a64: remove interleaved mode.

It has been disabled since it was added two years ago.

libavformat/a64.c

@@ -23,17 +23,11 @@
 #include "libavcodec/a64enc.h"
 #include "libavcodec/bytestream.h"
 #include "avformat.h"
-
-typedef struct A64MuxerContext {
-    int interleaved;
-    AVPacket prev_pkt;
-    int prev_frame_count;
-} A64MuxerContext;
+#include "rawenc.h"
 
 static int a64_write_header(struct AVFormatContext *s)
 {
     AVCodecContext *avctx = s->streams[0]->codec;
-    A64MuxerContext *c = s->priv_data;
     uint8_t header[5] = {
         0x00, //load
         0x40, //address
@@ -41,7 +35,6 @@ static int a64_write_header(struct AVFormatContext *s)
         0x00, //charset_lifetime (multi only)
         0x00  //fps in 50/fps;
     };
-    c->interleaved = 0;
     switch (avctx->codec->id) {
     case AV_CODEC_ID_A64_MULTI:
         header[2] = 0x00;
@@ -57,109 +50,6 @@ static int a64_write_header(struct AVFormatContext *s)
         return AVERROR(EINVAL);
     }
     avio_write(s->pb, header, 2);
-    c->prev_pkt.size = 0;
-    c->prev_frame_count = 0;
-    return 0;
-}
-
-static int a64_write_packet(struct AVFormatContext *s, AVPacket *pkt)
-{
-    AVCodecContext *avctx = s->streams[0]->codec;
-    A64MuxerContext *c = s->priv_data;
-    int i, j;
-    int ch_chunksize;
-    int lifetime;
-    int frame_count;
-    int charset_size;
-    int frame_size;
-    int num_frames;
-
-    /* fetch values from extradata */
-    switch (avctx->codec->id) {
-    case AV_CODEC_ID_A64_MULTI:
-    case AV_CODEC_ID_A64_MULTI5:
-        if(c->interleaved) {
-            /* Write interleaved, means we insert chunks of the future charset before each current frame.
-             * Reason: if we load 1 charset + corresponding frames in one block on c64, we need to store
-             * them first and then display frame by frame to keep in sync. Thus we would read and write
-             * the data for colram from/to ram first and waste too much time. If we interleave and send the
-             * charset beforehand, we assemble a new charset chunk by chunk, write current screen data to
-             * screen-ram to be displayed and decode the colram directly to colram-location $d800 during
-             * the overscan, while reading directly from source.
-             * This is the only way so far, to achieve 25fps on c64 */
-            if(avctx->extradata) {
-                /* fetch values from extradata */
-                lifetime     = AV_RB32(avctx->extradata + 0);
-                frame_count  = AV_RB32(avctx->extradata + 4);
-                charset_size = AV_RB32(avctx->extradata + 8);
-                frame_size   = AV_RB32(avctx->extradata + 12);
-
-                /* TODO: sanity checks? */
-            } else {
-                av_log(avctx, AV_LOG_ERROR, "extradata not set\n");
-                return AVERROR(EINVAL);
-            }
-
-            ch_chunksize=charset_size/lifetime;
-            /* TODO: check if charset/size is % lifetime, but maybe check in codec */
-
-            if(pkt->data) num_frames = lifetime;
-            else num_frames = c->prev_frame_count;
-
-            for(i = 0; i < num_frames; i++) {
-                if(pkt->data) {
-                    /* if available, put newest charset chunk into buffer */
-                    avio_write(s->pb, pkt->data + ch_chunksize * i, ch_chunksize);
-                } else {
-                    /* a bit ugly, but is there an alternative to put many zeros? */
-                    for(j = 0; j < ch_chunksize; j++) avio_w8(s->pb, 0);
-                }
-
-                if(c->prev_pkt.data) {
-                    /* put frame (screen + colram) from last packet into buffer */
-                    avio_write(s->pb, c->prev_pkt.data + charset_size + frame_size * i, frame_size);
-                } else {
-                    /* a bit ugly, but is there an alternative to put many zeros? */
-                    for(j = 0; j < frame_size; j++) avio_w8(s->pb, 0);
-                }
-            }
-
-            /* backup current packet for next turn */
-            if(pkt->data) {
-                /* no backup packet yet? create one! */
-                if(!c->prev_pkt.data) av_new_packet(&c->prev_pkt, pkt->size);
-                /* we have a packet and data is big enough, reuse it */
-                if(c->prev_pkt.data && c->prev_pkt.size >= pkt->size) {
-                    memcpy(c->prev_pkt.data, pkt->data, pkt->size);
-                    c->prev_pkt.size = pkt->size;
-                } else {
-                    av_log(avctx, AV_LOG_ERROR, "Too less memory for prev_pkt.\n");
-                    return AVERROR(ENOMEM);
-                }
-            }
-
-            c->prev_frame_count = frame_count;
-            break;
-        }
-        default:
-            /* Write things as is. Nice for self-contained frames from non-multicolor modes or if played
-             * directly from ram and not from a streaming device (rrnet/mmc) */
-            if(pkt) avio_write(s->pb, pkt->data, pkt->size);
-        break;
-    }
-
-    avio_flush(s->pb);
-    return 0;
-}
-
-static int a64_write_trailer(struct AVFormatContext *s)
-{
-    A64MuxerContext *c = s->priv_data;
-    AVPacket pkt = {0};
-    /* need to flush last packet? */
-    if(c->interleaved) a64_write_packet(s, &pkt);
-    /* discard backed up packet */
-    if(c->prev_pkt.data) av_destruct_packet(&c->prev_pkt);
     return 0;
 }
 
@@ -167,9 +57,7 @@ AVOutputFormat ff_a64_muxer = {
     .name           = "a64",
     .long_name      = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
     .extensions     = "a64, A64",
-    .priv_data_size = sizeof (A64Context),
     .video_codec    = AV_CODEC_ID_A64_MULTI,
     .write_header   = a64_write_header,
-    .write_packet   = a64_write_packet,
-    .write_trailer  = a64_write_trailer,
+    .write_packet   = ff_raw_write_packet,
 };