X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Fa64.c;h=c8e8e646b52d7c2b9b257736a907867cf93baffa;hb=76ccf114a6c107218e2a1948afc1d0fb3ac7ba0b;hp=3bc03a6794ae4f76a76ae7229b4013695dbfa1a7;hpb=133cc989ddd71c2c9a0d956dc7c0056cd6b8eef7;p=ffmpeg diff --git a/libavformat/a64.c b/libavformat/a64.c index 3bc03a6794a..c8e8e646b52 100644 --- a/libavformat/a64.c +++ b/libavformat/a64.c @@ -2,20 +2,20 @@ * 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 */ @@ -23,17 +23,11 @@ #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; uint8_t header[5] = { 0x00, //load 0x40, //address @@ -41,124 +35,35 @@ static int a64_write_header(struct AVFormatContext *s) 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; - } - 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; + return AVERROR_INVALIDDATA; } - - 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, };