595 lines
18 KiB
C
Executable file
595 lines
18 KiB
C
Executable file
/*
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* Microsoft XMV demuxer
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* Copyright (c) 2011 Sven Hesse <drmccoy@drmccoy.de>
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* Copyright (c) 2011 Matthew Hoops <clone2727@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Microsoft XMV demuxer
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*/
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#include <inttypes.h>
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#include "riff.h"
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#include "libavutil/avassert.h"
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/** The min size of an XMV header. */
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#define XMV_MIN_HEADER_SIZE 36
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/** Audio flag: ADPCM'd 5.1 stream, front left / right channels */
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#define XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT 1
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/** Audio flag: ADPCM'd 5.1 stream, front center / low frequency channels */
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#define XMV_AUDIO_ADPCM51_FRONTCENTERLOW 2
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/** Audio flag: ADPCM'd 5.1 stream, rear left / right channels */
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#define XMV_AUDIO_ADPCM51_REARLEFTRIGHT 4
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/** Audio flag: Any of the ADPCM'd 5.1 stream flags. */
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#define XMV_AUDIO_ADPCM51 (XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT | \
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XMV_AUDIO_ADPCM51_FRONTCENTERLOW | \
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XMV_AUDIO_ADPCM51_REARLEFTRIGHT)
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#define XMV_BLOCK_ALIGN_SIZE 36
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/** A video packet with an XMV file. */
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typedef struct XMVVideoPacket {
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int created;
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int stream_index; ///< The decoder stream index for this video packet.
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uint32_t data_size; ///< The size of the remaining video data.
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uint64_t data_offset; ///< The offset of the video data within the file.
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uint32_t current_frame; ///< The current frame within this video packet.
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uint32_t frame_count; ///< The amount of frames within this video packet.
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int has_extradata; ///< Does the video packet contain extra data?
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uint8_t extradata[4]; ///< The extra data
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int64_t last_pts; ///< PTS of the last video frame.
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int64_t pts; ///< PTS of the most current video frame.
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} XMVVideoPacket;
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/** An audio packet with an XMV file. */
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typedef struct XMVAudioPacket {
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int created;
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int stream_index; ///< The decoder stream index for this audio packet.
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/* Stream format properties. */
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uint16_t compression; ///< The type of compression.
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uint16_t channels; ///< Number of channels.
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int32_t sample_rate; ///< Sampling rate.
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uint16_t bits_per_sample; ///< Bits per compressed sample.
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uint64_t bit_rate; ///< Bits of compressed data per second.
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uint16_t flags; ///< Flags
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unsigned block_align; ///< Bytes per compressed block.
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uint16_t block_samples; ///< Decompressed samples per compressed block.
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enum AVCodecID codec_id; ///< The codec ID of the compression scheme.
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uint32_t data_size; ///< The size of the remaining audio data.
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uint64_t data_offset; ///< The offset of the audio data within the file.
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uint32_t frame_size; ///< Number of bytes to put into an audio frame.
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uint64_t block_count; ///< Running counter of decompressed audio block.
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} XMVAudioPacket;
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/** Context for demuxing an XMV file. */
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typedef struct XMVDemuxContext {
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uint16_t audio_track_count; ///< Number of audio track in this file.
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uint32_t this_packet_size; ///< Size of the current packet.
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uint32_t next_packet_size; ///< Size of the next packet.
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uint64_t this_packet_offset; ///< Offset of the current packet.
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uint64_t next_packet_offset; ///< Offset of the next packet.
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uint16_t current_stream; ///< The index of the stream currently handling.
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uint16_t stream_count; ///< The number of streams in this file.
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uint32_t video_duration;
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uint32_t video_width;
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uint32_t video_height;
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XMVVideoPacket video; ///< The video packet contained in each packet.
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XMVAudioPacket *audio; ///< The audio packets contained in each packet.
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} XMVDemuxContext;
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static int xmv_probe(const AVProbeData *p)
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{
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uint32_t file_version;
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if (p->buf_size < XMV_MIN_HEADER_SIZE)
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return 0;
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file_version = AV_RL32(p->buf + 16);
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if ((file_version == 0) || (file_version > 4))
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return 0;
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if (!memcmp(p->buf + 12, "xobX", 4))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int xmv_read_close(AVFormatContext *s)
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{
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XMVDemuxContext *xmv = s->priv_data;
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av_freep(&xmv->audio);
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return 0;
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}
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static int xmv_read_header(AVFormatContext *s)
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{
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XMVDemuxContext *xmv = s->priv_data;
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AVIOContext *pb = s->pb;
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uint32_t file_version;
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uint32_t this_packet_size;
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uint16_t audio_track;
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int ret;
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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avio_skip(pb, 4); /* Next packet size */
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this_packet_size = avio_rl32(pb);
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avio_skip(pb, 4); /* Max packet size */
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avio_skip(pb, 4); /* "xobX" */
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file_version = avio_rl32(pb);
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if ((file_version != 4) && (file_version != 2))
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avpriv_request_sample(s, "Uncommon version %"PRIu32"", file_version);
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/* Video tracks */
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xmv->video_width = avio_rl32(pb);
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xmv->video_height = avio_rl32(pb);
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xmv->video_duration = avio_rl32(pb);
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/* Audio tracks */
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xmv->audio_track_count = avio_rl16(pb);
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avio_skip(pb, 2); /* Unknown (padding?) */
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xmv->audio = av_mallocz_array(xmv->audio_track_count, sizeof(XMVAudioPacket));
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if (!xmv->audio) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
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XMVAudioPacket *packet = &xmv->audio[audio_track];
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packet->compression = avio_rl16(pb);
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packet->channels = avio_rl16(pb);
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packet->sample_rate = avio_rl32(pb);
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packet->bits_per_sample = avio_rl16(pb);
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packet->flags = avio_rl16(pb);
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packet->bit_rate = (uint64_t)packet->bits_per_sample *
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packet->sample_rate *
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packet->channels;
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packet->block_align = XMV_BLOCK_ALIGN_SIZE * packet->channels;
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packet->block_samples = 64;
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packet->codec_id = ff_wav_codec_get_id(packet->compression,
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packet->bits_per_sample);
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packet->stream_index = -1;
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packet->frame_size = 0;
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packet->block_count = 0;
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/* TODO: ADPCM'd 5.1 sound is encoded in three separate streams.
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* Those need to be interleaved to a proper 5.1 stream. */
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if (packet->flags & XMV_AUDIO_ADPCM51)
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av_log(s, AV_LOG_WARNING, "Unsupported 5.1 ADPCM audio stream "
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"(0x%04X)\n", packet->flags);
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if (!packet->channels || packet->sample_rate <= 0 ||
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packet->channels >= UINT16_MAX / XMV_BLOCK_ALIGN_SIZE) {
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av_log(s, AV_LOG_ERROR, "Invalid parameters for audio track %"PRIu16".\n",
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audio_track);
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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}
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/* Initialize the packet context */
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xmv->next_packet_offset = avio_tell(pb);
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xmv->next_packet_size = this_packet_size - xmv->next_packet_offset;
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xmv->stream_count = xmv->audio_track_count + 1;
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return 0;
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fail:
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xmv_read_close(s);
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return ret;
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}
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static void xmv_read_extradata(uint8_t *extradata, AVIOContext *pb)
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{
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/* Read the XMV extradata */
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uint32_t data = avio_rl32(pb);
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int mspel_bit = !!(data & 0x01);
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int loop_filter = !!(data & 0x02);
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int abt_flag = !!(data & 0x04);
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int j_type_bit = !!(data & 0x08);
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int top_left_mv_flag = !!(data & 0x10);
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int per_mb_rl_bit = !!(data & 0x20);
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int slice_count = (data >> 6) & 7;
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/* Write it back as standard WMV2 extradata */
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data = 0;
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data |= mspel_bit << 15;
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data |= loop_filter << 14;
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data |= abt_flag << 13;
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data |= j_type_bit << 12;
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data |= top_left_mv_flag << 11;
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data |= per_mb_rl_bit << 10;
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data |= slice_count << 7;
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AV_WB32(extradata, data);
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}
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static int xmv_process_packet_header(AVFormatContext *s)
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{
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XMVDemuxContext *xmv = s->priv_data;
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AVIOContext *pb = s->pb;
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int ret;
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uint8_t data[8];
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uint16_t audio_track;
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uint64_t data_offset;
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/* Next packet size */
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xmv->next_packet_size = avio_rl32(pb);
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/* Packet video header */
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if (avio_read(pb, data, 8) != 8)
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return AVERROR(EIO);
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xmv->video.data_size = AV_RL32(data) & 0x007FFFFF;
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xmv->video.current_frame = 0;
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xmv->video.frame_count = (AV_RL32(data) >> 23) & 0xFF;
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xmv->video.has_extradata = (data[3] & 0x80) != 0;
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if (!xmv->video.created) {
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AVStream *vst = avformat_new_stream(s, NULL);
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if (!vst)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(vst, 32, 1, 1000);
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vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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vst->codecpar->codec_id = AV_CODEC_ID_WMV2;
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vst->codecpar->codec_tag = MKBETAG('W', 'M', 'V', '2');
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vst->codecpar->width = xmv->video_width;
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vst->codecpar->height = xmv->video_height;
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vst->duration = xmv->video_duration;
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xmv->video.stream_index = vst->index;
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xmv->video.created = 1;
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}
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/* Adding the audio data sizes and the video data size keeps you 4 bytes
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* short for every audio track. But as playing around with XMV files with
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* ADPCM audio showed, taking the extra 4 bytes from the audio data gives
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* you either completely distorted audio or click (when skipping the
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* remaining 68 bytes of the ADPCM block). Subtracting 4 bytes for every
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* audio track from the video data works at least for the audio. Probably
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* some alignment thing?
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* The video data has (always?) lots of padding, so it should work out...
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*/
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xmv->video.data_size -= xmv->audio_track_count * 4;
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xmv->current_stream = 0;
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if (!xmv->video.frame_count) {
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xmv->video.frame_count = 1;
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xmv->current_stream = xmv->stream_count > 1;
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}
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/* Packet audio header */
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for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
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XMVAudioPacket *packet = &xmv->audio[audio_track];
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if (avio_read(pb, data, 4) != 4)
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return AVERROR(EIO);
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if (!packet->created) {
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AVStream *ast = avformat_new_stream(s, NULL);
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if (!ast)
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return AVERROR(ENOMEM);
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ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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ast->codecpar->codec_id = packet->codec_id;
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ast->codecpar->codec_tag = packet->compression;
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ast->codecpar->channels = packet->channels;
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ast->codecpar->sample_rate = packet->sample_rate;
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ast->codecpar->bits_per_coded_sample = packet->bits_per_sample;
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ast->codecpar->bit_rate = packet->bit_rate;
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ast->codecpar->block_align = 36 * packet->channels;
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avpriv_set_pts_info(ast, 32, packet->block_samples, packet->sample_rate);
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packet->stream_index = ast->index;
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ast->duration = xmv->video_duration;
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packet->created = 1;
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}
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packet->data_size = AV_RL32(data) & 0x007FFFFF;
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if ((packet->data_size == 0) && (audio_track != 0))
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/* This happens when I create an XMV with several identical audio
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* streams. From the size calculations, duplicating the previous
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* stream's size works out, but the track data itself is silent.
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* Maybe this should also redirect the offset to the previous track?
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*/
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packet->data_size = xmv->audio[audio_track - 1].data_size;
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/* Carve up the audio data in frame_count slices */
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packet->frame_size = packet->data_size / xmv->video.frame_count;
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packet->frame_size -= packet->frame_size % packet->block_align;
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}
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/* Packet data offsets */
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data_offset = avio_tell(pb);
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xmv->video.data_offset = data_offset;
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data_offset += xmv->video.data_size;
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for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) {
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xmv->audio[audio_track].data_offset = data_offset;
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data_offset += xmv->audio[audio_track].data_size;
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}
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/* Video frames header */
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/* Read new video extra data */
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if (xmv->video.data_size > 0) {
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if (xmv->video.has_extradata) {
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xmv_read_extradata(xmv->video.extradata, pb);
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xmv->video.data_size -= 4;
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xmv->video.data_offset += 4;
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if (xmv->video.stream_index >= 0) {
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AVStream *vst = s->streams[xmv->video.stream_index];
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av_assert0(xmv->video.stream_index < s->nb_streams);
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if (vst->codecpar->extradata_size < 4) {
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if ((ret = ff_alloc_extradata(vst->codecpar, 4)) < 0)
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return ret;
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}
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memcpy(vst->codecpar->extradata, xmv->video.extradata, 4);
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}
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}
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}
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return 0;
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}
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static int xmv_fetch_new_packet(AVFormatContext *s)
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{
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XMVDemuxContext *xmv = s->priv_data;
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AVIOContext *pb = s->pb;
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int result;
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if (xmv->this_packet_offset == xmv->next_packet_offset)
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return AVERROR_EOF;
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/* Seek to it */
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xmv->this_packet_offset = xmv->next_packet_offset;
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if (avio_seek(pb, xmv->this_packet_offset, SEEK_SET) != xmv->this_packet_offset)
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return AVERROR(EIO);
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/* Update the size */
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xmv->this_packet_size = xmv->next_packet_size;
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if (xmv->this_packet_size < (12 + xmv->audio_track_count * 4))
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return AVERROR(EIO);
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/* Process the header */
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result = xmv_process_packet_header(s);
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if (result)
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return result;
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/* Update the offset */
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xmv->next_packet_offset = xmv->this_packet_offset + xmv->this_packet_size;
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return 0;
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}
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static int xmv_fetch_audio_packet(AVFormatContext *s,
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AVPacket *pkt, uint32_t stream)
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{
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XMVDemuxContext *xmv = s->priv_data;
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AVIOContext *pb = s->pb;
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XMVAudioPacket *audio = &xmv->audio[stream];
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uint32_t data_size;
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uint32_t block_count;
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int result;
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/* Seek to it */
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if (avio_seek(pb, audio->data_offset, SEEK_SET) != audio->data_offset)
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return AVERROR(EIO);
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if ((xmv->video.current_frame + 1) < xmv->video.frame_count)
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/* Not the last frame, get at most frame_size bytes. */
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data_size = FFMIN(audio->frame_size, audio->data_size);
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else
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/* Last frame, get the rest. */
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data_size = audio->data_size;
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/* Read the packet */
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result = av_get_packet(pb, pkt, data_size);
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if (result <= 0)
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return result;
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pkt->stream_index = audio->stream_index;
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/* Calculate the PTS */
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block_count = data_size / audio->block_align;
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pkt->duration = block_count;
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pkt->pts = audio->block_count;
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pkt->dts = AV_NOPTS_VALUE;
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audio->block_count += block_count;
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/* Advance offset */
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audio->data_size -= data_size;
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audio->data_offset += data_size;
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return 0;
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}
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static int xmv_fetch_video_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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XMVDemuxContext *xmv = s->priv_data;
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AVIOContext *pb = s->pb;
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XMVVideoPacket *video = &xmv->video;
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int result;
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uint32_t frame_header;
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uint32_t frame_size, frame_timestamp;
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uint8_t *data, *end;
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/* Seek to it */
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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);
|
|
|
|
/* Get the packet data */
|
|
result = av_get_packet(pb, pkt, frame_size);
|
|
if (result != frame_size)
|
|
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 (data = pkt->data, end = pkt->data + frame_size; data < end; data += 4)
|
|
AV_WB32(data, AV_RL32(data));
|
|
|
|
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);
|
|
} else {
|
|
/* Fetch an audio frame */
|
|
|
|
result = xmv_fetch_audio_packet(s, pkt, xmv->current_stream - 1);
|
|
}
|
|
if (result) {
|
|
xmv->current_stream = 0;
|
|
xmv->video.current_frame = xmv->video.frame_count;
|
|
return result;
|
|
}
|
|
|
|
|
|
/* Increase our counters */
|
|
if (++xmv->current_stream >= xmv->stream_count) {
|
|
xmv->current_stream = 0;
|
|
xmv->video.current_frame += 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_xmv_demuxer = {
|
|
.name = "xmv",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Microsoft XMV"),
|
|
.extensions = "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,
|
|
};
|