diff options
Diffstat (limited to 'libavformat/xmv.c')
| -rw-r--r-- | libavformat/xmv.c | 188 |
1 files changed, 92 insertions, 96 deletions
diff --git a/libavformat/xmv.c b/libavformat/xmv.c index 5041c57..f250aad 100644 --- a/libavformat/xmv.c +++ b/libavformat/xmv.c @@ -3,20 +3,20 @@ * Copyright (c) 2011 Sven Hesse <drmccoy@drmccoy.de> * Copyright (c) 2011 Matthew Hoops <clone2727@gmail.com> * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -32,81 +32,79 @@ #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) -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 AVCodecID codec_id; -} XMVAudioTrack; - +/** A video packet with an XMV file. */ typedef struct XMVVideoPacket { - /* The decoder stream index for this video packet. */ - int stream_index; + int stream_index; ///< The decoder stream index for this video packet. - uint32_t data_size; - uint32_t data_offset; + 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; - uint32_t frame_count; + uint32_t current_frame; ///< The current frame within this video packet. + uint32_t frame_count; ///< The amount of frames within this video packet. - /* Does the video packet contain extra data? */ - int has_extradata; + int has_extradata; ///< Does the video packet contain extra data? + uint8_t extradata[4]; ///< The extra data - /* Extra data */ - uint8_t extradata[4]; - - int64_t last_pts; - int64_t pts; + 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 { - /* The decoder stream index for this audio packet. */ - int stream_index; + int stream_index; ///< The decoder stream index for this audio packet. - /* The audio track this packet encodes. */ - XMVAudioTrack *track; + /* 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 + uint16_t block_align; ///< Bytes per compressed block. + uint16_t block_samples; ///< Decompressed samples per compressed block. - uint32_t data_size; - uint32_t data_offset; + enum AVCodecID codec_id; ///< The codec ID of the compression scheme. - uint32_t frame_size; + 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 block_count; + 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; + uint16_t audio_track_count; ///< Number of audio track in this file. - XMVAudioTrack *audio_tracks; - - uint32_t this_packet_size; - uint32_t next_packet_size; + uint32_t this_packet_size; ///< Size of the current packet. + uint32_t next_packet_size; ///< Size of the next packet. - uint32_t this_packet_offset; - uint32_t next_packet_offset; + uint64_t this_packet_offset; ///< Offset of the current packet. + uint64_t next_packet_offset; ///< Offset of the next packet. - uint16_t current_stream; - uint16_t stream_count; + uint16_t current_stream; ///< The index of the stream currently handling. + uint16_t stream_count; ///< The number of streams in this file. - XMVVideoPacket video; - XMVAudioPacket *audio; + 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) @@ -172,34 +170,33 @@ static int xmv_read_header(AVFormatContext *s) 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]; + 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->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; @@ -207,24 +204,24 @@ static int xmv_read_header(AVFormatContext *s) /* 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) + if (packet->flags & XMV_AUDIO_ADPCM51) av_log(s, AV_LOG_WARNING, "Unsupported 5.1 ADPCM audio stream " - "(0x%04X)\n", track->flags); + "(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 = 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; + 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, track->block_samples, track->sample_rate); + avpriv_set_pts_info(ast, 32, packet->block_samples, packet->sample_rate); packet->stream_index = ast->index; @@ -232,7 +229,7 @@ static int xmv_read_header(AVFormatContext *s) } - /** Initialize the packet context */ + /* Initialize the packet context */ xmv->next_packet_offset = avio_tell(pb); xmv->next_packet_size = this_packet_size - xmv->next_packet_offset; @@ -277,7 +274,7 @@ static int xmv_process_packet_header(AVFormatContext *s) uint8_t data[8]; uint16_t audio_track; - uint32_t data_offset; + uint64_t data_offset; /* Next packet size */ xmv->next_packet_size = avio_rl32(pb); @@ -298,7 +295,7 @@ static int xmv_process_packet_header(AVFormatContext *s) * 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 + * 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... @@ -308,7 +305,7 @@ static int xmv_process_packet_header(AVFormatContext *s) xmv->current_stream = 0; if (!xmv->video.frame_count) { xmv->video.frame_count = 1; - xmv->current_stream = 1; + xmv->current_stream = xmv->stream_count > 1; } /* Packet audio header */ @@ -328,9 +325,9 @@ static int xmv_process_packet_header(AVFormatContext *s) */ packet->data_size = xmv->audio[audio_track - 1].data_size; - /** Carve up the audio data in frame_count slices */ + /* 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->frame_size -= packet->frame_size % packet->block_align; } /* Packet data offsets */ @@ -358,7 +355,7 @@ static int xmv_process_packet_header(AVFormatContext *s) if (xmv->video.stream_index >= 0) { AVStream *vst = s->streams[xmv->video.stream_index]; - assert(xmv->video.stream_index < s->nb_streams); + av_assert0(xmv->video.stream_index < s->nb_streams); if (vst->codec->extradata_size < 4) { av_free(vst->codec->extradata); @@ -434,7 +431,7 @@ static int xmv_fetch_audio_packet(AVFormatContext *s, /* Calculate the PTS */ - block_count = data_size / audio->track->block_align; + block_count = data_size / audio->block_align; pkt->duration = block_count; pkt->pts = audio->block_count; @@ -459,7 +456,7 @@ static int xmv_fetch_video_packet(AVFormatContext *s, int result; uint32_t frame_header; uint32_t frame_size, frame_timestamp; - uint32_t i; + uint8_t *data, *end; /* Seek to it */ if (avio_seek(pb, video->data_offset, SEEK_SET) != video->data_offset) @@ -474,17 +471,17 @@ static int xmv_fetch_video_packet(AVFormatContext *s, if ((frame_size + 4) > video->data_size) return AVERROR(EIO); - /* Create the packet */ - result = av_new_packet(pkt, frame_size); - if (result) + /* 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 (i = 0; i < frame_size; i += 4) - AV_WB32(pkt->data + i, avio_rl32(pb)); + 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; @@ -550,8 +547,7 @@ static int xmv_read_close(AVFormatContext *s) { XMVDemuxContext *xmv = s->priv_data; - av_free(xmv->audio); - av_free(xmv->audio_tracks); + av_freep(&xmv->audio); return 0; } |
