split swf de/muxer

Originally committed as revision 13203 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 561 insertions, 0 deletions

diff --git a/libavformat/swfenc.c b/libavformat/swfenc.c
new file mode 100644
index 0000000000..a793742bf3
--- /dev/null
+++ b/libavformat/swfenc.c
@@ -0,0 +1,561 @@
+/*
+ * Flash Compatible Streaming Format muxer.
+ * Copyright (c) 2000 Fabrice Bellard.
+ * Copyright (c) 2003 Tinic Uro.
+ *
+ * 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
+ */
+
+#include "libavcodec/bitstream.h"
+#include "avformat.h"
+#include "swf.h"
+
+static void put_swf_tag(AVFormatContext *s, int tag)
+{
+    SWFContext *swf = s->priv_data;
+    ByteIOContext *pb = s->pb;
+
+    swf->tag_pos = url_ftell(pb);
+    swf->tag = tag;
+    /* reserve some room for the tag */
+    if (tag & TAG_LONG) {
+        put_le16(pb, 0);
+        put_le32(pb, 0);
+    } else {
+        put_le16(pb, 0);
+    }
+}
+
+static void put_swf_end_tag(AVFormatContext *s)
+{
+    SWFContext *swf = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    offset_t pos;
+    int tag_len, tag;
+
+    pos = url_ftell(pb);
+    tag_len = pos - swf->tag_pos - 2;
+    tag = swf->tag;
+    url_fseek(pb, swf->tag_pos, SEEK_SET);
+    if (tag & TAG_LONG) {
+        tag &= ~TAG_LONG;
+        put_le16(pb, (tag << 6) | 0x3f);
+        put_le32(pb, tag_len - 4);
+    } else {
+        assert(tag_len < 0x3f);
+        put_le16(pb, (tag << 6) | tag_len);
+    }
+    url_fseek(pb, pos, SEEK_SET);
+}
+
+static inline void max_nbits(int *nbits_ptr, int val)
+{
+    int n;
+
+    if (val == 0)
+        return;
+    val = abs(val);
+    n = 1;
+    while (val != 0) {
+        n++;
+        val >>= 1;
+    }
+    if (n > *nbits_ptr)
+        *nbits_ptr = n;
+}
+
+static void put_swf_rect(ByteIOContext *pb,
+                         int xmin, int xmax, int ymin, int ymax)
+{
+    PutBitContext p;
+    uint8_t buf[256];
+    int nbits, mask;
+
+    init_put_bits(&p, buf, sizeof(buf));
+
+    nbits = 0;
+    max_nbits(&nbits, xmin);
+    max_nbits(&nbits, xmax);
+    max_nbits(&nbits, ymin);
+    max_nbits(&nbits, ymax);
+    mask = (1 << nbits) - 1;
+
+    /* rectangle info */
+    put_bits(&p, 5, nbits);
+    put_bits(&p, nbits, xmin & mask);
+    put_bits(&p, nbits, xmax & mask);
+    put_bits(&p, nbits, ymin & mask);
+    put_bits(&p, nbits, ymax & mask);
+
+    flush_put_bits(&p);
+    put_buffer(pb, buf, pbBufPtr(&p) - p.buf);
+}
+
+static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
+{
+    int nbits, mask;
+
+    put_bits(pb, 1, 1); /* edge */
+    put_bits(pb, 1, 1); /* line select */
+    nbits = 2;
+    max_nbits(&nbits, dx);
+    max_nbits(&nbits, dy);
+
+    mask = (1 << nbits) - 1;
+    put_bits(pb, 4, nbits - 2); /* 16 bits precision */
+    if (dx == 0) {
+        put_bits(pb, 1, 0);
+        put_bits(pb, 1, 1);
+        put_bits(pb, nbits, dy & mask);
+    } else if (dy == 0) {
+        put_bits(pb, 1, 0);
+        put_bits(pb, 1, 0);
+        put_bits(pb, nbits, dx & mask);
+    } else {
+        put_bits(pb, 1, 1);
+        put_bits(pb, nbits, dx & mask);
+        put_bits(pb, nbits, dy & mask);
+    }
+}
+
+#define FRAC_BITS 16
+
+/* put matrix */
+static void put_swf_matrix(ByteIOContext *pb,
+                           int a, int b, int c, int d, int tx, int ty)
+{
+    PutBitContext p;
+    uint8_t buf[256];
+    int nbits;
+
+    init_put_bits(&p, buf, sizeof(buf));
+
+    put_bits(&p, 1, 1); /* a, d present */
+    nbits = 1;
+    max_nbits(&nbits, a);
+    max_nbits(&nbits, d);
+    put_bits(&p, 5, nbits); /* nb bits */
+    put_bits(&p, nbits, a);
+    put_bits(&p, nbits, d);
+
+    put_bits(&p, 1, 1); /* b, c present */
+    nbits = 1;
+    max_nbits(&nbits, c);
+    max_nbits(&nbits, b);
+    put_bits(&p, 5, nbits); /* nb bits */
+    put_bits(&p, nbits, c);
+    put_bits(&p, nbits, b);
+
+    nbits = 1;
+    max_nbits(&nbits, tx);
+    max_nbits(&nbits, ty);
+    put_bits(&p, 5, nbits); /* nb bits */
+    put_bits(&p, nbits, tx);
+    put_bits(&p, nbits, ty);
+
+    flush_put_bits(&p);
+    put_buffer(pb, buf, pbBufPtr(&p) - p.buf);
+}
+
+/* */
+static int swf_write_header(AVFormatContext *s)
+{
+    SWFContext *swf = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    AVCodecContext *enc, *audio_enc, *video_enc;
+    PutBitContext p;
+    uint8_t buf1[256];
+    int i, width, height, rate, rate_base;
+    int is_avm2;
+
+    swf->audio_in_pos = 0;
+    swf->sound_samples = 0;
+    swf->swf_frame_number = 0;
+    swf->video_frame_number = 0;
+
+    video_enc = NULL;
+    audio_enc = NULL;
+    for(i=0;i<s->nb_streams;i++) {
+        enc = s->streams[i]->codec;
+        if (enc->codec_type == CODEC_TYPE_AUDIO) {
+            if (enc->codec_id == CODEC_ID_MP3) {
+                if (!enc->frame_size) {
+                    av_log(s, AV_LOG_ERROR, "audio frame size not set\n");
+                    return -1;
+                }
+                audio_enc = enc;
+            } else {
+                av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
+                return -1;
+            }
+        } else {
+            if (enc->codec_id == CODEC_ID_VP6F ||
+                enc->codec_id == CODEC_ID_FLV1 ||
+                enc->codec_id == CODEC_ID_MJPEG) {
+                video_enc = enc;
+            } else {
+                av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n");
+                return -1;
+            }
+        }
+    }
+
+    if (!video_enc) {
+        /* currently, cannot work correctly if audio only */
+        swf->video_type = 0;
+        width = 320;
+        height = 200;
+        rate = 10;
+        rate_base= 1;
+    } else {
+        swf->video_type = video_enc->codec_id;
+        width = video_enc->width;
+        height = video_enc->height;
+        rate = video_enc->time_base.den;
+        rate_base = video_enc->time_base.num;
+    }
+
+    if (!audio_enc) {
+        swf->audio_type = 0;
+        swf->samples_per_frame = (44100. * rate_base) / rate;
+    } else {
+        swf->audio_type = audio_enc->codec_id;
+        swf->samples_per_frame = (audio_enc->sample_rate * rate_base) / rate;
+    }
+
+    is_avm2 = !strcmp("avm2", s->oformat->name);
+
+    put_tag(pb, "FWS");
+    if (is_avm2) {
+        put_byte(pb, 9);
+    } else if (video_enc && video_enc->codec_id == CODEC_ID_VP6F) {
+        put_byte(pb, 8); /* version (version 8 and above support VP6 codec) */
+    } else if (video_enc && video_enc->codec_id == CODEC_ID_FLV1) {
+        put_byte(pb, 6); /* version (version 6 and above support FLV1 codec) */
+    } else {
+        put_byte(pb, 4); /* version (should use 4 for mpeg audio support) */
+    }
+    put_le32(pb, DUMMY_FILE_SIZE); /* dummy size
+                                      (will be patched if not streamed) */
+
+    put_swf_rect(pb, 0, width * 20, 0, height * 20);
+    put_le16(pb, (rate * 256) / rate_base); /* frame rate */
+    swf->duration_pos = url_ftell(pb);
+    put_le16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
+
+    /* avm2/swf v9 (also v8?) files require a file attribute tag */
+    if (is_avm2) {
+        put_swf_tag(s, TAG_FILEATTRIBUTES);
+        put_le32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
+        put_swf_end_tag(s);
+    }
+
+    /* define a shape with the jpeg inside */
+    if (video_enc && (video_enc->codec_id == CODEC_ID_VP6F ||
+                       video_enc->codec_id == CODEC_ID_FLV1)) {
+    } else if (video_enc && video_enc->codec_id == CODEC_ID_MJPEG) {
+        put_swf_tag(s, TAG_DEFINESHAPE);
+
+        put_le16(pb, SHAPE_ID); /* ID of shape */
+        /* bounding rectangle */
+        put_swf_rect(pb, 0, width, 0, height);
+        /* style info */
+        put_byte(pb, 1); /* one fill style */
+        put_byte(pb, 0x41); /* clipped bitmap fill */
+        put_le16(pb, BITMAP_ID); /* bitmap ID */
+        /* position of the bitmap */
+        put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0,
+                       0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0);
+        put_byte(pb, 0); /* no line style */
+
+        /* shape drawing */
+        init_put_bits(&p, buf1, sizeof(buf1));
+        put_bits(&p, 4, 1); /* one fill bit */
+        put_bits(&p, 4, 0); /* zero line bit */
+
+        put_bits(&p, 1, 0); /* not an edge */
+        put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
+        put_bits(&p, 5, 1); /* nbits */
+        put_bits(&p, 1, 0); /* X */
+        put_bits(&p, 1, 0); /* Y */
+        put_bits(&p, 1, 1); /* set fill style 1 */
+
+        /* draw the rectangle ! */
+        put_swf_line_edge(&p, width, 0);
+        put_swf_line_edge(&p, 0, height);
+        put_swf_line_edge(&p, -width, 0);
+        put_swf_line_edge(&p, 0, -height);
+
+        /* end of shape */
+        put_bits(&p, 1, 0); /* not an edge */
+        put_bits(&p, 5, 0);
+
+        flush_put_bits(&p);
+        put_buffer(pb, buf1, pbBufPtr(&p) - p.buf);
+
+        put_swf_end_tag(s);
+    }
+
+    if (audio_enc && audio_enc->codec_id == CODEC_ID_MP3) {
+        int v;
+
+        /* start sound */
+        put_swf_tag(s, TAG_STREAMHEAD2);
+
+        v = 0;
+        switch(audio_enc->sample_rate) {
+        case 11025:
+            v |= 1 << 2;
+            break;
+        case 22050:
+            v |= 2 << 2;
+            break;
+        case 44100:
+            v |= 3 << 2;
+            break;
+        default:
+            /* not supported */
+            av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
+            return -1;
+        }
+        v |= 0x02; /* 16 bit playback */
+        if (audio_enc->channels == 2)
+            v |= 0x01; /* stereo playback */
+        put_byte(s->pb, v);
+        v |= 0x20; /* mp3 compressed */
+        put_byte(s->pb, v);
+        put_le16(s->pb, swf->samples_per_frame);  /* avg samples per frame */
+        put_le16(s->pb, 0);
+
+        put_swf_end_tag(s);
+    }
+
+    put_flush_packet(s->pb);
+    return 0;
+}
+
+static int swf_write_video(AVFormatContext *s,
+                           AVCodecContext *enc, const uint8_t *buf, int size)
+{
+    SWFContext *swf = s->priv_data;
+    ByteIOContext *pb = s->pb;
+
+    /* Flash Player limit */
+    if (swf->swf_frame_number == 16000) {
+        av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
+    }
+
+    if (swf->video_type == CODEC_ID_VP6F ||
+        swf->video_type == CODEC_ID_FLV1) {
+        if (swf->video_frame_number == 0) {
+            /* create a new video object */
+            put_swf_tag(s, TAG_VIDEOSTREAM);
+            put_le16(pb, VIDEO_ID);
+            put_le16(pb, 15000); /* hard flash player limit */
+            put_le16(pb, enc->width);
+            put_le16(pb, enc->height);
+            put_byte(pb, 0);
+            put_byte(pb,codec_get_tag(swf_codec_tags,swf->video_type));
+            put_swf_end_tag(s);
+
+            /* place the video object for the first time */
+            put_swf_tag(s, TAG_PLACEOBJECT2);
+            put_byte(pb, 0x36);
+            put_le16(pb, 1);
+            put_le16(pb, VIDEO_ID);
+            put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
+            put_le16(pb, swf->video_frame_number);
+            put_byte(pb, 'v');
+            put_byte(pb, 'i');
+            put_byte(pb, 'd');
+            put_byte(pb, 'e');
+            put_byte(pb, 'o');
+            put_byte(pb, 0x00);
+            put_swf_end_tag(s);
+        } else {
+            /* mark the character for update */
+            put_swf_tag(s, TAG_PLACEOBJECT2);
+            put_byte(pb, 0x11);
+            put_le16(pb, 1);
+            put_le16(pb, swf->video_frame_number);
+            put_swf_end_tag(s);
+        }
+
+        /* set video frame data */
+        put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
+        put_le16(pb, VIDEO_ID);
+        put_le16(pb, swf->video_frame_number++);
+        put_buffer(pb, buf, size);
+        put_swf_end_tag(s);
+    } else if (swf->video_type == CODEC_ID_MJPEG) {
+        if (swf->swf_frame_number > 0) {
+            /* remove the shape */
+            put_swf_tag(s, TAG_REMOVEOBJECT);
+            put_le16(pb, SHAPE_ID); /* shape ID */
+            put_le16(pb, 1); /* depth */
+            put_swf_end_tag(s);
+
+            /* free the bitmap */
+            put_swf_tag(s, TAG_FREECHARACTER);
+            put_le16(pb, BITMAP_ID);
+            put_swf_end_tag(s);
+        }
+
+        put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
+
+        put_le16(pb, BITMAP_ID); /* ID of the image */
+
+        /* a dummy jpeg header seems to be required */
+        put_byte(pb, 0xff);
+        put_byte(pb, 0xd8);
+        put_byte(pb, 0xff);
+        put_byte(pb, 0xd9);
+        /* write the jpeg image */
+        put_buffer(pb, buf, size);
+
+        put_swf_end_tag(s);
+
+        /* draw the shape */
+
+        put_swf_tag(s, TAG_PLACEOBJECT);
+        put_le16(pb, SHAPE_ID); /* shape ID */
+        put_le16(pb, 1); /* depth */
+        put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
+        put_swf_end_tag(s);
+    } else {
+        /* invalid codec */
+    }
+
+    swf->swf_frame_number ++;
+
+    /* streaming sound always should be placed just before showframe tags */
+    if (swf->audio_type && swf->audio_in_pos) {
+        put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
+        put_le16(pb, swf->sound_samples);
+        put_le16(pb, 0); // seek samples
+        put_buffer(pb, swf->audio_fifo, swf->audio_in_pos);
+        put_swf_end_tag(s);
+
+        /* update FIFO */
+        swf->sound_samples = 0;
+        swf->audio_in_pos = 0;
+    }
+
+    /* output the frame */
+    put_swf_tag(s, TAG_SHOWFRAME);
+    put_swf_end_tag(s);
+
+    put_flush_packet(s->pb);
+
+    return 0;
+}
+
+static int swf_write_audio(AVFormatContext *s,
+                           AVCodecContext *enc, const uint8_t *buf, int size)
+{
+    SWFContext *swf = s->priv_data;
+
+    /* Flash Player limit */
+    if (swf->swf_frame_number == 16000) {
+        av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
+    }
+
+    if (swf->audio_in_pos + size >= AUDIO_FIFO_SIZE) {
+        av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
+        return -1;
+    }
+
+    memcpy(swf->audio_fifo +  swf->audio_in_pos, buf, size);
+    swf->audio_in_pos += size;
+    swf->sound_samples += enc->frame_size;
+
+    /* if audio only stream make sure we add swf frames */
+    if (swf->video_type == 0) {
+        swf_write_video(s, enc, 0, 0);
+    }
+
+    return 0;
+}
+
+static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
+    if (codec->codec_type == CODEC_TYPE_AUDIO)
+        return swf_write_audio(s, codec, pkt->data, pkt->size);
+    else
+        return swf_write_video(s, codec, pkt->data, pkt->size);
+}
+
+static int swf_write_trailer(AVFormatContext *s)
+{
+    SWFContext *swf = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    AVCodecContext *enc, *video_enc;
+    int file_size, i;
+
+    video_enc = NULL;
+    for(i=0;i<s->nb_streams;i++) {
+        enc = s->streams[i]->codec;
+        if (enc->codec_type == CODEC_TYPE_VIDEO)
+            video_enc = enc;
+    }
+
+    put_swf_tag(s, TAG_END);
+    put_swf_end_tag(s);
+
+    put_flush_packet(s->pb);
+
+    /* patch file size and number of frames if not streamed */
+    if (!url_is_streamed(s->pb) && video_enc) {
+        file_size = url_ftell(pb);
+        url_fseek(pb, 4, SEEK_SET);
+        put_le32(pb, file_size);
+        url_fseek(pb, swf->duration_pos, SEEK_SET);
+        put_le16(pb, video_enc->frame_number);
+        url_fseek(pb, file_size, SEEK_SET);
+    }
+    return 0;
+}
+
+#ifdef CONFIG_SWF_MUXER
+AVOutputFormat swf_muxer = {
+    "swf",
+    "Flash format",
+    "application/x-shockwave-flash",
+    "swf",
+    sizeof(SWFContext),
+    CODEC_ID_MP3,
+    CODEC_ID_FLV1,
+    swf_write_header,
+    swf_write_packet,
+    swf_write_trailer,
+};
+#endif
+#ifdef CONFIG_AVM2_MUXER
+AVOutputFormat avm2_muxer = {
+    "avm2",
+    "Flash 9 (AVM2) format",
+    "application/x-shockwave-flash",
+    NULL,
+    sizeof(SWFContext),
+    CODEC_ID_MP3,
+    CODEC_ID_FLV1,
+    swf_write_header,
+    swf_write_packet,
+    swf_write_trailer,
+};
+#endif