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-rw-r--r--rmenc.c498
1 files changed, 498 insertions, 0 deletions
diff --git a/rmenc.c b/rmenc.c
new file mode 100644
index 0000000000..60a3b2a3ad
--- /dev/null
+++ b/rmenc.c
@@ -0,0 +1,498 @@
+/*
+ * RV 1.0 compatible encoder.
+ * Copyright (c) 2000 Gerard Lantau.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <netinet/in.h>
+#include <string.h>
+#include "mpegenc.h"
+#include "mpegvideo.h"
+
+/* in ms */
+#define BUFFER_DURATION 0
+
+typedef struct {
+ int nb_packets;
+ int packet_total_size;
+ int packet_max_size;
+ /* codec related output */
+ int bit_rate;
+ float frame_rate;
+ int nb_frames; /* current frame number */
+ int total_frames; /* total number of frames */
+ int num;
+ AVEncodeContext *enc;
+} StreamInfo;
+
+typedef struct {
+ StreamInfo streams[2];
+ StreamInfo *audio_stream, *video_stream;
+ int nb_streams;
+ int data_pos; /* position of the data after the header */
+} RMContext;
+
+static void put_long(PutByteContext *s, unsigned int val)
+{
+ put_byte(s, val >> 24);
+ put_byte(s, val >> 16);
+ put_byte(s, val >> 8);
+ put_byte(s, val);
+}
+
+static void put_short(PutByteContext *s, unsigned int val)
+{
+ put_byte(s, val >> 8);
+ put_byte(s, val);
+}
+
+static void put_str(PutByteContext *s, const char *tag)
+{
+ put_short(s,strlen(tag));
+ while (*tag) {
+ put_byte(s, *tag++);
+ }
+}
+
+static void put_str8(PutByteContext *s, const char *tag)
+{
+ put_byte(s, strlen(tag));
+ while (*tag) {
+ put_byte(s, *tag++);
+ }
+}
+
+int find_tag(const char *tag, char *buf, int buf_size, const char *str)
+{
+ int len = strlen(tag);
+ char *q;
+
+ buf[0] = '\0';
+ while (*str) {
+ if (*str == '+' && !strncmp(str + 1, tag, len) && str[len+1] == '=') {
+ str += len + 2;
+ q = buf;
+ while (*str && *str != '+' && (q - buf) < (buf_size - 1)) {
+ *q++ = *str++;
+ }
+ /* remove trailing spaces */
+ while (q > buf && q[-1] == ' ') q--;
+ *q = '\0';
+ return 1;
+ }
+ str++;
+ }
+ return 0;
+}
+
+static void rv10_write_header(AVFormatContext *ctx,
+ int data_size, int index_pos)
+{
+ RMContext *rm = ctx->priv_data;
+ PutByteContext *s = &ctx->pb;
+ StreamInfo *stream;
+ unsigned char *data_offset_ptr, *start_ptr;
+ char title[1024], author[1024], copyright[1024], comment[1024];
+ const char *desc, *mimetype;
+ int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
+ int bit_rate, v, duration, flags, data_pos;
+
+ start_ptr = s->buf_ptr;
+
+ put_tag(s, ".RMF");
+ put_long(s,18); /* header size */
+ put_short(s,0);
+ put_long(s,0);
+ put_long(s,4 + rm->nb_streams); /* num headers */
+
+ put_tag(s,"PROP");
+ put_long(s, 50);
+ put_short(s, 0);
+ packet_max_size = 0;
+ packet_total_size = 0;
+ nb_packets = 0;
+ bit_rate = 0;
+ duration = 0;
+ for(i=0;i<rm->nb_streams;i++) {
+ StreamInfo *stream = &rm->streams[i];
+ bit_rate += stream->bit_rate;
+ if (stream->packet_max_size > packet_max_size)
+ packet_max_size = stream->packet_max_size;
+ nb_packets += stream->nb_packets;
+ packet_total_size += stream->packet_total_size;
+ /* select maximum duration */
+ v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
+ if (v > duration)
+ duration = v;
+ }
+ put_long(s, bit_rate); /* max bit rate */
+ put_long(s, bit_rate); /* avg bit rate */
+ put_long(s, packet_max_size); /* max packet size */
+ if (nb_packets > 0)
+ packet_avg_size = packet_total_size / nb_packets;
+ else
+ packet_avg_size = 0;
+ put_long(s, packet_avg_size); /* avg packet size */
+ put_long(s, nb_packets); /* num packets */
+ put_long(s, duration); /* duration */
+ put_long(s, BUFFER_DURATION); /* preroll */
+ put_long(s, index_pos); /* index offset */
+ /* computation of data the data offset */
+ data_offset_ptr = s->buf_ptr;
+ put_long(s, 0); /* data offset : will be patched after */
+ put_short(s, rm->nb_streams); /* num streams */
+ flags = 1 | 2; /* save allowed & perfect play */
+ if (ctx->is_streamed)
+ flags |= 4; /* live broadcast */
+ put_short(s, flags);
+
+ /* comments */
+ find_tag("title", title, sizeof(title), comment_string);
+ find_tag("author", author, sizeof(author), comment_string);
+ find_tag("copyright", copyright, sizeof(copyright), comment_string);
+ find_tag("comment", comment, sizeof(comment), comment_string);
+
+ put_tag(s,"CONT");
+ size = strlen(title) + strlen(author) + strlen(copyright) + strlen(comment) +
+ 4 * 2 + 10;
+ put_long(s,size);
+ put_short(s,0);
+ put_str(s, title);
+ put_str(s, author);
+ put_str(s, copyright);
+ put_str(s, comment);
+
+ for(i=0;i<rm->nb_streams;i++) {
+ int codec_data_size;
+
+ stream = &rm->streams[i];
+
+ if (stream->enc->codec->type == CODEC_TYPE_AUDIO) {
+ desc = "The Audio Stream";
+ mimetype = "audio/x-pn-realaudio";
+ codec_data_size = 73;
+ } else {
+ desc = "The Video Stream";
+ mimetype = "video/x-pn-realvideo";
+ codec_data_size = 34;
+ }
+
+ put_tag(s,"MDPR");
+ size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
+ put_long(s, size);
+ put_short(s, 0);
+
+ put_short(s, i); /* stream number */
+ put_long(s, stream->bit_rate); /* max bit rate */
+ put_long(s, stream->bit_rate); /* avg bit rate */
+ put_long(s, stream->packet_max_size); /* max packet size */
+ if (stream->nb_packets > 0)
+ packet_avg_size = stream->packet_total_size /
+ stream->nb_packets;
+ else
+ packet_avg_size = 0;
+ put_long(s, packet_avg_size); /* avg packet size */
+ put_long(s, 0); /* start time */
+ put_long(s, BUFFER_DURATION); /* preroll */
+ /* duration */
+ put_long(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
+ put_str8(s, desc);
+ put_str8(s, mimetype);
+ put_long(s, codec_data_size);
+
+ if (stream->enc->codec->type == CODEC_TYPE_AUDIO) {
+ int coded_frame_size, fscode, sample_rate;
+ sample_rate = stream->enc->rate;
+ coded_frame_size = (stream->enc->bit_rate *
+ stream->enc->frame_size) / (8 * sample_rate);
+ /* audio codec info */
+ put_tag(s, ".ra");
+ put_byte(s, 0xfd);
+ put_long(s, 0x00040000); /* version */
+ put_tag(s, ".ra4");
+ put_long(s, 0x01b53530); /* stream length */
+ put_short(s, 4); /* unknown */
+ put_long(s, 0x39); /* header size */
+
+ switch(sample_rate) {
+ case 48000:
+ case 24000:
+ case 12000:
+ fscode = 1;
+ break;
+ default:
+ case 44100:
+ case 22050:
+ case 11025:
+ fscode = 2;
+ break;
+ case 32000:
+ case 16000:
+ case 8000:
+ fscode = 3;
+ }
+ put_short(s, fscode); /* codec additional info, for AC3, seems
+ to be a frequency code */
+ /* special hack to compensate rounding errors... */
+ if (coded_frame_size == 557)
+ coded_frame_size--;
+ put_long(s, coded_frame_size); /* frame length */
+ put_long(s, 0x51540); /* unknown */
+ put_long(s, 0x249f0); /* unknown */
+ put_long(s, 0x249f0); /* unknown */
+ put_short(s, 0x01);
+ /* frame length : seems to be very important */
+ put_short(s, coded_frame_size);
+ put_long(s, 0); /* unknown */
+ put_short(s, stream->enc->rate); /* sample rate */
+ put_long(s, 0x10); /* unknown */
+ put_short(s, stream->enc->channels);
+ put_str8(s, "Int0"); /* codec name */
+ put_str8(s, "dnet"); /* codec name */
+ put_short(s, 0); /* title length */
+ put_short(s, 0); /* author length */
+ put_short(s, 0); /* copyright length */
+ put_byte(s, 0); /* end of header */
+ } else {
+ /* video codec info */
+ put_long(s,34); /* size */
+ put_tag(s,"VIDORV10");
+ put_short(s, stream->enc->width);
+ put_short(s, stream->enc->height);
+ put_short(s, 24); /* frames per seconds ? */
+ put_long(s,0); /* unknown meaning */
+ put_short(s, 12); /* unknown meaning */
+ put_long(s,0); /* unknown meaning */
+ put_short(s, 8); /* unknown meaning */
+ /* Seems to be the codec version: only use basic H263. The next
+ versions seems to add a diffential DC coding as in
+ MPEG... nothing new under the sun */
+ put_long(s,0x10000000);
+ //put_long(s,0x10003000);
+ }
+ }
+
+ /* patch data offset field */
+ data_pos = s->buf_ptr - start_ptr;
+ rm->data_pos = data_pos;
+ data_offset_ptr[0] = data_pos >> 24;
+ data_offset_ptr[1] = data_pos >> 16;
+ data_offset_ptr[2] = data_pos >> 8;
+ data_offset_ptr[3] = data_pos;
+
+ /* data stream */
+ put_tag(s,"DATA");
+ put_long(s,data_size + 10 + 8);
+ put_short(s,0);
+
+ put_long(s, nb_packets); /* number of packets */
+ put_long(s,0); /* next data header */
+}
+
+static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
+ int length, int key_frame)
+{
+ int timestamp;
+ PutByteContext *s = &ctx->pb;
+
+ stream->nb_packets++;
+ stream->packet_total_size += length;
+ if (length > stream->packet_max_size)
+ stream->packet_max_size = length;
+
+ put_short(s,0); /* version */
+ put_short(s,length + 12);
+ put_short(s, stream->num); /* stream number */
+ timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
+ put_long(s, timestamp); /* timestamp */
+ put_byte(s, 0); /* reserved */
+ put_byte(s, key_frame ? 2 : 0); /* flags */
+}
+
+static int rm_write_header(AVFormatContext *s)
+{
+ StreamInfo *stream;
+ RMContext *rm;
+ int n;
+
+ rm = malloc(sizeof(RMContext));
+ if (!rm)
+ return -1;
+ memset(rm, 0, sizeof(RMContext));
+ s->priv_data = rm;
+ n = 0;
+ if (s->audio_enc) {
+ stream = &rm->streams[n];
+ memset(stream, 0, sizeof(StreamInfo));
+ stream->num = n;
+ rm->audio_stream = stream;
+ stream->bit_rate = s->audio_enc->bit_rate;
+ stream->frame_rate = (float)s->audio_enc->rate / (float)s->audio_enc->frame_size;
+ stream->enc = s->audio_enc;
+ /* XXX: dummy values */
+ stream->packet_max_size = 1024;
+ stream->nb_packets = 1000;
+ stream->total_frames = stream->nb_packets;
+ n++;
+ }
+ if (s->video_enc) {
+ stream = &rm->streams[n];
+ memset(stream, 0, sizeof(StreamInfo));
+ stream->num = n;
+ rm->video_stream = stream;
+ stream->bit_rate = s->video_enc->bit_rate;
+ stream->frame_rate = s->video_enc->rate;
+ stream->enc = s->video_enc;
+ /* XXX: dummy values */
+ stream->packet_max_size = 4096;
+ stream->nb_packets = 1000;
+ stream->total_frames = stream->nb_packets;
+ n++;
+ }
+ rm->nb_streams = n;
+
+ rv10_write_header(s, 0, 0);
+ put_flush_packet(&s->pb);
+ return 0;
+}
+
+static int rm_write_audio(AVFormatContext *s, UINT8 *buf, int size)
+{
+ UINT8 buf1[size];
+ RMContext *rm = s->priv_data;
+ PutByteContext *pb = &s->pb;
+ StreamInfo *stream = rm->audio_stream;
+ int i;
+
+ write_packet_header(s, stream, size, stream->enc->key_frame);
+
+ /* for AC3, the words seems to be reversed */
+ for(i=0;i<size;i+=2) {
+ buf1[i] = buf[i+1];
+ buf1[i+1] = buf[i];
+ }
+ put_buffer(pb, buf1, size);
+ put_flush_packet(pb);
+ stream->nb_frames++;
+ return 0;
+}
+
+static int rm_write_video(AVFormatContext *s, UINT8 *buf, int size)
+{
+ RMContext *rm = s->priv_data;
+ PutByteContext *pb = &s->pb;
+ StreamInfo *stream = rm->video_stream;
+ int key_frame = stream->enc->key_frame;
+
+ /* XXX: this is incorrect: should be a parameter */
+
+ /* Well, I spent some time finding the meaning of these bits. I am
+ not sure I understood everything, but it works !! */
+#if 1
+ write_packet_header(s, stream, size + 7, key_frame);
+ /* bit 7: '1' if final packet of a frame converted in several packets */
+ put_byte(pb, 0x81);
+ /* bit 7: '1' if I frame. bits 6..0 : sequence number in current
+ frame starting from 1 */
+ if (key_frame) {
+ put_byte(pb, 0x81);
+ } else {
+ put_byte(pb, 0x01);
+ }
+ put_short(pb, 0x4000 | (size)); /* total frame size */
+ put_short(pb, 0x4000 | (size)); /* offset from the start or the end */
+#else
+ /* seems to be used for prefetch/error correction. Help me ! */
+ write_packet_header(s, size + 6);
+ put_byte(pb, 0xc0);
+ put_short(pb, 0x4000 | size); /* total frame size */
+ put_short(pb, 0x4000 + packet_number * 126);
+#endif
+ put_byte(pb, stream->nb_frames & 0xff);
+
+ put_buffer(pb, buf, size);
+ put_flush_packet(pb);
+
+ stream->nb_frames++;
+ return 0;
+}
+
+static int rm_write_trailer(AVFormatContext *s)
+{
+ RMContext *rm = s->priv_data;
+ int data_size, index_pos, i;
+ PutByteContext *pb = &s->pb;
+
+ if (!s->is_streamed) {
+ /* end of file: finish to write header */
+ index_pos = put_seek(pb, 0, SEEK_CUR);
+ data_size = index_pos - rm->data_pos;
+
+ /* index */
+ put_tag(pb, "INDX");
+ put_long(pb, 10 + 10 * rm->nb_streams);
+ put_short(pb, 0);
+
+ for(i=0;i<rm->nb_streams;i++) {
+ put_long(pb, 0); /* zero indices */
+ put_short(pb, i); /* stream number */
+ put_long(pb, 0); /* next index */
+ }
+ /* undocumented end header */
+ put_long(pb, 0);
+ put_long(pb, 0);
+
+ put_seek(pb, 0, SEEK_SET);
+ for(i=0;i<rm->nb_streams;i++)
+ rm->streams[i].total_frames = rm->streams[i].nb_frames;
+ rv10_write_header(s, data_size, index_pos);
+ } else {
+ /* undocumented end header */
+ put_long(pb, 0);
+ put_long(pb, 0);
+ }
+ put_flush_packet(pb);
+
+ free(rm);
+ return 0;
+}
+
+AVFormat rm_format = {
+ "rm",
+ "rm format",
+ "audio/x-pn-realaudio",
+ "rm,ra",
+ CODEC_ID_AC3,
+ CODEC_ID_RV10,
+ rm_write_header,
+ rm_write_audio,
+ rm_write_video,
+ rm_write_trailer,
+};
+
+AVFormat ra_format = {
+ "ra",
+ "ra format",
+ "audio/x-pn-realaudio",
+ "ra",
+ CODEC_ID_AC3,
+ CODEC_ID_NONE,
+ rm_write_header,
+ rm_write_audio,
+ NULL,
+ rm_write_trailer,
+};
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