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-rw-r--r--contrib/ffmpeg/libavformat/idcin.c301
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diff --git a/contrib/ffmpeg/libavformat/idcin.c b/contrib/ffmpeg/libavformat/idcin.c
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-/*
- * 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 idcin.c
- * 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 "avformat.h"
-
-#define HUFFMAN_TABLE_SIZE (64 * 1024)
-#define FRAME_PTS_INC (90000 / 14)
-
-typedef struct IdcinDemuxContext {
- int video_stream_index;
- int audio_stream_index;
- int audio_chunk_size1;
- int audio_chunk_size2;
-
- /* demux state variables */
- int current_audio_chunk;
- int next_chunk_is_video;
- int audio_present;
-
- int64_t pts;
-
- AVPaletteControl palctrl;
-} 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
- */
-
- /* cannot proceed without 20 bytes */
- 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,
- AVFormatParameters *ap)
-{
- ByteIOContext *pb = &s->pb;
- IdcinDemuxContext *idcin = (IdcinDemuxContext *)s->priv_data;
- AVStream *st;
- unsigned int width, height;
- unsigned int sample_rate, bytes_per_sample, channels;
-
- /* get the 5 header parameters */
- width = get_le32(pb);
- height = get_le32(pb);
- sample_rate = get_le32(pb);
- bytes_per_sample = get_le32(pb);
- channels = get_le32(pb);
-
- st = av_new_stream(s, 0);
- if (!st)
- return AVERROR_NOMEM;
- av_set_pts_info(st, 33, 1, 90000);
- idcin->video_stream_index = st->index;
- st->codec->codec_type = CODEC_TYPE_VIDEO;
- st->codec->codec_id = 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);
- if (get_buffer(pb, st->codec->extradata, HUFFMAN_TABLE_SIZE) !=
- HUFFMAN_TABLE_SIZE)
- return AVERROR_IO;
- /* save a reference in order to transport the palette */
- st->codec->palctrl = &idcin->palctrl;
-
- /* if sample rate is 0, assume no audio */
- if (sample_rate) {
- idcin->audio_present = 1;
- st = av_new_stream(s, 0);
- if (!st)
- return AVERROR_NOMEM;
- av_set_pts_info(st, 33, 1, 90000);
- idcin->audio_stream_index = st->index;
- st->codec->codec_type = CODEC_TYPE_AUDIO;
- st->codec->codec_tag = 1;
- st->codec->channels = channels;
- st->codec->sample_rate = sample_rate;
- st->codec->bits_per_sample = bytes_per_sample * 8;
- st->codec->bit_rate = sample_rate * bytes_per_sample * 8 * channels;
- st->codec->block_align = bytes_per_sample * channels;
- if (bytes_per_sample == 1)
- st->codec->codec_id = CODEC_ID_PCM_U8;
- else
- st->codec->codec_id = 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;
- } else
- idcin->audio_present = 1;
-
- idcin->next_chunk_is_video = 1;
- idcin->pts = 0;
-
- return 0;
-}
-
-static int idcin_read_packet(AVFormatContext *s,
- AVPacket *pkt)
-{
- int ret;
- unsigned int command;
- unsigned int chunk_size;
- IdcinDemuxContext *idcin = (IdcinDemuxContext *)s->priv_data;
- ByteIOContext *pb = &s->pb;
- int i;
- int palette_scale;
- unsigned char r, g, b;
- unsigned char palette_buffer[768];
-
- if (url_feof(&s->pb))
- return AVERROR_IO;
-
- if (idcin->next_chunk_is_video) {
- command = get_le32(pb);
- if (command == 2) {
- return AVERROR_IO;
- } else if (command == 1) {
- /* trigger a palette change */
- idcin->palctrl.palette_changed = 1;
- if (get_buffer(pb, palette_buffer, 768) != 768)
- return AVERROR_IO;
- /* 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;
- idcin->palctrl.palette[i] = (r << 16) | (g << 8) | (b);
- }
- }
-
- chunk_size = get_le32(pb);
- /* skip the number of decoded bytes (always equal to width * height) */
- url_fseek(pb, 4, SEEK_CUR);
- chunk_size -= 4;
- ret= av_get_packet(pb, pkt, chunk_size);
- if (ret != chunk_size)
- return AVERROR_IO;
- pkt->stream_index = idcin->video_stream_index;
- pkt->pts = idcin->pts;
- } 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 != chunk_size)
- return AVERROR_IO;
- pkt->stream_index = idcin->audio_stream_index;
- pkt->pts = idcin->pts;
-
- idcin->current_audio_chunk ^= 1;
- idcin->pts += FRAME_PTS_INC;
- }
-
- if (idcin->audio_present)
- idcin->next_chunk_is_video ^= 1;
-
- return ret;
-}
-
-static int idcin_read_close(AVFormatContext *s)
-{
-
- return 0;
-}
-
-AVInputFormat idcin_demuxer = {
- "idcin",
- "Id CIN format",
- sizeof(IdcinDemuxContext),
- idcin_probe,
- idcin_read_header,
- idcin_read_packet,
- idcin_read_close,
-};
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