yading@11: /* yading@11: * Microsoft XMV demuxer yading@11: * Copyright (c) 2011 Sven Hesse yading@11: * Copyright (c) 2011 Matthew Hoops yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: /** yading@11: * @file yading@11: * Microsoft XMV demuxer yading@11: */ yading@11: yading@11: #include yading@11: yading@11: #include "libavutil/intreadwrite.h" yading@11: yading@11: #include "avformat.h" yading@11: #include "internal.h" yading@11: #include "riff.h" yading@11: #include "libavutil/avassert.h" yading@11: yading@11: /** The min size of an XMV header. */ yading@11: #define XMV_MIN_HEADER_SIZE 36 yading@11: yading@11: /** Audio flag: ADPCM'd 5.1 stream, front left / right channels */ yading@11: #define XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT 1 yading@11: /** Audio flag: ADPCM'd 5.1 stream, front center / low frequency channels */ yading@11: #define XMV_AUDIO_ADPCM51_FRONTCENTERLOW 2 yading@11: /** Audio flag: ADPCM'd 5.1 stream, rear left / right channels */ yading@11: #define XMV_AUDIO_ADPCM51_REARLEFTRIGHT 4 yading@11: yading@11: /** Audio flag: Any of the ADPCM'd 5.1 stream flags. */ yading@11: #define XMV_AUDIO_ADPCM51 (XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT | \ yading@11: XMV_AUDIO_ADPCM51_FRONTCENTERLOW | \ yading@11: XMV_AUDIO_ADPCM51_REARLEFTRIGHT) yading@11: yading@11: /** A video packet with an XMV file. */ yading@11: typedef struct XMVVideoPacket { yading@11: int stream_index; ///< The decoder stream index for this video packet. yading@11: yading@11: uint32_t data_size; ///< The size of the remaining video data. yading@11: uint64_t data_offset; ///< The offset of the video data within the file. yading@11: yading@11: uint32_t current_frame; ///< The current frame within this video packet. yading@11: uint32_t frame_count; ///< The amount of frames within this video packet. yading@11: yading@11: int has_extradata; ///< Does the video packet contain extra data? yading@11: uint8_t extradata[4]; ///< The extra data yading@11: yading@11: int64_t last_pts; ///< PTS of the last video frame. yading@11: int64_t pts; ///< PTS of the most current video frame. yading@11: } XMVVideoPacket; yading@11: yading@11: /** An audio packet with an XMV file. */ yading@11: typedef struct XMVAudioPacket { yading@11: int stream_index; ///< The decoder stream index for this audio packet. yading@11: yading@11: /* Stream format properties. */ yading@11: uint16_t compression; ///< The type of compression. yading@11: uint16_t channels; ///< Number of channels. yading@11: uint32_t sample_rate; ///< Sampling rate. yading@11: uint16_t bits_per_sample; ///< Bits per compressed sample. yading@11: uint32_t bit_rate; ///< Bits of compressed data per second. yading@11: uint16_t flags; ///< Flags yading@11: unsigned block_align; ///< Bytes per compressed block. yading@11: uint16_t block_samples; ///< Decompressed samples per compressed block. yading@11: yading@11: enum AVCodecID codec_id; ///< The codec ID of the compression scheme. yading@11: yading@11: uint32_t data_size; ///< The size of the remaining audio data. yading@11: uint64_t data_offset; ///< The offset of the audio data within the file. yading@11: yading@11: uint32_t frame_size; ///< Number of bytes to put into an audio frame. yading@11: yading@11: uint64_t block_count; ///< Running counter of decompressed audio block. yading@11: } XMVAudioPacket; yading@11: yading@11: /** Context for demuxing an XMV file. */ yading@11: typedef struct XMVDemuxContext { yading@11: uint16_t audio_track_count; ///< Number of audio track in this file. yading@11: yading@11: uint32_t this_packet_size; ///< Size of the current packet. yading@11: uint32_t next_packet_size; ///< Size of the next packet. yading@11: yading@11: uint64_t this_packet_offset; ///< Offset of the current packet. yading@11: uint64_t next_packet_offset; ///< Offset of the next packet. yading@11: yading@11: uint16_t current_stream; ///< The index of the stream currently handling. yading@11: uint16_t stream_count; ///< The number of streams in this file. yading@11: yading@11: XMVVideoPacket video; ///< The video packet contained in each packet. yading@11: XMVAudioPacket *audio; ///< The audio packets contained in each packet. yading@11: } XMVDemuxContext; yading@11: yading@11: static int xmv_probe(AVProbeData *p) yading@11: { yading@11: uint32_t file_version; yading@11: yading@11: if (p->buf_size < XMV_MIN_HEADER_SIZE) yading@11: return 0; yading@11: yading@11: file_version = AV_RL32(p->buf + 16); yading@11: if ((file_version == 0) || (file_version > 4)) yading@11: return 0; yading@11: yading@11: if (!memcmp(p->buf + 12, "xobX", 4)) yading@11: return AVPROBE_SCORE_MAX; yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static int xmv_read_close(AVFormatContext *s) yading@11: { yading@11: XMVDemuxContext *xmv = s->priv_data; yading@11: yading@11: av_freep(&xmv->audio); yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static int xmv_read_header(AVFormatContext *s) yading@11: { yading@11: XMVDemuxContext *xmv = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: AVStream *vst = NULL; yading@11: yading@11: uint32_t file_version; yading@11: uint32_t this_packet_size; yading@11: uint16_t audio_track; yading@11: int ret; yading@11: yading@11: avio_skip(pb, 4); /* Next packet size */ yading@11: yading@11: this_packet_size = avio_rl32(pb); yading@11: yading@11: avio_skip(pb, 4); /* Max packet size */ yading@11: avio_skip(pb, 4); /* "xobX" */ yading@11: yading@11: file_version = avio_rl32(pb); yading@11: if ((file_version != 4) && (file_version != 2)) yading@11: avpriv_request_sample(s, "Uncommon version %d", file_version); yading@11: yading@11: yading@11: /* Video track */ yading@11: yading@11: vst = avformat_new_stream(s, NULL); yading@11: if (!vst) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: avpriv_set_pts_info(vst, 32, 1, 1000); yading@11: yading@11: vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; yading@11: vst->codec->codec_id = AV_CODEC_ID_WMV2; yading@11: vst->codec->codec_tag = MKBETAG('W', 'M', 'V', '2'); yading@11: vst->codec->width = avio_rl32(pb); yading@11: vst->codec->height = avio_rl32(pb); yading@11: yading@11: vst->duration = avio_rl32(pb); yading@11: yading@11: xmv->video.stream_index = vst->index; yading@11: yading@11: /* Audio tracks */ yading@11: yading@11: xmv->audio_track_count = avio_rl16(pb); yading@11: yading@11: avio_skip(pb, 2); /* Unknown (padding?) */ yading@11: yading@11: xmv->audio = av_malloc(xmv->audio_track_count * sizeof(XMVAudioPacket)); yading@11: if (!xmv->audio) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: yading@11: for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) { yading@11: XMVAudioPacket *packet = &xmv->audio[audio_track]; yading@11: AVStream *ast = NULL; yading@11: yading@11: packet->compression = avio_rl16(pb); yading@11: packet->channels = avio_rl16(pb); yading@11: packet->sample_rate = avio_rl32(pb); yading@11: packet->bits_per_sample = avio_rl16(pb); yading@11: packet->flags = avio_rl16(pb); yading@11: yading@11: packet->bit_rate = packet->bits_per_sample * yading@11: packet->sample_rate * yading@11: packet->channels; yading@11: packet->block_align = 36 * packet->channels; yading@11: packet->block_samples = 64; yading@11: packet->codec_id = ff_wav_codec_get_id(packet->compression, yading@11: packet->bits_per_sample); yading@11: yading@11: packet->stream_index = -1; yading@11: yading@11: packet->frame_size = 0; yading@11: packet->block_count = 0; yading@11: yading@11: /* TODO: ADPCM'd 5.1 sound is encoded in three separate streams. yading@11: * Those need to be interleaved to a proper 5.1 stream. */ yading@11: if (packet->flags & XMV_AUDIO_ADPCM51) yading@11: av_log(s, AV_LOG_WARNING, "Unsupported 5.1 ADPCM audio stream " yading@11: "(0x%04X)\n", packet->flags); yading@11: yading@11: if (!packet->channels || !packet->sample_rate) { yading@11: av_log(s, AV_LOG_ERROR, "Invalid parameters for audio track %d.\n", yading@11: audio_track); yading@11: ret = AVERROR_INVALIDDATA; yading@11: goto fail; yading@11: } yading@11: yading@11: ast = avformat_new_stream(s, NULL); yading@11: if (!ast) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: yading@11: ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; yading@11: ast->codec->codec_id = packet->codec_id; yading@11: ast->codec->codec_tag = packet->compression; yading@11: ast->codec->channels = packet->channels; yading@11: ast->codec->sample_rate = packet->sample_rate; yading@11: ast->codec->bits_per_coded_sample = packet->bits_per_sample; yading@11: ast->codec->bit_rate = packet->bit_rate; yading@11: ast->codec->block_align = 36 * packet->channels; yading@11: yading@11: avpriv_set_pts_info(ast, 32, packet->block_samples, packet->sample_rate); yading@11: yading@11: packet->stream_index = ast->index; yading@11: yading@11: ast->duration = vst->duration; yading@11: } yading@11: yading@11: yading@11: /* Initialize the packet context */ yading@11: yading@11: xmv->next_packet_offset = avio_tell(pb); yading@11: xmv->next_packet_size = this_packet_size - xmv->next_packet_offset; yading@11: xmv->stream_count = xmv->audio_track_count + 1; yading@11: yading@11: return 0; yading@11: yading@11: fail: yading@11: xmv_read_close(s); yading@11: return ret; yading@11: } yading@11: yading@11: static void xmv_read_extradata(uint8_t *extradata, AVIOContext *pb) yading@11: { yading@11: /* Read the XMV extradata */ yading@11: yading@11: uint32_t data = avio_rl32(pb); yading@11: yading@11: int mspel_bit = !!(data & 0x01); yading@11: int loop_filter = !!(data & 0x02); yading@11: int abt_flag = !!(data & 0x04); yading@11: int j_type_bit = !!(data & 0x08); yading@11: int top_left_mv_flag = !!(data & 0x10); yading@11: int per_mb_rl_bit = !!(data & 0x20); yading@11: int slice_count = (data >> 6) & 7; yading@11: yading@11: /* Write it back as standard WMV2 extradata */ yading@11: yading@11: data = 0; yading@11: yading@11: data |= mspel_bit << 15; yading@11: data |= loop_filter << 14; yading@11: data |= abt_flag << 13; yading@11: data |= j_type_bit << 12; yading@11: data |= top_left_mv_flag << 11; yading@11: data |= per_mb_rl_bit << 10; yading@11: data |= slice_count << 7; yading@11: yading@11: AV_WB32(extradata, data); yading@11: } yading@11: yading@11: static int xmv_process_packet_header(AVFormatContext *s) yading@11: { yading@11: XMVDemuxContext *xmv = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: yading@11: uint8_t data[8]; yading@11: uint16_t audio_track; yading@11: uint64_t data_offset; yading@11: yading@11: /* Next packet size */ yading@11: xmv->next_packet_size = avio_rl32(pb); yading@11: yading@11: /* Packet video header */ yading@11: yading@11: if (avio_read(pb, data, 8) != 8) yading@11: return AVERROR(EIO); yading@11: yading@11: xmv->video.data_size = AV_RL32(data) & 0x007FFFFF; yading@11: yading@11: xmv->video.current_frame = 0; yading@11: xmv->video.frame_count = (AV_RL32(data) >> 23) & 0xFF; yading@11: yading@11: xmv->video.has_extradata = (data[3] & 0x80) != 0; yading@11: yading@11: /* Adding the audio data sizes and the video data size keeps you 4 bytes yading@11: * short for every audio track. But as playing around with XMV files with yading@11: * ADPCM audio showed, taking the extra 4 bytes from the audio data gives yading@11: * you either completely distorted audio or click (when skipping the yading@11: * remaining 68 bytes of the ADPCM block). Subtracting 4 bytes for every yading@11: * audio track from the video data works at least for the audio. Probably yading@11: * some alignment thing? yading@11: * The video data has (always?) lots of padding, so it should work out... yading@11: */ yading@11: xmv->video.data_size -= xmv->audio_track_count * 4; yading@11: yading@11: xmv->current_stream = 0; yading@11: if (!xmv->video.frame_count) { yading@11: xmv->video.frame_count = 1; yading@11: xmv->current_stream = xmv->stream_count > 1; yading@11: } yading@11: yading@11: /* Packet audio header */ yading@11: yading@11: for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) { yading@11: XMVAudioPacket *packet = &xmv->audio[audio_track]; yading@11: yading@11: if (avio_read(pb, data, 4) != 4) yading@11: return AVERROR(EIO); yading@11: yading@11: packet->data_size = AV_RL32(data) & 0x007FFFFF; yading@11: if ((packet->data_size == 0) && (audio_track != 0)) yading@11: /* This happens when I create an XMV with several identical audio yading@11: * streams. From the size calculations, duplicating the previous yading@11: * stream's size works out, but the track data itself is silent. yading@11: * Maybe this should also redirect the offset to the previous track? yading@11: */ yading@11: packet->data_size = xmv->audio[audio_track - 1].data_size; yading@11: yading@11: /* Carve up the audio data in frame_count slices */ yading@11: packet->frame_size = packet->data_size / xmv->video.frame_count; yading@11: packet->frame_size -= packet->frame_size % packet->block_align; yading@11: } yading@11: yading@11: /* Packet data offsets */ yading@11: yading@11: data_offset = avio_tell(pb); yading@11: yading@11: xmv->video.data_offset = data_offset; yading@11: data_offset += xmv->video.data_size; yading@11: yading@11: for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) { yading@11: xmv->audio[audio_track].data_offset = data_offset; yading@11: data_offset += xmv->audio[audio_track].data_size; yading@11: } yading@11: yading@11: /* Video frames header */ yading@11: yading@11: /* Read new video extra data */ yading@11: if (xmv->video.data_size > 0) { yading@11: if (xmv->video.has_extradata) { yading@11: xmv_read_extradata(xmv->video.extradata, pb); yading@11: yading@11: xmv->video.data_size -= 4; yading@11: xmv->video.data_offset += 4; yading@11: yading@11: if (xmv->video.stream_index >= 0) { yading@11: AVStream *vst = s->streams[xmv->video.stream_index]; yading@11: yading@11: av_assert0(xmv->video.stream_index < s->nb_streams); yading@11: yading@11: if (vst->codec->extradata_size < 4) { yading@11: av_free(vst->codec->extradata); yading@11: yading@11: vst->codec->extradata = yading@11: av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE); yading@11: vst->codec->extradata_size = 4; yading@11: } yading@11: yading@11: memcpy(vst->codec->extradata, xmv->video.extradata, 4); yading@11: } yading@11: } yading@11: } yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static int xmv_fetch_new_packet(AVFormatContext *s) yading@11: { yading@11: XMVDemuxContext *xmv = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: int result; yading@11: yading@11: if (xmv->this_packet_offset == xmv->next_packet_offset) yading@11: return AVERROR_EOF; yading@11: yading@11: /* Seek to it */ yading@11: xmv->this_packet_offset = xmv->next_packet_offset; yading@11: if (avio_seek(pb, xmv->this_packet_offset, SEEK_SET) != xmv->this_packet_offset) yading@11: return AVERROR(EIO); yading@11: yading@11: /* Update the size */ yading@11: xmv->this_packet_size = xmv->next_packet_size; yading@11: if (xmv->this_packet_size < (12 + xmv->audio_track_count * 4)) yading@11: return AVERROR(EIO); yading@11: yading@11: /* Process the header */ yading@11: result = xmv_process_packet_header(s); yading@11: if (result) yading@11: return result; yading@11: yading@11: /* Update the offset */ yading@11: xmv->next_packet_offset = xmv->this_packet_offset + xmv->this_packet_size; yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static int xmv_fetch_audio_packet(AVFormatContext *s, yading@11: AVPacket *pkt, uint32_t stream) yading@11: { yading@11: XMVDemuxContext *xmv = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: XMVAudioPacket *audio = &xmv->audio[stream]; yading@11: yading@11: uint32_t data_size; yading@11: uint32_t block_count; yading@11: int result; yading@11: yading@11: /* Seek to it */ yading@11: if (avio_seek(pb, audio->data_offset, SEEK_SET) != audio->data_offset) yading@11: return AVERROR(EIO); yading@11: yading@11: if ((xmv->video.current_frame + 1) < xmv->video.frame_count) yading@11: /* Not the last frame, get at most frame_size bytes. */ yading@11: data_size = FFMIN(audio->frame_size, audio->data_size); yading@11: else yading@11: /* Last frame, get the rest. */ yading@11: data_size = audio->data_size; yading@11: yading@11: /* Read the packet */ yading@11: result = av_get_packet(pb, pkt, data_size); yading@11: if (result <= 0) yading@11: return result; yading@11: yading@11: pkt->stream_index = audio->stream_index; yading@11: yading@11: /* Calculate the PTS */ yading@11: yading@11: block_count = data_size / audio->block_align; yading@11: yading@11: pkt->duration = block_count; yading@11: pkt->pts = audio->block_count; yading@11: pkt->dts = AV_NOPTS_VALUE; yading@11: yading@11: audio->block_count += block_count; yading@11: yading@11: /* Advance offset */ yading@11: audio->data_size -= data_size; yading@11: audio->data_offset += data_size; yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static int xmv_fetch_video_packet(AVFormatContext *s, yading@11: AVPacket *pkt) yading@11: { yading@11: XMVDemuxContext *xmv = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: XMVVideoPacket *video = &xmv->video; yading@11: yading@11: int result; yading@11: uint32_t frame_header; yading@11: uint32_t frame_size, frame_timestamp; yading@11: uint8_t *data, *end; yading@11: yading@11: /* Seek to it */ yading@11: if (avio_seek(pb, video->data_offset, SEEK_SET) != video->data_offset) yading@11: return AVERROR(EIO); yading@11: yading@11: /* Read the frame header */ yading@11: frame_header = avio_rl32(pb); yading@11: yading@11: frame_size = (frame_header & 0x1FFFF) * 4 + 4; yading@11: frame_timestamp = (frame_header >> 17); yading@11: yading@11: if ((frame_size + 4) > video->data_size) yading@11: return AVERROR(EIO); yading@11: yading@11: /* Get the packet data */ yading@11: result = av_get_packet(pb, pkt, frame_size); yading@11: if (result != frame_size) yading@11: return result; yading@11: yading@11: /* Contrary to normal WMV2 video, the bit stream in XMV's yading@11: * WMV2 is little-endian. yading@11: * TODO: This manual swap is of course suboptimal. yading@11: */ yading@11: for (data = pkt->data, end = pkt->data + frame_size; data < end; data += 4) yading@11: AV_WB32(data, AV_RL32(data)); yading@11: yading@11: pkt->stream_index = video->stream_index; yading@11: yading@11: /* Calculate the PTS */ yading@11: yading@11: video->last_pts = frame_timestamp + video->pts; yading@11: yading@11: pkt->duration = 0; yading@11: pkt->pts = video->last_pts; yading@11: pkt->dts = AV_NOPTS_VALUE; yading@11: yading@11: video->pts += frame_timestamp; yading@11: yading@11: /* Keyframe? */ yading@11: pkt->flags = (pkt->data[0] & 0x80) ? 0 : AV_PKT_FLAG_KEY; yading@11: yading@11: /* Advance offset */ yading@11: video->data_size -= frame_size + 4; yading@11: video->data_offset += frame_size + 4; yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static int xmv_read_packet(AVFormatContext *s, yading@11: AVPacket *pkt) yading@11: { yading@11: XMVDemuxContext *xmv = s->priv_data; yading@11: int result; yading@11: yading@11: if (xmv->video.current_frame == xmv->video.frame_count) { yading@11: /* No frames left in this packet, so we fetch a new one */ yading@11: yading@11: result = xmv_fetch_new_packet(s); yading@11: if (result) yading@11: return result; yading@11: } yading@11: yading@11: if (xmv->current_stream == 0) { yading@11: /* Fetch a video frame */ yading@11: yading@11: result = xmv_fetch_video_packet(s, pkt); yading@11: if (result) yading@11: return result; yading@11: yading@11: } else { yading@11: /* Fetch an audio frame */ yading@11: yading@11: result = xmv_fetch_audio_packet(s, pkt, xmv->current_stream - 1); yading@11: if (result) yading@11: return result; yading@11: } yading@11: yading@11: /* Increase our counters */ yading@11: if (++xmv->current_stream >= xmv->stream_count) { yading@11: xmv->current_stream = 0; yading@11: xmv->video.current_frame += 1; yading@11: } yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: AVInputFormat ff_xmv_demuxer = { yading@11: .name = "xmv", yading@11: .long_name = NULL_IF_CONFIG_SMALL("Microsoft XMV"), yading@11: .priv_data_size = sizeof(XMVDemuxContext), yading@11: .read_probe = xmv_probe, yading@11: .read_header = xmv_read_header, yading@11: .read_packet = xmv_read_packet, yading@11: .read_close = xmv_read_close, yading@11: };