diff options
Diffstat (limited to 'ffmpeg1/libavformat/xmv.c')
| -rw-r--r-- | ffmpeg1/libavformat/xmv.c | 566 |
1 files changed, 566 insertions, 0 deletions
diff --git a/ffmpeg1/libavformat/xmv.c b/ffmpeg1/libavformat/xmv.c new file mode 100644 index 0000000..e970477 --- /dev/null +++ b/ffmpeg1/libavformat/xmv.c @@ -0,0 +1,566 @@ +/* + * 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 <stdint.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) + +/** A video packet with an XMV file. */ +typedef struct XMVVideoPacket { + 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 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. + uint32_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. + + 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_header(AVFormatContext *s) +{ + 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)) + avpriv_request_sample(s, "Uncommon version %d", file_version); + + + /* Video track */ + + vst = avformat_new_stream(s, NULL); + if (!vst) + return AVERROR(ENOMEM); + + avpriv_set_pts_info(vst, 32, 1, 1000); + + vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; + vst->codec->codec_id = AV_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 = 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++) { + XMVAudioPacket *packet = &xmv->audio[audio_track]; + AVStream *ast = NULL; + + 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); + + if (!packet->channels) { + av_log(s, AV_LOG_ERROR, "0 channels\n"); + return AVERROR(EINVAL); + } + + packet->bit_rate = packet->bits_per_sample * + packet->sample_rate * + packet->channels; + packet->block_align = 36 * 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); + + ast = avformat_new_stream(s, NULL); + if (!ast) + return AVERROR(ENOMEM); + + ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; + ast->codec->codec_id = packet->codec_id; + ast->codec->codec_tag = packet->compression; + ast->codec->channels = packet->channels; + ast->codec->sample_rate = packet->sample_rate; + ast->codec->bits_per_coded_sample = packet->bits_per_sample; + ast->codec->bit_rate = packet->bit_rate; + ast->codec->block_align = 36 * packet->channels; + + avpriv_set_pts_info(ast, 32, packet->block_samples, packet->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->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; + 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; + + /* 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); + + 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->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; + + 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); + 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_freep(&xmv->audio); + + 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, +}; |