* a64 muxer
* Copyright (c) 2009 Tobias Bindhammer
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavcodec/a64enc.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
+#include "rawenc.h"
-typedef struct A64MuxerContext {
- int interleaved;
- AVPacket prev_pkt;
- int prev_frame_count;
-} A64MuxerContext;
-
-static int a64_write_header(struct AVFormatContext *s)
+static int a64_write_header(AVFormatContext *s)
{
- AVCodecContext *avctx=s->streams[0]->codec;
- A64MuxerContext *c = s->priv_data;
+ AVCodecContext *avctx = s->streams[0]->codec;
uint8_t header[5] = {
0x00, //load
0x40, //address
0x00, //charset_lifetime (multi only)
0x00 //fps in 50/fps;
};
- c->interleaved = 0;
+
+ if (avctx->extradata_size < 4) {
+ av_log(s, AV_LOG_ERROR, "Missing extradata\n");
+ return AVERROR_INVALIDDATA;
+ }
+
switch (avctx->codec->id) {
- case CODEC_ID_A64_MULTI:
+ case AV_CODEC_ID_A64_MULTI:
header[2] = 0x00;
header[3] = AV_RB32(avctx->extradata+0);
header[4] = 2;
break;
- case CODEC_ID_A64_MULTI5:
+ case AV_CODEC_ID_A64_MULTI5:
header[2] = 0x01;
header[3] = AV_RB32(avctx->extradata+0);
header[4] = 3;
break;
default:
- return AVERROR(EINVAL);
- break;
+ return AVERROR_INVALIDDATA;
}
- put_buffer(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 CODEC_ID_A64_MULTI:
- case 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 */
- put_buffer(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++) put_byte(s->pb, 0);
- }
- if(c->prev_pkt.data) {
- /* put frame (screen + colram) from last packet into buffer */
- put_buffer(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++) put_byte(s->pb, 0);
- }
- }
- /* backup current packet for next turn */
- if(pkt->data) {
- av_new_packet(&c->prev_pkt, pkt->size);
- memcpy(c->prev_pkt.data, pkt->data, pkt->size);
- }
- 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) put_buffer(s->pb, pkt->data, pkt->size);
- break;
- }
-
- put_flush_packet(s->pb);
- return 0;
-}
-
-static int a64_write_trailer(struct AVFormatContext *s)
-{
- A64MuxerContext *c = s->priv_data;
- AVPacket pkt;
- /* need to flush last packet? */
- if(c->interleaved) a64_write_packet(s, &pkt);
+ avio_write(s->pb, header, 2);
return 0;
}
-AVOutputFormat a64_muxer = {
- .name = "a64",
- .long_name = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
- .mime_type = NULL,
- .extensions = "a64, A64",
- .priv_data_size = sizeof (A64Context),
- .video_codec = CODEC_ID_A64_MULTI,
- a64_write_header,
- a64_write_packet,
- a64_write_trailer
+AVOutputFormat ff_a64_muxer = {
+ .name = "a64",
+ .long_name = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
+ .extensions = "a64, A64",
+ .video_codec = AV_CODEC_ID_A64_MULTI,
+ .write_header = a64_write_header,
+ .write_packet = ff_raw_write_packet,
};
projects / ffmpeg / blobdiff