (xmv->video.has_extradata) {
+            xmv_read_extradata(xmv->video.extradata, pb);
+
+            xmv->video.data_size   -= 4;
+            xmv->video.data_offset += 4;
+
+            if (xmv->video.stream_index >= 0) {
+                AVStream *vst = s->streams[xmv->video.stream_index];
+
+                assert(xmv->video.stream_index < s->nb_streams);
+
+                if (vst->codec->extradata_size < 4) {
+                    av_free(vst->codec->extradata);
+
+                    vst->codec->extradata =
+                        av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
+                    vst->codec->extradata_size = 4;
+                }
+
+                memcpy(vst->codec->extradata, xmv->video.extradata, 4);
+            }
+        }
+    }
+
+    return 0;
+}
+
+static int xmv_fetch_new_packet(AVFormatContext *s)
+{
+    XMVDemuxContext *xmv = s->priv_data;
+    AVIOContext     *pb  = s->pb;
+    int result;
+
+    /* Seek to it */
+    xmv->this_packet_offset = xmv->next_packet_offset;
+    if (avio_seek(pb, xmv->this_packet_offset, SEEK_SET) != xmv->this_packet_offset)
+        return AVERROR(EIO);
+
+    /* Update the size */
+    xmv->this_packet_size = xmv->next_packet_size;
+    if (xmv->this_packet_size < (12 + xmv->audio_track_count * 4))
+        return AVERROR(EIO);
+
+    /* Process the header */
+    result = xmv_process_packet_header(s);
+    if (result)
+        return result;
+
+    /* Update the offset */
+    xmv->next_packet_offset = xmv->this_packet_offset + xmv->this_packet_size;
+
+    return 0;
+}
+
+static int xmv_fetch_audio_packet(AVFormatContext *s,
+                                  AVPacket *pkt, uint32_t stream)
+{
+    XMVDemuxContext *xmv   = s->priv_data;
+    AVIOContext     *pb    = s->pb;
+    XMVAudioPacket  *audio = &xmv->audio[stream];
+
+    uint32_t data_size;
+    uint32_t block_count;
+    int result;
+
+    /* Seek to it */
+    if (avio_seek(pb, audio->data_offset, SEEK_SET) != audio->data_offset)
+        return AVERROR(EIO);
+
+    if ((xmv->video.current_frame + 1) < xmv->video.frame_count)
+        /* Not the last frame, get at most frame_size bytes. */
+        data_size = FFMIN(audio->frame_size, audio->data_size);
+    else
+        /* Last frame, get the rest. */
+        data_size = audio->data_size;
+
+    /* Read the packet */
+    result = av_get_packet(pb, pkt, data_size);
+    if (result <= 0)
+        return result;
+
+    pkt->stream_index = audio->stream_index;
+
+    /* Calculate the PTS */
+
+    block_count = data_size / audio->track->block_align;
+
+    pkt->duration = block_count;
+    pkt->pts      = audio->block_count;
+    pkt->dts      = AV_NOPTS_VALUE;
+
+    audio->block_count += block_count;
+
+    /* Advance offset */
+    audio->data_size   -= data_size;
+    audio->data_offset += data_size;
+
+    return 0;
+}
+
+static int xmv_fetch_video_packet(AVFormatContext *s,
+                                  AVPacket *pkt)
+{
+    XMVDemuxContext *xmv   = s->priv_data;
+    AVIOContext     *pb    = s->pb;
+    XMVVideoPacket  *video = &xmv->video;
+
+    int result;
+    uint32_t frame_header;
+    uint32_t frame_size, frame_timestamp;
+    uint32_t i;
+
+    /* Seek to it */
+    if (avio_seek(pb, video->data_offset, SEEK_SET) != video->data_offset)
+        return AVERROR(EIO);
+
+    /* Read the frame header */
+    frame_header = avio_rl32(pb);
+
+    frame_size      = (frame_header & 0x1FFFF) * 4 + 4;
+    frame_timestamp = (frame_header >> 17);
+
+    if ((frame_size + 4) > video->data_size)
+        return AVERROR(EIO);
+
+    /* Create the packet */
+    result = av_new_packet(pkt, frame_size);
+    if (result)
+        return result;
+
+    /* Contrary to normal WMV2 video, the bit stream in XMV's
+     * WMV2 is little-endian.
+     * TODO: This manual swap is of course suboptimal.
+     */
+    for (i = 0; i < frame_size; i += 4)
+        AV_WB32(pkt->data + i, avio_rl32(pb));
+
+    pkt->stream_index = video->stream_index;
+
+    /* Calculate the PTS */
+
+    video->last_pts = frame_timestamp + video->pts;
+
+    pkt->duration = 0;
+    pkt->pts      = video->last_pts;
+    pkt->dts      = AV_NOPTS_VALUE;
+
+    video->pts += frame_timestamp;
+
+    /* Keyframe? */
+    pkt->flags = (pkt->data[0] & 0x80) ? 0 : AV_PKT_FLAG_KEY;
+
+    /* Advance offset */
+    video->data_size   -= frame_size + 4;
+    video->data_offset += frame_size + 4;
+
+    return 0;
+}
+
+static int xmv_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    XMVDemuxContext *xmv = s->priv_data;
+    int result;
+
+    if (xmv->video.current_frame == xmv->video.frame_count) {
+        /* No frames left in this packet, so we fetch a new one */
+
+        result = xmv_fetch_new_packet(s);
+        if (result)
+            return result;
+    }
+
+    if (xmv->current_stream == 0) {
+        /* Fetch a video frame */
+
+        result = xmv_fetch_video_packet(s, pkt);
+        if (result)
+            return result;
+
+    } else {
+        /* Fetch an audio frame */
+
+        result = xmv_fetch_audio_packet(s, pkt, xmv->current_stream - 1);
+        if (result)
+            return result;
+    }
+
+    /* Increase our counters */
+    if (++xmv->current_stream >= xmv->stream_count) {
+        xmv->current_stream       = 0;
+        xmv->video.current_frame += 1;
+    }
+
+    return 0;
+}
+
+static int xmv_read_close(AVFormatContext *s)
+{
+    XMVDemuxContext *xmv = s->priv_data;
+
+    av_free(xmv->audio);
+    av_free(xmv->audio_tracks);
+
+    return 0;
+}
+
+AVInputFormat ff_xmv_demuxer = {
+    .name           = "xmv",
+    .long_name      = NULL_IF_CONFIG_SMALL("Microsoft XMV"),
+    .priv_data_size = sizeof(XMVDemuxContext),
+    .read_probe     = xmv_probe,
+    .read_header    = xmv_read_header,
+    .read_packet    = xmv_read_packet,
+    .read_close     = xmv_read_close,
+};