[FFmpeg-devel] [PATCH] libcaca output device

Paul B Mahol onemda at gmail.com
Thu Jul 19 17:10:22 CEST 2012


Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
 configure                |   12 +++
 libavdevice/Makefile     |    1 +
 libavdevice/alldevices.c |    1 +
 libavdevice/caca.c       |  191 ++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 205 insertions(+), 0 deletions(-)
 create mode 100644 libavdevice/caca.c

diff --git a/configure b/configure
index 7b25877..2198e45 100755
--- a/configure
+++ b/configure
@@ -1177,6 +1177,7 @@ HAVE_LIST="
     $ARCH_EXT_LIST
     $HAVE_LIST_PUB
     $THREADS_LIST
+    caca
     aligned_malloc
     aligned_stack
     alsa_asoundlib_h
@@ -1705,6 +1706,7 @@ oss_indev_deps_any="soundcard_h sys_soundcard_h"
 oss_outdev_deps_any="soundcard_h sys_soundcard_h"
 pulse_indev_deps="libpulse"
 sdl_outdev_deps="sdl"
+caca_outdev_deps="caca"
 sndio_indev_deps="sndio_h"
 sndio_outdev_deps="sndio_h"
 v4l_indev_deps="linux_videodev_h"
@@ -3377,6 +3379,14 @@ if enabled libdc1394; then
     die "ERROR: No version of libdc1394 found "
 fi
 
+CACA_CONFIG="${cross_prefix}caca-config"
+if "${CACA_CONFIG}" --version > /dev/null 2>&1; then
+    caca_cflags=$("${CACA_CONFIG}" --cflags)
+    caca_libs=$("${CACA_CONFIG}" --libs)
+    enable caca
+fi
+enabled caca && add_cflags $caca_cflags && add_extralibs $caca_libs
+
 SDL_CONFIG="${cross_prefix}sdl-config"
 if check_pkg_config sdl SDL_events.h SDL_PollEvent; then
     check_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) >= 0x010201" $sdl_cflags &&
@@ -3831,6 +3841,8 @@ HOSTLDFLAGS=$host_ldflags
 HOSTLIBS=$host_libs
 TARGET_EXEC=$target_exec
 TARGET_PATH=$target_path
+CACA_LIBS=$caca_libs
+CACA_CFLAGS=$caca_cflags
 SDL_LIBS=$sdl_libs
 SDL_CFLAGS=$sdl_cflags
 LIB_INSTALL_EXTRA_CMD=$LIB_INSTALL_EXTRA_CMD
diff --git a/libavdevice/Makefile b/libavdevice/Makefile
index 4759a82..8f6f843 100644
--- a/libavdevice/Makefile
+++ b/libavdevice/Makefile
@@ -16,6 +16,7 @@ OBJS-$(CONFIG_ALSA_INDEV)                += alsa-audio-common.o \
 OBJS-$(CONFIG_ALSA_OUTDEV)               += alsa-audio-common.o \
                                             alsa-audio-enc.o
 OBJS-$(CONFIG_BKTR_INDEV)                += bktr.o
+OBJS-$(CONFIG_CACA_OUTDEV)               += caca.o
 OBJS-$(CONFIG_DSHOW_INDEV)               += dshow.o dshow_enummediatypes.o \
                                             dshow_enumpins.o dshow_filter.o \
                                             dshow_pin.o dshow_common.o
diff --git a/libavdevice/alldevices.c b/libavdevice/alldevices.c
index 2a0bffb..092e6c5 100644
--- a/libavdevice/alldevices.c
+++ b/libavdevice/alldevices.c
@@ -40,6 +40,7 @@ void avdevice_register_all(void)
     /* devices */
     REGISTER_INOUTDEV (ALSA, alsa);
     REGISTER_INDEV    (BKTR, bktr);
+    REGISTER_OUTDEV   (CACA, caca);
     REGISTER_INDEV    (DSHOW, dshow);
     REGISTER_INDEV    (DV1394, dv1394);
     REGISTER_INDEV    (FBDEV, fbdev);
diff --git a/libavdevice/caca.c b/libavdevice/caca.c
new file mode 100644
index 0000000..d5e6edf
--- /dev/null
+++ b/libavdevice/caca.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (c) 2011 Paul B Mahol
+ *
+ * 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 <caca.h>
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avdevice.h"
+
+typedef struct {
+    AVClass        *class;
+    char           *window_title;
+
+    caca_canvas_t  *canvas;
+    caca_display_t *display;
+    caca_dither_t  *dither;
+
+    int            width;
+    int            height;
+
+    char           *antialias;
+    char           *charset;
+    char           *colors;
+    char           *algorithm;
+    char           *driver;
+} CACAContext;
+
+static int caca_write_trailer(AVFormatContext *s)
+{
+    CACAContext *c= s->priv_data;
+
+    av_freep(&c->window_title);
+
+    caca_free_dither(c->dither);
+    caca_free_display(c->display);
+    caca_free_canvas(c->canvas);
+    return 0;
+}
+
+static int caca_write_header(AVFormatContext *s)
+{
+    CACAContext *c= s->priv_data;
+    AVStream *st = s->streams[0];
+    AVCodecContext *encctx = st->codec;
+    int ret, i, bpp;
+
+    if (   s->nb_streams > 1
+        || encctx->codec_type != AVMEDIA_TYPE_VIDEO
+        || encctx->codec_id   != CODEC_ID_RAWVIDEO) {
+        av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream.\n");
+        return AVERROR(EINVAL);
+    }
+
+    if (encctx->pix_fmt != PIX_FMT_RGB24) {
+        av_log(s, AV_LOG_ERROR,
+               "Unsupported pixel format '%s', choose rgb24.\n",
+               av_get_pix_fmt_name(encctx->pix_fmt));
+        return AVERROR(EINVAL);
+    }
+
+    c->canvas = caca_create_canvas(encctx->width, encctx->height);
+    if (!c->canvas) {
+        av_log(s, AV_LOG_ERROR, "Failed to create canvas.\n");
+        return AVERROR(ENOMEM);
+    }
+
+    c->display = caca_create_display_with_driver(c->canvas, c->driver);
+    if (!c->display) {
+        const char *const *drivers = caca_get_display_driver_list();
+
+        av_log(s, AV_LOG_ERROR, "Failed to create display.\n");
+        av_log(s, AV_LOG_INFO, "Possible drivers:\n");
+        for (i = 0; drivers[i]; i += 2)
+            av_log(s, AV_LOG_INFO, "%s : %s\n", drivers[i], drivers[i + 1]);
+        caca_free_canvas(c->canvas);
+        return AVERROR(EINVAL);
+    }
+
+    c->width  = caca_get_canvas_width(c->canvas);
+    c->height = caca_get_canvas_height(c->canvas);
+
+    bpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[encctx->pix_fmt]);
+    c->dither = caca_create_dither(bpp, encctx->width, encctx->height,
+                                   bpp * encctx->width / 8,
+                                   0x0000ff, 0x00ff00, 0xff0000, 0);
+    if (!c->dither) {
+        av_log(s, AV_LOG_ERROR, "Failed to create dither.\n");
+        ret =  AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    ret  = caca_set_dither_algorithm(c->dither, c->algorithm);
+    ret += caca_set_dither_antialias(c->dither, c->antialias);
+    ret += caca_set_dither_charset(c->dither, c->charset);
+    ret += caca_set_dither_color(c->dither, c->colors);
+
+    if (ret) {
+        const char *const *algorithm = caca_get_dither_algorithm_list(c->dither);
+        const char *const *antialias = caca_get_dither_antialias_list(c->dither);
+        const char *const *charset = caca_get_dither_charset_list(c->dither);
+        const char *const *color = caca_get_dither_color_list(c->dither);
+
+        av_log(s, AV_LOG_ERROR, "Invalid value given to one of options.\n");
+        av_log(s, AV_LOG_INFO, "Possible dithering algorithms:\n");
+        for (i = 0; algorithm[i]; i += 2)
+            av_log(s, AV_LOG_INFO, "%s : %s\n", algorithm[i], algorithm[i + 1]);
+        av_log(s, AV_LOG_INFO, "\n");
+        av_log(s, AV_LOG_INFO, "Possible antialias:\n");
+        for (i = 0; antialias[i]; i += 2)
+            av_log(s, AV_LOG_INFO, "%s : %s\n", antialias[i], antialias[i + 1]);
+        av_log(s, AV_LOG_INFO, "\n");
+        av_log(s, AV_LOG_INFO, "Possible charsets:\n");
+        for (i = 0; charset[i]; i += 2)
+            av_log(s, AV_LOG_INFO, "%s : %s\n", charset[i], charset[i + 1]);
+        av_log(s, AV_LOG_INFO, "\n");
+        av_log(s, AV_LOG_INFO, "Possible colors:\n");
+        for (i = 0; color[i]; i += 2)
+            av_log(s, AV_LOG_INFO, "%s : %s\n", color[i], color[i + 1]);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    if (!c->window_title)
+        c->window_title = av_strdup(s->filename);
+    caca_set_display_title(c->display, c->window_title);
+    caca_set_display_time(c->display, av_rescale_q(1, st->codec->time_base, AV_TIME_BASE_Q));
+
+    return 0;
+
+fail:
+    caca_write_trailer(s);
+    return ret;
+}
+
+static int caca_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    CACAContext *c= s->priv_data;
+
+    caca_dither_bitmap(c->canvas, 0, 0, c->width, c->height, c->dither, pkt->data);
+    caca_refresh_display(c->display);
+
+    return 0;
+}
+
+#define OFFSET(x) offsetof(CACAContext,x)
+
+static const AVOption options[] = {
+    { "window_title", "window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
+    { "driver",       "display driver", OFFSET(driver), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
+    { "algorithm",    "dithering algorithm", OFFSET(algorithm), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
+    { "antialias",    "antialias output", OFFSET(antialias), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
+    { "charset",      "charset used to render output", OFFSET(charset), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
+    { "colors",       "colors used to render output", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
+    { NULL },
+};
+
+static const AVClass caca_class = {
+    .class_name = "caca_outdev",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVOutputFormat ff_caca_muxer = {
+    .name           = "caca",
+    .long_name      = NULL_IF_CONFIG_SMALL("CACA output device"),
+    .priv_data_size = sizeof(CACAContext),
+    .audio_codec    = CODEC_ID_NONE,
+    .video_codec    = CODEC_ID_RAWVIDEO,
+    .write_header   = caca_write_header,
+    .write_packet   = caca_write_packet,
+    .write_trailer  = caca_write_trailer,
+    .flags          = AVFMT_NOFILE,
+    .priv_class     = &caca_class,
+};
-- 
1.7.7



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