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Diffstat (limited to 'ffmpeg1/libavformat/idcin.c')
| -rw-r--r-- | ffmpeg1/libavformat/idcin.c | 380 |
1 files changed, 0 insertions, 380 deletions
diff --git a/ffmpeg1/libavformat/idcin.c b/ffmpeg1/libavformat/idcin.c deleted file mode 100644 index 2a8af40..0000000 --- a/ffmpeg1/libavformat/idcin.c +++ /dev/null @@ -1,380 +0,0 @@ -/* - * id Quake II CIN File Demuxer - * Copyright (c) 2003 The ffmpeg Project - * - * 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 - * id Quake II CIN file demuxer by Mike Melanson (melanson@pcisys.net) - * For more information about the id CIN format, visit: - * http://www.csse.monash.edu.au/~timf/ - * - * CIN is a somewhat quirky and ill-defined format. Here are some notes - * for anyone trying to understand the technical details of this format: - * - * The format has no definite file signature. This is problematic for a - * general-purpose media player that wants to automatically detect file - * types. However, a CIN file does start with 5 32-bit numbers that - * specify audio and video parameters. This demuxer gets around the lack - * of file signature by performing sanity checks on those parameters. - * Probabalistically, this is a reasonable solution since the number of - * valid combinations of the 5 parameters is a very small subset of the - * total 160-bit number space. - * - * Refer to the function idcin_probe() for the precise A/V parameters - * that this demuxer allows. - * - * Next, each audio and video frame has a duration of 1/14 sec. If the - * audio sample rate is a multiple of the common frequency 22050 Hz it will - * divide evenly by 14. However, if the sample rate is 11025 Hz: - * 11025 (samples/sec) / 14 (frames/sec) = 787.5 (samples/frame) - * The way the CIN stores audio in this case is by storing 787 sample - * frames in the first audio frame and 788 sample frames in the second - * audio frame. Therefore, the total number of bytes in an audio frame - * is given as: - * audio frame #0: 787 * (bytes/sample) * (# channels) bytes in frame - * audio frame #1: 788 * (bytes/sample) * (# channels) bytes in frame - * audio frame #2: 787 * (bytes/sample) * (# channels) bytes in frame - * audio frame #3: 788 * (bytes/sample) * (# channels) bytes in frame - * - * Finally, not all id CIN creation tools agree on the resolution of the - * color palette, apparently. Some creation tools specify red, green, and - * blue palette components in terms of 6-bit VGA color DAC values which - * range from 0..63. Other tools specify the RGB components as full 8-bit - * values that range from 0..255. Since there are no markers in the file to - * differentiate between the two variants, this demuxer uses the following - * heuristic: - * - load the 768 palette bytes from disk - * - assume that they will need to be shifted left by 2 bits to - * transform them from 6-bit values to 8-bit values - * - scan through all 768 palette bytes - * - if any bytes exceed 63, do not shift the bytes at all before - * transmitting them to the video decoder - */ - -#include "libavutil/channel_layout.h" -#include "libavutil/imgutils.h" -#include "libavutil/intreadwrite.h" -#include "avformat.h" -#include "internal.h" - -#define HUFFMAN_TABLE_SIZE (64 * 1024) -#define IDCIN_FPS 14 - -typedef struct IdcinDemuxContext { - int video_stream_index; - int audio_stream_index; - int audio_chunk_size1; - int audio_chunk_size2; - int block_align; - - /* demux state variables */ - int current_audio_chunk; - int next_chunk_is_video; - int audio_present; - int64_t first_pkt_pos; -} IdcinDemuxContext; - -static int idcin_probe(AVProbeData *p) -{ - unsigned int number; - - /* - * This is what you could call a "probabilistic" file check: id CIN - * files don't have a definite file signature. In lieu of such a marker, - * perform sanity checks on the 5 32-bit header fields: - * width, height: greater than 0, less than or equal to 1024 - * audio sample rate: greater than or equal to 8000, less than or - * equal to 48000, or 0 for no audio - * audio sample width (bytes/sample): 0 for no audio, or 1 or 2 - * audio channels: 0 for no audio, or 1 or 2 - */ - - /* check we have enough data to do all checks, otherwise the - 0-padding may cause a wrong recognition */ - if (p->buf_size < 20) - return 0; - - /* check the video width */ - number = AV_RL32(&p->buf[0]); - if ((number == 0) || (number > 1024)) - return 0; - - /* check the video height */ - number = AV_RL32(&p->buf[4]); - if ((number == 0) || (number > 1024)) - return 0; - - /* check the audio sample rate */ - number = AV_RL32(&p->buf[8]); - if ((number != 0) && ((number < 8000) | (number > 48000))) - return 0; - - /* check the audio bytes/sample */ - number = AV_RL32(&p->buf[12]); - if (number > 2) - return 0; - - /* check the audio channels */ - number = AV_RL32(&p->buf[16]); - if (number > 2) - return 0; - - /* return half certainly since this check is a bit sketchy */ - return AVPROBE_SCORE_MAX / 2; -} - -static int idcin_read_header(AVFormatContext *s) -{ - AVIOContext *pb = s->pb; - IdcinDemuxContext *idcin = s->priv_data; - AVStream *st; - unsigned int width, height; - unsigned int sample_rate, bytes_per_sample, channels; - int ret; - - /* get the 5 header parameters */ - width = avio_rl32(pb); - height = avio_rl32(pb); - sample_rate = avio_rl32(pb); - bytes_per_sample = avio_rl32(pb); - channels = avio_rl32(pb); - - if (s->pb->eof_reached) { - av_log(s, AV_LOG_ERROR, "incomplete header\n"); - return s->pb->error ? s->pb->error : AVERROR_EOF; - } - - if (av_image_check_size(width, height, 0, s) < 0) - return AVERROR_INVALIDDATA; - if (sample_rate > 0) { - if (sample_rate < 14 || sample_rate > INT_MAX) { - av_log(s, AV_LOG_ERROR, "invalid sample rate: %u\n", sample_rate); - return AVERROR_INVALIDDATA; - } - if (bytes_per_sample < 1 || bytes_per_sample > 2) { - av_log(s, AV_LOG_ERROR, "invalid bytes per sample: %u\n", - bytes_per_sample); - return AVERROR_INVALIDDATA; - } - if (channels < 1 || channels > 2) { - av_log(s, AV_LOG_ERROR, "invalid channels: %u\n", channels); - return AVERROR_INVALIDDATA; - } - idcin->audio_present = 1; - } else { - /* if sample rate is 0, assume no audio */ - idcin->audio_present = 0; - } - - st = avformat_new_stream(s, NULL); - if (!st) - return AVERROR(ENOMEM); - avpriv_set_pts_info(st, 33, 1, IDCIN_FPS); - st->start_time = 0; - idcin->video_stream_index = st->index; - st->codec->codec_type = AVMEDIA_TYPE_VIDEO; - st->codec->codec_id = AV_CODEC_ID_IDCIN; - st->codec->codec_tag = 0; /* no fourcc */ - st->codec->width = width; - st->codec->height = height; - - /* load up the Huffman tables into extradata */ - st->codec->extradata_size = HUFFMAN_TABLE_SIZE; - st->codec->extradata = av_malloc(HUFFMAN_TABLE_SIZE); - ret = avio_read(pb, st->codec->extradata, HUFFMAN_TABLE_SIZE); - if (ret < 0) { - return ret; - } else if (ret != HUFFMAN_TABLE_SIZE) { - av_log(s, AV_LOG_ERROR, "incomplete header\n"); - return AVERROR(EIO); - } - - if (idcin->audio_present) { - idcin->audio_present = 1; - st = avformat_new_stream(s, NULL); - if (!st) - return AVERROR(ENOMEM); - avpriv_set_pts_info(st, 63, 1, sample_rate); - st->start_time = 0; - idcin->audio_stream_index = st->index; - st->codec->codec_type = AVMEDIA_TYPE_AUDIO; - st->codec->codec_tag = 1; - st->codec->channels = channels; - st->codec->channel_layout = channels > 1 ? AV_CH_LAYOUT_STEREO : - AV_CH_LAYOUT_MONO; - st->codec->sample_rate = sample_rate; - st->codec->bits_per_coded_sample = bytes_per_sample * 8; - st->codec->bit_rate = sample_rate * bytes_per_sample * 8 * channels; - st->codec->block_align = idcin->block_align = bytes_per_sample * channels; - if (bytes_per_sample == 1) - st->codec->codec_id = AV_CODEC_ID_PCM_U8; - else - st->codec->codec_id = AV_CODEC_ID_PCM_S16LE; - - if (sample_rate % 14 != 0) { - idcin->audio_chunk_size1 = (sample_rate / 14) * - bytes_per_sample * channels; - idcin->audio_chunk_size2 = (sample_rate / 14 + 1) * - bytes_per_sample * channels; - } else { - idcin->audio_chunk_size1 = idcin->audio_chunk_size2 = - (sample_rate / 14) * bytes_per_sample * channels; - } - idcin->current_audio_chunk = 0; - } - - idcin->next_chunk_is_video = 1; - idcin->first_pkt_pos = avio_tell(s->pb); - - return 0; -} - -static int idcin_read_packet(AVFormatContext *s, - AVPacket *pkt) -{ - int ret; - unsigned int command; - unsigned int chunk_size; - IdcinDemuxContext *idcin = s->priv_data; - AVIOContext *pb = s->pb; - int i; - int palette_scale; - unsigned char r, g, b; - unsigned char palette_buffer[768]; - uint32_t palette[256]; - - if (url_feof(s->pb)) - return s->pb->error ? s->pb->error : AVERROR_EOF; - - if (idcin->next_chunk_is_video) { - command = avio_rl32(pb); - if (command == 2) { - return AVERROR(EIO); - } else if (command == 1) { - /* trigger a palette change */ - ret = avio_read(pb, palette_buffer, 768); - if (ret < 0) { - return ret; - } else if (ret != 768) { - av_log(s, AV_LOG_ERROR, "incomplete packet\n"); - return AVERROR(EIO); - } - /* scale the palette as necessary */ - palette_scale = 2; - for (i = 0; i < 768; i++) - if (palette_buffer[i] > 63) { - palette_scale = 0; - break; - } - - for (i = 0; i < 256; i++) { - r = palette_buffer[i * 3 ] << palette_scale; - g = palette_buffer[i * 3 + 1] << palette_scale; - b = palette_buffer[i * 3 + 2] << palette_scale; - palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | (b); - if (palette_scale == 2) - palette[i] |= palette[i] >> 6 & 0x30303; - } - } - - if (s->pb->eof_reached) { - av_log(s, AV_LOG_ERROR, "incomplete packet\n"); - return s->pb->error ? s->pb->error : AVERROR_EOF; - } - chunk_size = avio_rl32(pb); - if (chunk_size < 4 || chunk_size > INT_MAX - 4) { - av_log(s, AV_LOG_ERROR, "invalid chunk size: %u\n", chunk_size); - return AVERROR_INVALIDDATA; - } - /* skip the number of decoded bytes (always equal to width * height) */ - avio_skip(pb, 4); - if (chunk_size < 4) - return AVERROR_INVALIDDATA; - chunk_size -= 4; - ret= av_get_packet(pb, pkt, chunk_size); - if (ret < 0) - return ret; - else if (ret != chunk_size) { - av_log(s, AV_LOG_ERROR, "incomplete packet\n"); - av_free_packet(pkt); - return AVERROR(EIO); - } - if (command == 1) { - uint8_t *pal; - - pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, - AVPALETTE_SIZE); - if (!pal) { - av_free_packet(pkt); - return AVERROR(ENOMEM); - } - memcpy(pal, palette, AVPALETTE_SIZE); - pkt->flags |= AV_PKT_FLAG_KEY; - } - pkt->stream_index = idcin->video_stream_index; - pkt->duration = 1; - } else { - /* send out the audio chunk */ - if (idcin->current_audio_chunk) - chunk_size = idcin->audio_chunk_size2; - else - chunk_size = idcin->audio_chunk_size1; - ret= av_get_packet(pb, pkt, chunk_size); - if (ret < 0) - return ret; - pkt->stream_index = idcin->audio_stream_index; - pkt->duration = chunk_size / idcin->block_align; - - idcin->current_audio_chunk ^= 1; - } - - if (idcin->audio_present) - idcin->next_chunk_is_video ^= 1; - - return 0; -} - -static int idcin_read_seek(AVFormatContext *s, int stream_index, - int64_t timestamp, int flags) -{ - IdcinDemuxContext *idcin = s->priv_data; - - if (idcin->first_pkt_pos > 0) { - int ret = avio_seek(s->pb, idcin->first_pkt_pos, SEEK_SET); - if (ret < 0) - return ret; - ff_update_cur_dts(s, s->streams[idcin->video_stream_index], 0); - idcin->next_chunk_is_video = 1; - idcin->current_audio_chunk = 0; - return 0; - } - return -1; -} - -AVInputFormat ff_idcin_demuxer = { - .name = "idcin", - .long_name = NULL_IF_CONFIG_SMALL("id Cinematic"), - .priv_data_size = sizeof(IdcinDemuxContext), - .read_probe = idcin_probe, - .read_header = idcin_read_header, - .read_packet = idcin_read_packet, - .read_seek = idcin_read_seek, - .flags = AVFMT_NO_BYTE_SEEK, -}; |