| /* |
| * Microsoft XMV demuxer |
| * Copyright (c) 2011 Sven Hesse <drmccoy@drmccoy.de> |
| * Copyright (c) 2011 Matthew Hoops <clone2727@gmail.com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Microsoft XMV demuxer |
| */ |
| |
| #include <inttypes.h> |
| |
| #include "libavutil/intreadwrite.h" |
| |
| #include "avformat.h" |
| #include "internal.h" |
| #include "riff.h" |
| #include "libavutil/avassert.h" |
| |
| /** The min size of an XMV header. */ |
| #define XMV_MIN_HEADER_SIZE 36 |
| |
| /** Audio flag: ADPCM'd 5.1 stream, front left / right channels */ |
| #define XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT 1 |
| /** Audio flag: ADPCM'd 5.1 stream, front center / low frequency channels */ |
| #define XMV_AUDIO_ADPCM51_FRONTCENTERLOW 2 |
| /** Audio flag: ADPCM'd 5.1 stream, rear left / right channels */ |
| #define XMV_AUDIO_ADPCM51_REARLEFTRIGHT 4 |
| |
| /** Audio flag: Any of the ADPCM'd 5.1 stream flags. */ |
| #define XMV_AUDIO_ADPCM51 (XMV_AUDIO_ADPCM51_FRONTLEFTRIGHT | \ |
| XMV_AUDIO_ADPCM51_FRONTCENTERLOW | \ |
| XMV_AUDIO_ADPCM51_REARLEFTRIGHT) |
| |
| #define XMV_BLOCK_ALIGN_SIZE 36 |
| |
| /** A video packet with an XMV file. */ |
| typedef struct XMVVideoPacket { |
| int created; |
| int stream_index; ///< The decoder stream index for this video packet. |
| |
| uint32_t data_size; ///< The size of the remaining video data. |
| uint64_t data_offset; ///< The offset of the video data within the file. |
| |
| uint32_t current_frame; ///< The current frame within this video packet. |
| uint32_t frame_count; ///< The amount of frames within this video packet. |
| |
| int has_extradata; ///< Does the video packet contain extra data? |
| uint8_t extradata[4]; ///< The extra data |
| |
| int64_t last_pts; ///< PTS of the last video frame. |
| int64_t pts; ///< PTS of the most current video frame. |
| } XMVVideoPacket; |
| |
| /** An audio packet with an XMV file. */ |
| typedef struct XMVAudioPacket { |
| int created; |
| int stream_index; ///< The decoder stream index for this audio packet. |
| |
| /* Stream format properties. */ |
| uint16_t compression; ///< The type of compression. |
| uint16_t channels; ///< Number of channels. |
| int32_t sample_rate; ///< Sampling rate. |
| uint16_t bits_per_sample; ///< Bits per compressed sample. |
| uint32_t bit_rate; ///< Bits of compressed data per second. |
| uint16_t flags; ///< Flags |
| unsigned block_align; ///< Bytes per compressed block. |
| uint16_t block_samples; ///< Decompressed samples per compressed block. |
| |
| enum AVCodecID codec_id; ///< The codec ID of the compression scheme. |
| |
| uint32_t data_size; ///< The size of the remaining audio data. |
| uint64_t data_offset; ///< The offset of the audio data within the file. |
| |
| uint32_t frame_size; ///< Number of bytes to put into an audio frame. |
| |
| uint64_t block_count; ///< Running counter of decompressed audio block. |
| } XMVAudioPacket; |
| |
| /** Context for demuxing an XMV file. */ |
| typedef struct XMVDemuxContext { |
| uint16_t audio_track_count; ///< Number of audio track in this file. |
| |
| uint32_t this_packet_size; ///< Size of the current packet. |
| uint32_t next_packet_size; ///< Size of the next packet. |
| |
| uint64_t this_packet_offset; ///< Offset of the current packet. |
| uint64_t next_packet_offset; ///< Offset of the next packet. |
| |
| uint16_t current_stream; ///< The index of the stream currently handling. |
| uint16_t stream_count; ///< The number of streams in this file. |
| |
| uint32_t video_duration; |
| uint32_t video_width; |
| uint32_t video_height; |
| |
| XMVVideoPacket video; ///< The video packet contained in each packet. |
| XMVAudioPacket *audio; ///< The audio packets contained in each packet. |
| } 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_close(AVFormatContext *s) |
| { |
| XMVDemuxContext *xmv = s->priv_data; |
| |
| av_freep(&xmv->audio); |
| |
| return 0; |
| } |
| |
| static int xmv_read_header(AVFormatContext *s) |
| { |
| XMVDemuxContext *xmv = s->priv_data; |
| AVIOContext *pb = s->pb; |
| |
| uint32_t file_version; |
| uint32_t this_packet_size; |
| uint16_t audio_track; |
| int ret; |
| |
| s->ctx_flags |= AVFMTCTX_NOHEADER; |
| |
| 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)) |
| avpriv_request_sample(s, "Uncommon version %"PRIu32"", file_version); |
| |
| /* Video tracks */ |
| |
| xmv->video_width = avio_rl32(pb); |
| xmv->video_height = avio_rl32(pb); |
| xmv->video_duration = avio_rl32(pb); |
| |
| /* Audio tracks */ |
| |
| xmv->audio_track_count = avio_rl16(pb); |
| |
| avio_skip(pb, 2); /* Unknown (padding?) */ |
| |
| xmv->audio = av_mallocz_array(xmv->audio_track_count, sizeof(XMVAudioPacket)); |
| if (!xmv->audio) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| |
| for (audio_track = 0; audio_track < xmv->audio_track_count; audio_track++) { |
| XMVAudioPacket *packet = &xmv->audio[audio_track]; |
| |
| packet->compression = avio_rl16(pb); |
| packet->channels = avio_rl16(pb); |
| packet->sample_rate = avio_rl32(pb); |
| packet->bits_per_sample = avio_rl16(pb); |
| packet->flags = avio_rl16(pb); |
| |
| packet->bit_rate = packet->bits_per_sample * |
| packet->sample_rate * |
| packet->channels; |
| packet->block_align = XMV_BLOCK_ALIGN_SIZE * packet->channels; |
| packet->block_samples = 64; |
| packet->codec_id = ff_wav_codec_get_id(packet->compression, |
| packet->bits_per_sample); |
| |
| 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 (packet->flags & XMV_AUDIO_ADPCM51) |
| av_log(s, AV_LOG_WARNING, "Unsupported 5.1 ADPCM audio stream " |
| "(0x%04X)\n", packet->flags); |
| |
| if (!packet->channels || packet->sample_rate <= 0 || |
| packet->channels >= UINT16_MAX / XMV_BLOCK_ALIGN_SIZE) { |
| av_log(s, AV_LOG_ERROR, "Invalid parameters for audio track %"PRIu16".\n", |
| audio_track); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| } |
| |
| |
| /* Initialize the packet context */ |
| |
| xmv->next_packet_offset = avio_tell(pb); |
| xmv->next_packet_size = this_packet_size - xmv->next_packet_offset; |
| xmv->stream_count = xmv->audio_track_count + 1; |
| |
| return 0; |
| |
| fail: |
| xmv_read_close(s); |
| return ret; |
| } |
| |
| 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; |
| int ret; |
| |
| uint8_t data[8]; |
| uint16_t audio_track; |
| uint64_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; |
| |
| if (!xmv->video.created) { |
| AVStream *vst = avformat_new_stream(s, NULL); |
| if (!vst) |
| return AVERROR(ENOMEM); |
| |
| avpriv_set_pts_info(vst, 32, 1, 1000); |
| |
| vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| vst->codecpar->codec_id = AV_CODEC_ID_WMV2; |
| vst->codecpar->codec_tag = MKBETAG('W', 'M', 'V', '2'); |
| vst->codecpar->width = xmv->video_width; |
| vst->codecpar->height = xmv->video_height; |
| |
| vst->duration = xmv->video_duration; |
| |
| xmv->video.stream_index = vst->index; |
| |
| xmv->video.created = 1; |
| } |
| |
| /* 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). Subtracting 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 = xmv->stream_count > 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); |
| |
| if (!packet->created) { |
| AVStream *ast = avformat_new_stream(s, NULL); |
| if (!ast) |
| return AVERROR(ENOMEM); |
| |
| ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| ast->codecpar->codec_id = packet->codec_id; |
| ast->codecpar->codec_tag = packet->compression; |
| ast->codecpar->channels = packet->channels; |
| ast->codecpar->sample_rate = packet->sample_rate; |
| ast->codecpar->bits_per_coded_sample = packet->bits_per_sample; |
| ast->codecpar->bit_rate = packet->bit_rate; |
| ast->codecpar->block_align = 36 * packet->channels; |
| |
| avpriv_set_pts_info(ast, 32, packet->block_samples, packet->sample_rate); |
| |
| packet->stream_index = ast->index; |
| |
| ast->duration = xmv->video_duration; |
| |
| packet->created = 1; |
| } |
| |
| 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->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]; |
| |
| av_assert0(xmv->video.stream_index < s->nb_streams); |
| |
| if (vst->codecpar->extradata_size < 4) { |
| av_freep(&vst->codecpar->extradata); |
| |
| if ((ret = ff_alloc_extradata(vst->codecpar, 4)) < 0) |
| return ret; |
| } |
| |
| memcpy(vst->codecpar->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; |
| |
| if (xmv->this_packet_offset == xmv->next_packet_offset) |
| return AVERROR_EOF; |
| |
| /* 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->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; |
| uint8_t *data, *end; |
| |
| /* 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); |
| |
| /* 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, |
| }; |