diff options
author | Mike Melanson <mike@multimedia.cx> | 2003-10-03 05:43:03 +0000 |
---|---|---|
committer | Mike Melanson <mike@multimedia.cx> | 2003-10-03 05:43:03 +0000 |
commit | 4120a53a868cc99e66121c625981050deed50443 (patch) | |
tree | fa9b522869d8dea38b6349d37049b5207d36a4ce | |
parent | a686caf03ddd29b32abd1af5c6f887bc09e6d71b (diff) | |
download | ffmpeg-4120a53a868cc99e66121c625981050deed50443.tar.gz |
implemented Id Quake II CIN support
Originally committed as revision 2339 to svn://svn.ffmpeg.org/ffmpeg/trunk
-rw-r--r-- | Changelog | 1 | ||||
-rw-r--r-- | doc/ffmpeg-doc.texi | 4 | ||||
-rw-r--r-- | libavcodec/Makefile | 2 | ||||
-rw-r--r-- | libavcodec/allcodecs.c | 1 | ||||
-rw-r--r-- | libavcodec/avcodec.h | 2 | ||||
-rw-r--r-- | libavcodec/idcinvideo.c | 278 | ||||
-rw-r--r-- | libavformat/Makefile | 2 | ||||
-rw-r--r-- | libavformat/allformats.c | 1 | ||||
-rw-r--r-- | libavformat/avformat.h | 3 | ||||
-rw-r--r-- | libavformat/idcin.c | 313 |
10 files changed, 605 insertions, 2 deletions
@@ -6,6 +6,7 @@ version <next>: - Cinepak decoder - Sega FILM (CPK) file demuxer - Westwood multimedia support (VQA/AUD file demuxer, audio decoder) +- Id Quake II CIN playback support version 0.4.8: diff --git a/doc/ffmpeg-doc.texi b/doc/ffmpeg-doc.texi index 5bfaa8f4c4..c5ace0be0b 100644 --- a/doc/ffmpeg-doc.texi +++ b/doc/ffmpeg-doc.texi @@ -633,6 +633,8 @@ library: @tab used in many Sega Saturn console games @item Westwood Studios VQA/AUD @tab @tab X @tab Multimedia formats used in Westwood Studios games +@item Id Cinematic (.cin) @tab @tab X +@tab Used in Quake II @end multitable @code{X} means that the encoding (resp. decoding) is supported. @@ -692,6 +694,8 @@ following image formats are supported: @item Cinepak @tab @tab X @item Microsoft RLE @tab @tab X @item Microsoft Video-1 @tab @tab X +@item Westwood VQA @tab @tab X +@item Id Cinematic Video @tab @tab X @tab used in Quake II @end multitable @code{X} means that the encoding (resp. decoding) is supported. diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 03501532bc..6da467dcac 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -18,7 +18,7 @@ OBJS= common.o utils.o mem.o allcodecs.o \ fft.o mdct.o mace.o huffyuv.o cyuv.o opts.o raw.o h264.o golomb.o \ vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o cljr.o \ roqvideo.o dpcm.o interplayvideo.o xan.o rpza.o cinepak.o msrle.o \ - msvideo1.o vqavideo.o + msvideo1.o vqavideo.o idcinvideo.o ifeq ($(AMR_NB),yes) ifeq ($(AMR_NB_FIXED),yes) diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index 10dacf8db5..ea4ae601d8 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -128,6 +128,7 @@ void avcodec_register_all(void) register_avcodec(&msrle_decoder); register_avcodec(&msvideo1_decoder); register_avcodec(&vqa_decoder); + register_avcodec(&idcin_decoder); #ifdef CONFIG_AC3 register_avcodec(&ac3_decoder); #endif diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h index c2d3943898..32227f4932 100644 --- a/libavcodec/avcodec.h +++ b/libavcodec/avcodec.h @@ -79,6 +79,7 @@ enum CodecID { CODEC_ID_WS_VQA, CODEC_ID_MSRLE, CODEC_ID_MSVIDEO1, + CODEC_ID_IDCIN, /* various pcm "codecs" */ CODEC_ID_PCM_S16LE, @@ -1433,6 +1434,7 @@ extern AVCodec cinepak_decoder; extern AVCodec msrle_decoder; extern AVCodec msvideo1_decoder; extern AVCodec vqa_decoder; +extern AVCodec idcin_decoder; extern AVCodec ra_144_decoder; extern AVCodec ra_288_decoder; extern AVCodec roq_dpcm_decoder; diff --git a/libavcodec/idcinvideo.c b/libavcodec/idcinvideo.c new file mode 100644 index 0000000000..2a6ae360f8 --- /dev/null +++ b/libavcodec/idcinvideo.c @@ -0,0 +1,278 @@ +/* + * Id Quake II CIN Video Decoder + * Copyright (C) 2003 the ffmpeg project + * + * This library 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 of the License, or (at your option) any later version. + * + * This library 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 this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +/** + * @file idcinvideo.c + * Id Quake II Cin Video Decoder by Dr. Tim Ferguson + * For more information about the Id CIN format, visit: + * http://www.csse.monash.edu.au/~timf/ + * + * This video decoder outputs PAL8 colorspace data. + * + * Id CIN video is purely Huffman-coded, intraframe-only codec. It achieves + * a little more compression by exploiting the fact that adjacent pixels + * tend to be similar. + * + * Note that this decoder could use ffmpeg's optimized VLC facilities + * rather than naive, tree-based Huffman decoding. However, there are 256 + * Huffman tables. Plus, the VLC bit coding order is right -> left instead + * or left -> right, so all of the bits would have to be reversed. Further, + * the original Quake II implementation likely used a similar naive + * decoding algorithm and it worked fine on much lower spec machines. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "common.h" +#include "avcodec.h" +#include "dsputil.h" + +#define HUFFMAN_TABLE_SIZE 64 * 1024 +#define HUF_TOKENS 256 +#define PALETTE_COUNT 256 + +typedef struct +{ + int count; + unsigned char used; + int children[2]; +} hnode_t; + +typedef struct IdcinContext { + + AVCodecContext *avctx; + DSPContext dsp; + AVFrame frame; + + unsigned char *buf; + int size; + + unsigned char palette[PALETTE_COUNT * 4]; + + hnode_t huff_nodes[256][HUF_TOKENS*2]; + int num_huff_nodes[256]; + +} IdcinContext; + +/* + * Find the lowest probability node in a Huffman table, and mark it as + * being assigned to a higher probability. + * Returns the node index of the lowest unused node, or -1 if all nodes + * are used. + */ +static int huff_smallest_node(hnode_t *hnodes, int num_hnodes) { + int i; + int best, best_node; + + best = 99999999; + best_node = -1; + for(i = 0; i < num_hnodes; i++) { + if(hnodes[i].used) + continue; + if(!hnodes[i].count) + continue; + if(hnodes[i].count < best) { + best = hnodes[i].count; + best_node = i; + } + } + + if(best_node == -1) + return -1; + hnodes[best_node].used = 1; + return best_node; +} + +/* + * Build the Huffman tree using the generated/loaded probabilities histogram. + * + * On completion: + * huff_nodes[prev][i < HUF_TOKENS] - are the nodes at the base of the tree. + * huff_nodes[prev][i >= HUF_TOKENS] - are used to construct the tree. + * num_huff_nodes[prev] - contains the index to the root node of the tree. + * That is: huff_nodes[prev][num_huff_nodes[prev]] is the root node. + */ +static void huff_build_tree(IdcinContext *s, int prev) { + hnode_t *node, *hnodes; + int num_hnodes, i; + + num_hnodes = HUF_TOKENS; + hnodes = s->huff_nodes[prev]; + for(i = 0; i < HUF_TOKENS * 2; i++) + hnodes[i].used = 0; + + while (1) { + node = &hnodes[num_hnodes]; /* next free node */ + + /* pick two lowest counts */ + node->children[0] = huff_smallest_node(hnodes, num_hnodes); + if(node->children[0] == -1) + break; /* reached the root node */ + + node->children[1] = huff_smallest_node(hnodes, num_hnodes); + if(node->children[1] == -1) + break; /* reached the root node */ + + /* combine nodes probability for new node */ + node->count = hnodes[node->children[0]].count + + hnodes[node->children[1]].count; + num_hnodes++; + } + + s->num_huff_nodes[prev] = num_hnodes - 1; +} + +static int idcin_decode_init(AVCodecContext *avctx) +{ + IdcinContext *s = (IdcinContext *)avctx->priv_data; + int i, j, histogram_index = 0; + unsigned char *histograms; + + s->avctx = avctx; + avctx->pix_fmt = PIX_FMT_PAL8; + avctx->has_b_frames = 0; + dsputil_init(&s->dsp, avctx); + + /* make sure the Huffman tables make it */ + if (s->avctx->extradata_size != HUFFMAN_TABLE_SIZE) { + printf(" Id CIN video: expected extradata size of %d\n", HUFFMAN_TABLE_SIZE); + return -1; + } + + /* build the 256 Huffman decode trees */ + histograms = (unsigned char *)s->avctx->extradata; + for (i = 0; i < 256; i++) { + for(j = 0; j < HUF_TOKENS; j++) + s->huff_nodes[i][j].count = histograms[histogram_index++]; + huff_build_tree(s, i); + } + + s->frame.data[0] = NULL; + + return 0; +} + +static void idcin_decode_vlcs(IdcinContext *s) +{ + hnode_t *hnodes; + long x, y; + int prev; + unsigned char v = 0; + int bit_pos, node_num, dat_pos; + + prev = bit_pos = dat_pos = 0; + for (y = 0; y < (s->frame.linesize[0] * s->avctx->height); + y += s->frame.linesize[0]) { + for (x = y; x < y + s->avctx->width; x++) { + node_num = s->num_huff_nodes[prev]; + hnodes = s->huff_nodes[prev]; + + while(node_num >= HUF_TOKENS) { + if(!bit_pos) { + if(dat_pos > s->size) { + printf("Huffman decode error.\n"); + return; + } + bit_pos = 8; + v = s->buf[dat_pos++]; + } + + node_num = hnodes[node_num].children[v & 0x01]; + v = v >> 1; + bit_pos--; + } + + s->frame.data[0][x] = node_num; + prev = node_num; + } + } +} + +static int idcin_decode_frame(AVCodecContext *avctx, + void *data, int *data_size, + uint8_t *buf, int buf_size) +{ + IdcinContext *s = (IdcinContext *)avctx->priv_data; + AVPaletteControl *palette_control = + (AVPaletteControl *)avctx->extradata; + int i; + unsigned int *palette32; + int palette_index = 0; + unsigned char r, g, b; + + s->buf = buf; + s->size = buf_size; + + if (palette_control->palette_changed) { + palette32 = (unsigned int *)s->palette; + for (i = 0; i < PALETTE_COUNT; i++) { + r = palette_control->palette[palette_index++] * 1; + g = palette_control->palette[palette_index++] * 1; + b = palette_control->palette[palette_index++] * 1; + palette32[i] = (r << 16) | (g << 8) | (b); + } + palette_control->palette_changed = 0; + } + + if (s->frame.data[0]) + avctx->release_buffer(avctx, &s->frame); + + if (avctx->get_buffer(avctx, &s->frame)) { + printf (" Id CIN Video: get_buffer() failed\n"); + return -1; + } + + idcin_decode_vlcs(s); + + /* make the palette available on the way out */ + memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4); + + *data_size = sizeof(AVFrame); + *(AVFrame*)data = s->frame; + + /* report that the buffer was completely consumed */ + return buf_size; +} + +static int idcin_decode_end(AVCodecContext *avctx) +{ + IdcinContext *s = (IdcinContext *)avctx->priv_data; + + if (s->frame.data[0]) + avctx->release_buffer(avctx, &s->frame); + + return 0; +} + +AVCodec idcin_decoder = { + "idcinvideo", + CODEC_TYPE_VIDEO, + CODEC_ID_IDCIN, + sizeof(IdcinContext), + idcin_decode_init, + NULL, + idcin_decode_end, + idcin_decode_frame, + CODEC_CAP_DR1, +}; + diff --git a/libavformat/Makefile b/libavformat/Makefile index 7057a7a8a3..de385a53c5 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -15,7 +15,7 @@ PPOBJS= OBJS+=mpeg.o mpegts.o mpegtsenc.o ffm.o crc.o img.o raw.o rm.o \ avienc.o avidec.o wav.o swf.o au.o gif.o mov.o mpjpeg.o dv.o \ yuv4mpeg.o 4xm.o flvenc.o flvdec.o movenc.o psxstr.o idroq.o ipmovie.o \ - nut.o wc3movie.o mp3.o westwood.o segafilm.o + nut.o wc3movie.o mp3.o westwood.o segafilm.o idcin.o ifeq ($(CONFIG_RISKY),yes) OBJS+= asf.o diff --git a/libavformat/allformats.c b/libavformat/allformats.c index ba42483eeb..2367c47910 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -58,6 +58,7 @@ void av_register_all(void) wc3_init(); westwood_init(); film_init(); + idcin_init(); #if defined(AMR_NB) || defined(AMR_NB_FIXED) || defined(AMR_WB) amr_init(); diff --git a/libavformat/avformat.h b/libavformat/avformat.h index 3ca8979f87..7de9c8ee3c 100644 --- a/libavformat/avformat.h +++ b/libavformat/avformat.h @@ -412,6 +412,9 @@ int westwood_init(void); /* segafilm.c */ int film_init(void); +/* idcin.c */ +int idcin_init(void); + #include "rtp.h" #include "rtsp.h" diff --git a/libavformat/idcin.c b/libavformat/idcin.c new file mode 100644 index 0000000000..6125c64afc --- /dev/null +++ b/libavformat/idcin.c @@ -0,0 +1,313 @@ +/* + * Id Quake II CIN File Demuxer + * Copyright (c) 2003 The ffmpeg Project + * + * This library 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 of the License, or (at your option) any later version. + * + * This library 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 this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0]) +#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \ + (((uint8_t*)(x))[2] << 16) | \ + (((uint8_t*)(x))[1] << 8) | \ + ((uint8_t*)(x))[0]) + +#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; + + /* keep reference to extradata but never free it */ + void *extradata; +} 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 = LE_32(&p->buf[0]); + if ((number == 0) || (number > 1024)) + return 0; + + /* check the video height */ + number = LE_32(&p->buf[4]); + if ((number == 0) || (number > 1024)) + return 0; + + /* check the audio sample rate */ + number = LE_32(&p->buf[8]); + if ((number != 0) && ((number < 8000) | (number > 48000))) + return 0; + + /* check the audio bytes/sample */ + number = LE_32(&p->buf[12]); + if (number > 2) + return 0; + + /* check the audio channels */ + number = LE_32(&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; + 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 -EIO; + /* save a reference in order to transport the palette */ + idcin->extradata = st->codec.extradata; + + /* 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; + 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; + + /* set the pts reference (1 pts = 1/90000) */ + s->pts_num = 1; + s->pts_den = 90000; + + 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; + AVPaletteControl *palette_control = (AVPaletteControl *)idcin->extradata; + int i; + int palette_scale; + + if (url_feof(&s->pb)) + return -EIO; + + if (idcin->next_chunk_is_video) { + command = get_le32(pb); + if (command == 2) { + return -EIO; + } else if (command == 1) { + /* trigger a palette change */ + palette_control->palette_changed = 1; + if (get_buffer(pb, palette_control->palette, 768) != 768) + return -EIO; + /* scale the palette as necessary */ + palette_scale = 2; + for (i = 0; i < 768; i++) + if (palette_control->palette[i] > 63) { + palette_scale = 0; + break; + } + + if (palette_scale) + for (i = 0; i < 768; i++) + palette_control->palette[i] <<= palette_scale; + } + + 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; + if (av_new_packet(pkt, chunk_size)) + ret = -EIO; + pkt->stream_index = idcin->video_stream_index; + pkt->pts = idcin->pts; + ret = get_buffer(pb, pkt->data, chunk_size); + if (ret != chunk_size) + ret = -EIO; + } else { + /* send out the audio chunk */ + if (idcin->current_audio_chunk) + chunk_size = idcin->audio_chunk_size2; + else + chunk_size = idcin->audio_chunk_size1; + if (av_new_packet(pkt, chunk_size)) + return -EIO; + pkt->stream_index = idcin->audio_stream_index; + pkt->pts = idcin->pts; + ret = get_buffer(&s->pb, pkt->data, chunk_size); + if (ret != chunk_size) + ret = -EIO; + + 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; +} + +static AVInputFormat idcin_iformat = { + "idcin", + "Id CIN format", + sizeof(IdcinDemuxContext), + idcin_probe, + idcin_read_header, + idcin_read_packet, + idcin_read_close, +}; + +int idcin_init(void) +{ + av_register_input_format(&idcin_iformat); + return 0; +} |